Problem Topics
Difference between en3 and en4, changed 15,110 character(s)
Good Day to you!↵
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I've been asked to make some topic-wise list of problems I've solved. Even though I couldn't involve all problems, I've tried to involve at least "few" problems at each topic I thought up (I'm sorry if I forgot about something "easy"). I've alredy made such list once anyway I've tried to include more problems now — so here it is:↵
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<spoiler summary="aho">↵
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http://www.spoj.com/problems/ADAJOBS/↵
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http://www.spoj.com/problems/SUB_PROB/en/↵
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http://mirror.codeforces.com/contest/696/problem/D 8↵
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http://www.spoj.com/problems/AHOCUR/ 5 //Aho-Corassic + DP↵
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https://www.codechef.com/problems/LYRC (5) //Sample aho-brute-force↵
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http://mirror.codeforces.com/problemset/problem/346/B //Proposed by [user:bradyawn,2017-128-01-01]↵
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</spoiler>↵
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<spoiler summary="automat">↵
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6861 [LA] //CYK↵
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UVA 10679 //Suffix Automat↵
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http://www.spoj.com/problems/STRMATCH/ //Suffix Automat  &mdash; trie might do too↵
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http://www.spoj.com/problems/NSUBSTR2/ //Suffix Automaton↵
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</spoiler>↵
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<spoiler summary="belman-ford">↵
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UVA 12519↵
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http://www.spoj.com/problems/ARBITRAG/ (4) //Or Floyd-Warshall↵
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</spoiler>↵
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<spoiler summary="bfs">↵
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http://www.spoj.com/problems/ADACYCLE/ [FW]↵
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6151 &mdash; Beehives (4) //[NICE] //Search for shortest cycle↵
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https://devskill.com/CodingProblems/ViewProblem/60↵
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https://devskill.com/CodingProblems/ViewProblem/150↵
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11312 UVA (3)↵
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11392 UVA (4)↵
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http://mirror.codeforces.com/contest/653/problem/E (6)↵
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http://mirror.codeforces.com/contest/769/problem/C 5 //FL:ODD/**** | bfs+greed NICE↵
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10968 UVA (3) //EASY + NICE (bfs withot <=2 nodes)↵
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http://mirror.codeforces.com/contest/796/problem/D (3) //NICE+EASY ... print visited in bfs (not par)↵
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10888 UVA (4) //VERY NICE &mdash; but not main technique ... ++ DP /or/ MCMF↵
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http://mirror.codeforces.com/contest/821/problem/D (5) //VERY NICE &mdash; Consider only points not GRID↵
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http://www.spoj.com/problems/DIGOKEYS/ (4) //Easy [Nice problem &mdash; weird statement]↵
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http://www.spoj.com/problems/SPIKES/ (3) //Easy bfs (# of 's' * 2)↵
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http://www.spoj.com/problems/MULTII/ (4) //VERY NICE: BFS over numbers (K*10+d)%N↵
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http://www.spoj.com/problems/ADV04F1/ (5) //VERY NICE: [imple] ~ N^4*BigConstant↵
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http://www.spoj.com/problems/INVESORT/ (5) //Big limit (really usefull :P)↵
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http://mirror.codeforces.com/contest/59/problem/E (5) //[NICE][DOUBLE-STATES][SET]↵
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http://mirror.codeforces.com/contest/877/problem/D (4) //[NICE] Add vector to # of states↵
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</spoiler>↵
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<spoiler summary="bfs-grid">↵
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10977 UVA (3)↵
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928 UVA (3)↵
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13116 UVA (4)↵
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314 UVA (3)↵
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11487 UVA (4)↵
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5622 LA (7)↵
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11931 UVA (5)↵
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http://www.spoj.com/problems/KNMOVE/ 3 //simple knights↵
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http://www.spoj.com/problems/SERGRID/ 3 //almost classical↵
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http://www.spoj.com/problems/NAKANJ/ 3 //Classical chess &mdash; KNIGHT↵
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http://www.spoj.com/problems/PUCMM223/ (4) //NICE (but not many languages) &mdash; 2 moving [x][y]↵
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http://www.spoj.com/problems/SPIRALGR/ (4) //NICE (not typical) [SIEVE]↵
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http://www.spoj.com/problems/DCEPC706/ (4) //NICE &mdash; travelling outside↵
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http://mirror.codeforces.com/contest/35/problem/C (3) //No obstacles [multiple starts]↵
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</spoiler>↵
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<spoiler summary="big">↵
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https://devskill.com/CodingProblems/ViewProblem/394 (2) //Multiplication (or math)↵
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http://mirror.codeforces.com/contest/66/problem/A (2) //Big + iffs + implementation↵
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UVA &mdash; 10183 ↵
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10106 &mdash; Product [UVA]↵
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10523 &mdash; Very Easy !!! [UVA]↵
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787 &mdash; Maximum Sub-sequence Product [UVA]↵
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2871 &mdash; Rhyme Schemes [LA][BELL]↵
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UVA &mdash; 10497↵
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http://www.spoj.com/problems/MUL/en/↵
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http://www.spoj.com/problems/ITRIX_E/↵
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11115 &mdash; Uncle Jack↵
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11448 &mdash; Who said crisis? [UVA]↵
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http://www.spoj.com/problems/GCD2/↵
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10083 &mdash; Division [UVA]↵
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11830 &mdash; Contract Revision [UVA]↵
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1230 &mdash; MODEX [UVA]↵
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http://www.spoj.com/problems/NUMPLAY/↵
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10519 &mdash; UVA↵
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7651 &mdash; Pascal's Hyper-Pyramids [LA]↵
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11344 &mdash; The Huge One [UVA]↵
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10303 &mdash; How Many Trees? [UVA]↵
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http://www.spoj.com/problems/FAST2/↵
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495 &mdash; Fibonacci Freeze [UVA]↵
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10023 &mdash; Square root [UVA]↵
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http://www.spoj.com/problems/SKYLINE/↵
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http://www.spoj.com/problems/NITT2/↵
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11879 &mdash; Multiple of 17↵
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http://www.spoj.com/problems/MINNUM/↵
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10494 &mdash; If We Were a Child Again [UVA]↵
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10013 &mdash; Super long sums [UVA]↵
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10925 &mdash; Krakovia [UVA]↵
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10814 &mdash; Simplifying Fractions [UVA]↵
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619 &mdash; Numerically Speaking [UVA]↵
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713 &mdash; Adding Reversed Numbers [UVA]↵
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1226 &mdash; Numerical surprises [UVA]↵
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623 &mdash; 500! [UVA]↵
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http://mirror.codeforces.com/problemset/problem/18/D↵
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http://www.spoj.com/problems/NUMTSN/↵
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https://www.codechef.com/problems/FRJUMP↵
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10220 &mdash; I Love Big Numbers ! [UVA]↵
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https://www.hackerrank.com/contests/projecteuler/challenges/euler025↵
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https://www.hackerrank.com/contests/projecteuler/challenges/euler020↵
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11645 UVA 4↵
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Gym &mdash; 100866A [ACM ICPC 2005–2006 NEERC Moscow Subregional Contest]↵
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CSQUARE [SPOJ]↵
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http://www.spoj.com/problems/PARCARD1/↵
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10070 &mdash; Leap Year or Not Leap Year and .. [UVA]↵
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http://www.spoj.com/problems/SOLDIERS/↵
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12333 &mdash; Revenge of Fibonacci [UVA]↵
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http://www.spoj.com/problems/NDIVPHI/↵
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http://www.spoj.com/problems/IWGBS/ [UVA]↵
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http://www.spoj.com/problems/POP3/ [Prime-Test]↵
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http://www.spoj.com/problems/VGCD/↵
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http://www.spoj.com/problems/NDIVPHI2/↵
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12924 &mdash; Immortal Rabbits [UVA]↵
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Count the Trees  [UVA][10007]↵
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10198 &mdash; Counting [UVA]↵
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11375 UVA 3↵
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http://www.spoj.com/problems/MINNUM/ 3 // BIG/9+!!(BIG%9)↵
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10844 UVA 4 //Bell numbers + big (might be slightly slow!)↵
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http://www.spoj.com/problems/NITT2/ 2 //Divisibility by two constants↵
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http://www.spoj.com/problems/NUMPLAY/ (3) //With DP↵
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http://www.spoj.com/problems/IWGBS/ (3) //Fibonacci 10^4↵
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http://www.spoj.com/problems/PUCMM025/ (2) //Divisibility by 1 → 9↵
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http://www.spoj.com/problems/CSQUARE/ (3) //Converse + Power ↵
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http://mirror.codeforces.com/contest/17/problem/D (5) //B^(N-1)*(B-1)%C [B/N are big]↵
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</spoiler>↵
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<spoiler summary="binary_search">↵
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http://mirror.codeforces.com/contest/140/problem/C (4) //[NICE][GREEDY]↵
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http://mirror.codeforces.com/contest/898/problem/E (4) //[NICE][SIMPLE][PREPROCESS]↵
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http://mirror.codeforces.com/contest/888/problem/C (3) //Can be done without BS↵
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http://mirror.codeforces.com/contest/68/problem/B (3) //[EASY][DOUBLE]↵
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http://mirror.codeforces.com/contest/42/problem/A (2) //Or simple math↵
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http://mirror.codeforces.com/contest/883/problem/I (4) //[NICE][SET][2Pointers]↵
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http://mirror.codeforces.com/contest/51/problem/C (4) //[NICE][GREEDY-CHECK]↵
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http://mirror.codeforces.com/contest/729/problem/C 3↵
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http://mirror.codeforces.com/contest/714/problem/D 8↵
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13150 (UVA) 4↵
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http://mirror.codeforces.com/contest/749/problem/D 5↵
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11692 (UVA) 4↵
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11516 (UVA) 3↵
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http://mirror.codeforces.com/contest/760/problem/B 3↵
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http://mirror.codeforces.com/contest/675/problem/D 4 //dunno &mdash; solvable with treap↵
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http://www.spoj.com/problems/NDS/ 4 //BS over LIS↵
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http://www.spoj.com/problems/VECTAR4/ 3↵
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http://mirror.codeforces.com/contest/767/problem/D 4 //NICE↵
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http://mirror.codeforces.com/contest/627/problem/D (7) //with dp &mdash; NICE↵
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http://mirror.codeforces.com/contest/779/problem/D (3) //NICE + EASY↵
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http://www.spoj.com/problems/CNTINDX/ (4) //Map+BS === OK↵
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13177 UVA (3) //BS over answer == OK↵
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http://mirror.codeforces.com/contest/801/problem/C (3) //BS + SUM -EASY↵
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http://mirror.codeforces.com/contest/803/problem/D (3) //BS by answer↵
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http://mirror.codeforces.com/contest/807/problem/C (3) //Or math↵
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http://mirror.codeforces.com/contest/818/problem/F (4) //NICE &mdash; Live VS Clique↵
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http://mirror.codeforces.com/contest/845/problem/E (5) //VERY NICE &mdash; min(X,Y) .. add time, repeat↵
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http://www.spoj.com/problems/MATHLOVE/ (2) //BS + Gaus (or otter ways)↵
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http://www.spoj.com/problems/SABBIRGAME/ (3) //Binary search over answer ::max(0,ANS)↵
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http://mirror.codeforces.com/contest/846/problem/D (4) //BS+Precalculation OR 2D-RMQ↵
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http://www.spoj.com/problems/RPLC/ (3) //Classical↵
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http://www.spoj.com/problems/TRIGALGE/ (2) //On doubles &mdash; simple function given↵
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http://www.spoj.com/problems/ABA12E/ (4) //VERY NICE &mdash; BS on answer + 2Pointers↵
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http://mirror.codeforces.com/contest/847/problem/E (4) //NICE: Back+Front OR Front+Back↵
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http://www.spoj.com/problems/MAIN8_C/ (3) //Classical &mdash; simultion over array↵
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http://www.spoj.com/problems/FUNFACT/ (4) //VERY NICE &mdash; Sterling Approximation↵
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http://mirror.codeforces.com/contest/16/problem/C (3) //[or math][simple formula check]↵
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http://mirror.codeforces.com/contest/21/problem/C (3) //[NICE][prefix-sum+lower_bound]↵
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http://mirror.codeforces.com/contest/24/problem/E (5) //[doubles]↵
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http://mirror.codeforces.com/contest/875/problem/E (6) //VERY NICE [BS][Keep possible places]↵
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</spoiler>↵
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<spoiler summary="bits">↵
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http://mirror.codeforces.com/contest/879/problem/C (3) //[NICE] one of each operation is enough↵
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http://mirror.codeforces.com/contest/92/problem/B (2) //Bit addition/shifting (but big number)↵
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http://mirror.codeforces.com/contest/907/problem/C (3) //Nice but ugly statement: sets↵
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11659 UVA (4)↵
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11535 UVA (4)↵
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http://mirror.codeforces.com/contest/779/problem/E (5) //NICE + Parsing↵
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http://www.spoj.com/problems/EC_CONB/ (1) //reverse numbers↵
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http://mirror.codeforces.com/contest/769/problem/D (4) //freq + brute-force↵
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http://www.spoj.com/problems/HAP01/ (2) //builtin_popcount↵
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http://mirror.codeforces.com/contest/862/problem/C (3) //VERY NICE &mdash; Random works well↵
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http://www.spoj.com/problems/KOMPICI/ (4) //NICE &mdash; Bitmask over digits↵
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</spoiler>↵
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<spoiler summary="bitset">↵
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http://www.spoj.com/problems/ADACOINS/↵
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http://www.spoj.com/problems/ADACHERY/↵
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http://www.spoj.com/problems/ADAFUROW/↵
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http://mirror.codeforces.com/contest/117/problem/C (5) //Finding 3cycles in directed graph [NICE]↵
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http://mirror.codeforces.com/contest/754/problem/E 6↵
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http://www.spoj.com/problems/UCBINTC/ 5 //polymul with bitset↵
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http://mirror.codeforces.com/contest/33/problem/D (4) //VERY NICE [LCA works too]↵
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</spoiler>↵
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<spoiler summary="bridges">↵
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http://mirror.codeforces.com/contest/118/problem/E (4) //[NICE]//Orientation [+DFS]↵
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315 &mdash; Network↵
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796 &mdash; Critical Links↵
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UVA 12363↵
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Gym 100114J [2012-2013 ACM-ICPC, NEERC, Central Subregional Contest]↵
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http://www.spoj.com/problems/ONBRIDGE/ [ONLINE][HARD][NICE][D&C]↵
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http://mirror.codeforces.com/contest/732/problem/F 7↵
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http://mirror.codeforces.com/contest/700/problem/C 7↵
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http://www.spoj.com/problems/EC_P/ (3) //bridges ONLY↵
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http://www.spoj.com/problems/SUBMERGE/ (3) //Direct articulation↵
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http://www.spoj.com/problems/GRAFFDEF/ (5) //Bridge tree↵
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</spoiler>↵
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<spoiler summary="brute-force">↵
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http://mirror.codeforces.com/contest/146/problem/B (2) //Test all bigger numbers↵
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http://mirror.codeforces.com/contest/911/problem/B (1)↵
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7692 &mdash; Square Deal (4) //Permutations+Swap↵
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http://mirror.codeforces.com/contest/907/problem/A (2) //try all triples 0→ 200↵
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http://mirror.codeforces.com/contest/124/problem/B (3) //next-permutation↵
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http://mirror.codeforces.com/contest/910/problem/C (3) //Next-permutation↵
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http://mirror.codeforces.com/contest/898/problem/B (2) //Try all possibilities↵
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6160 &mdash; Countdown (5) //[NICE][DFS][EFFICIENT?]↵
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http://mirror.codeforces.com/contest/122/problem/C (3) //Just around 2^10 lucky [RECURSION]↵
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7899 &mdash; Mr. Panda and Strips (4) //Weak test-cases↵
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7671 What a Beautiful Lake (2) //Try up/down from every node↵
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http://mirror.codeforces.com/contest/110/problem/A (1) //4 or 7↵
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http://mirror.codeforces.com/contest/106/problem/B (2) //Cycles -_-↵
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http://mirror.codeforces.com/contest/895/problem/A (2) //All segments [in circle]↵
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http://mirror.codeforces.com/contest/893/problem/B (2) //Try each divisor↵
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http://mirror.codeforces.com/contest/894/problem/A (1) //3-cycles↵
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http://mirror.codeforces.com/contest/892/problem/C (3) //Try to find "1" ASAP↵
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http://mirror.codeforces.com/contest/102/problem/A (2) //Iterate over all triples↵
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http://mirror.codeforces.com/contest/96/problem/B (2) //Check all↵
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http://mirror.codeforces.com/contest/94/problem/B (1) //3cycles↵
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http://mirror.codeforces.com/contest/887/problem/B (3) //Test all numbers↵
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http://mirror.codeforces.com/gym/101597/problem/A (4) //[MATH][MODULO][SIMULATION]↵
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http://mirror.codeforces.com/contest/68/problem/C (5) //[VERY NICE][RECURSION][MAX COST MIN FLOW]↵
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http://mirror.codeforces.com/contest/68/problem/A (1) //Simple simulation↵
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http://mirror.codeforces.com/contest/66/problem/B (2) //Test always whole platform↵
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http://mirror.codeforces.com/contest/879/problem/C (3) //[NICE] one of each operation is enough↵
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http://mirror.codeforces.com/contest/46/problem/C (2) //[2pointers][N^2 works too]↵
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http://mirror.codeforces.com/contest/47/problem/D (4) //[Implementation][DFS]↵
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http://mirror.codeforces.com/contest/51/problem/D (4) //Check all/check without 1s/2nd↵
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http://code-festival-2017-qualc.contest.atcoder.jp/tasks/code_festival_2017_qualc_b (2)↵
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http://mirror.codeforces.com/contest/53/problem/B (3) //at most 60 possibilities↵
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http://mirror.codeforces.com/contest/55/problem/B (3) //Try all permutations & possibilities [NICE]↵
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http://mirror.codeforces.com/contest/877/problem/B (3) //NICE [N^2][PrefixSum]↵
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LA 6623 &mdash; Battle for Silver (3) //4 for-cycles inside ~ K4 search↵
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UVA 12169 (2)↵
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http://mirror.codeforces.com/contest/725/problem/C 4↵
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http://mirror.codeforces.com/contest/725/problem/E 6↵
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http://mirror.codeforces.com/contest/724/problem/B 3↵
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11961 UVA (2)↵
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11898 UVA (4)↵
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11659 UVA (4)↵
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http://mirror.codeforces.com/contest/753/problem/C 7↵
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11699 UVA (4)↵
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11548 UVA (3)↵
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11471 UVA (5) //With dynamic programming↵
↵
http://mirror.codeforces.com/contest/698/problem/D 8 //with geometry↵
↵
11206 UVA (6) //4^20 (but somehow passes)↵
↵
11214 UVA (6) //Úvaha + pruning↵
↵
11127 UVA (4) //Simple dfs [just realize you can do so]↵
↵
http://www.spoj.com/problems/BOKAM143SOU/ (3) //just implement for-cycles↵
↵
http://www.spoj.com/problems/BLOPER/ (4) dfs with little pruning↵
↵
13173 UVA (3) //just brute-force + branching↵
↵
http://mirror.codeforces.com/contest/799/problem/D (4) //VERY NICE [only top 34 needed] &mdash; trick with 2 [~20]↵
↵
10890 UVA (4) //Simple brute-force times out, but with simple pruning AC (answer detection↵
↵
http://mirror.codeforces.com/contest/813/problem/B (3) //All*All (BF) care for overflow! NICE & EASY↵
↵
http://mirror.codeforces.com/contest/817/problem/C (3) //Check S+Constant (NICE!)↵
↵
10732 UVA (2) //Brute-force passes .. just don't trust them O(N^2)↵
↵
10748 UVA (5) //VERY Nice (knights have K^2 moves not 8^K)↵
↵
http://mirror.codeforces.com/contest/818/problem/D (4) //NICE for each 'A' check all remaining (max SQRT)↵
↵
http://mirror.codeforces.com/contest/834/problem/E (5) //NICE &mdash; hard to imple: all 11122...999 OK↵
↵
http://www.spoj.com/problems/JHAGIRLS/ (4) //Efficient &mdash; or store output in array↵
↵
http://mirror.codeforces.com/contest/846/problem/B (3) //Brute-force↵
↵
http://www.spoj.com/problems/ALONE/ (4) //Generate everything <10^15 [NICE]↵
↵
http://mirror.codeforces.com/contest/861/problem/B (3) //Check all floor-sizes↵
↵
http://www.spoj.com/problems/RRANGE/ (3) //Compare all queries agains all updates + GAUSS↵
↵
http://mirror.codeforces.com/contest/598/problem/B (3) //Treap works too ;-)↵
↵
http://www.spoj.com/problems/AMR10I/ (4) //Can be solved with brute-force with dp↵
↵
http://mirror.codeforces.com/contest/868/problem/C (4) //Brute-force (fixet at most 6 each bits)↵
↵
http://mirror.codeforces.com/contest/868/problem/D (5) //NICE: Maximal K is low (I assumed 15)↵
↵
http://mirror.codeforces.com/contest/31/problem/C (2) //LOW-Constaints: N^2↵
↵
http://mirror.codeforces.com/contest/32/problem/D (3) //Simply try all possibilities↵
↵
http://mirror.codeforces.com/contest/876/problem/C (3) //Try N and ~100 lower↵
↵
http://mirror.codeforces.com/contest/44/problem/B (2) //N^2 works fine↵
↵
</spoiler>↵
↵
<spoiler summary="centroid">↵
↵
DCP-176: Motku2 [DevSkills] ↵
↵
http://mirror.codeforces.com/contest/715/problem/C 9↵
↵
http://mirror.codeforces.com/contest/741/problem/D 8↵
↵
13164 UVA (7)↵
↵
http://mirror.codeforces.com/contest/752/problem/F 5↵
↵
http://mirror.codeforces.com/contest/766/problem/E 6↵
↵
http://mirror.codeforces.com/contest/833/problem/D 7 //Very nice &mdash; hard (thinking + imple) + FW↵
↵
http://www.spoj.com/problems/HOLI/ (4) //VERY NICE: 2*Distances from centroids ↵
↵
</spoiler>↵
↵
<spoiler summary="coloring">↵
↵
http://mirror.codeforces.com/contest/741/problem/C 6↵
↵
11331 UVA (4)↵
↵
http://mirror.codeforces.com/contest/664/problem/D 4↵
↵
</spoiler>↵
↵
<spoiler summary="combinatorics">↵
↵
http://www.spoj.com/problems/ADATEAMS/↵
↵
http://www.spoj.com/problems/ADASUM/↵
↵
http://mirror.codeforces.com/contest/909/problem/B (3)↵
↵
http://mirror.codeforces.com/contest/131/problem/C (3) //[EASY][BRUTE-FORCE][COMB-NUMBERS]↵
↵
http://mirror.codeforces.com/contest/131/problem/B (2) //[EASY]↵
↵
http://mirror.codeforces.com/contest/129/problem/E (5) //[NICE][COMB-NUMBERS]//Observe↵
↵
http://mirror.codeforces.com/contest/111/problem/D (5) //[COMB-NUMBERS][POWER][VERY NICE][DP]↵
↵
http://mirror.codeforces.com/contest/895/problem/D (4) //[COMB-NUMBERS][OPTI]↵
↵
http://mirror.codeforces.com/contest/893/problem/E (5) //[COMB-NUMBERS][NUMBER-THEORY]↵
↵
http://mirror.codeforces.com/contest/894/problem/B (3) //try without last row↵
↵
http://mirror.codeforces.com/contest/890/problem/E (6) //Permutations↵
↵
http://mirror.codeforces.com/contest/52/problem/B (4) //[NICE][PREPROCESS][ROTATION]↵
↵
3917 //Grid tiling [fancy approximation fomula]↵
↵
http://mirror.codeforces.com/contest/760/problem/F↵
↵
https://devskill.com/CodingProblems/ViewProblem/61↵
↵
https://devskill.com/CodingProblems/ViewProblem/255↵
↵
UVA 10918↵
↵
UVA 12576↵
↵
UVA 1118 //Parity↵
↵
http://www.spoj.com/problems/HLP_RAMS/ //Comb parity↵
↵
Project Euler #78: Coin partitions //Partition function↵
↵
http://www.spoj.com/problems/MAIN75/ //DP #of trees↵
↵
12001 UVA (3)↵
↵
12034 UVA (4)↵
↵
11719 UVA (5)↵
↵
11798 UVA (5)↵
↵
11282 UVA (4) //dearrangement↵
↵
11174 UVA (4)↵
↵
http://mirror.codeforces.com/contest/666/problem/C 7↵
↵
http://www.spoj.com/problems/JOKER1/ 3 prod(Ai-i)↵
↵
http://www.spoj.com/problems/ANTP/ //4↵
↵
http://mirror.codeforces.com/contest/645/problem/E (5) //formula: A[i]=Sum(A)+1↵
↵
http://www.spoj.com/problems/SPCE/ (5) // N^{K-2}*Prod(comp_size)↵
↵
http://mirror.codeforces.com/contest/785/problem/D (5) // F'(' C"(+)-1","("↵
↵
13184 UVA (3)↵
↵
http://mirror.codeforces.com/contest/816/problem/D (5) // Observation↵
↵
13214 (4) //OEIS? : C(N+M-2,N-1)↵
↵
http://mirror.codeforces.com/contest/844/problem/B (2) //Easy &mdash; pro prvaky↵
↵
http://www.spoj.com/problems/JOSWAP/ (3) //Frequence array↵
↵
http://www.spoj.com/problems/UCV2013E/ (4) //NICE&EASY: Choose steps to direction↵
↵
http://www.spoj.com/problems/PARCARD1/ (4) //Partition function (raw)↵
↵
http://www.spoj.com/problems/GOODB/ (2) //Easy (NICE): Choose [order]↵
↵
http://www.spoj.com/problems/LOOPEXP/ (4) //A000254/N!↵
↵
http://www.spoj.com/problems/DTPOLY/ (5) //DP might work too↵
↵
http://www.spoj.com/problems/DTPOLY2/ (7) //Harder version of above (NICE but hell)↵
↵
http://www.spoj.com/problems/HC12/ (3) //NICE &mdash; Sort + C(i,K-1)*A[i]↵
↵
http://www.spoj.com/problems/STONE2/ (4) //NICE &mdash; Mostly DP [INVERSION][FACTORIAL]↵
↵
http://www.spoj.com/problems/MAIN8_D/ (5) //NICE &mdash; Suffixes/Prefixes (same add 2^i)↵
↵
http://www.spoj.com/problems/ITRIX_E/ (4) //VERY NICE &mdash; #Nonattacking 2-queens↵
↵
http://www.spoj.com/problems/MAXSUB/ (3) //NICE &mdash; Subsets made of zeroes↵
↵
http://www.spoj.com/problems/SKYLINE/ (3) //Catalan numbers [weird modulo &mdash; care]↵
↵
http://mirror.codeforces.com/contest/26/problem/D (5) //Division of two combintion numbers [NI:/]↵
↵
http://mirror.codeforces.com/contest/872/problem/E (6) // Prod:Sum(C(DistLines,CompSize))↵
↵
</spoiler>↵
↵
<spoiler summary="constructive">↵
↵
http://mirror.codeforces.com/contest/909/problem/F (6) //[VERY NICE][BITS]↵
↵
http://mirror.codeforces.com/contest/141/problem/C (4) //[NICE][BRUTE-FORCE]↵
↵
http://mirror.codeforces.com/contest/907/problem/D (5) //[VERY NICE][RANDOM]↵
↵
http://mirror.codeforces.com/contest/124/problem/C (3) //[NICE][SIEVE]↵
↵
http://mirror.codeforces.com/contest/125/problem/C (4) //[NICE][C(N,2)]↵
↵
http://mirror.codeforces.com/contest/902/problem/C (4) //[NICE]//Tree isomorphism↵
↵
http://mirror.codeforces.com/contest/112/problem/C (3) //[GREEDY]//Max + 1s↵
↵
http://mirror.codeforces.com/contest/110/problem/B (2) //Easy modulo↵
↵
http://mirror.codeforces.com/contest/894/problem/C (3) //[VERY NICE] //AiAiGCD↵
↵
http://mirror.codeforces.com/contest/97/problem/B (4) //NICE &mdash; Walls in middles [D&C]↵
↵
http://mirror.codeforces.com/contest/85/problem/A (3) //MODULO / SHIFT↵
↵
http://mirror.codeforces.com/contest/81/problem/D (3) //NICE &mdash; MAX(N/2) &mdash; even/odd↵
↵
http://mirror.codeforces.com/contest/63/problem/D (3) //NICE[GO BY LINES][4 WAYS B/D ODD/EVEN]↵
↵
http://mirror.codeforces.com/contest/42/problem/C (4) //Constructive works too but random is fine :)↵
↵
http://mirror.codeforces.com/contest/43/problem/D (3) //NICE &mdash; Easy to see [implementation]↵
↵
http://mirror.codeforces.com/contest/53/problem/C (2) //EASY [B/E Alternate]↵
↵
http://mirror.codeforces.com/contest/877/problem/C (3) //NICE 3*Alternative↵
↵
http://mirror.codeforces.com/contest/802/problem/H (6) //We can do "N+k" by adding a letter p+k*x+u+xx↵
↵
http://mirror.codeforces.com/contest/12/problem/E (5) //g[i][j]=1+(i+j)%(N-1) [+/-]↵
↵
http://mirror.codeforces.com/contest/22/problem/C (4) //Start and then clique without v (+ random)↵
↵
http://mirror.codeforces.com/contest/26/problem/C (5) //make Even*Even: do by 2*2 fields↵
↵
http://mirror.codeforces.com/contest/41/problem/E (4) //[NICE][CN/2,N/2]↵
↵
http://mirror.codeforces.com/contest/78/problem/B (2) //NICE &mdash; last 3 and then rest in modulo↵
↵
</spoiler>↵
↵
<spoiler summary="dfs">↵
↵
http://www.spoj.com/problems/ADASEA/http://mirror.codeforces.com/contest/109/problem/D (5) //[NICE][BACK-POINTERS][SIMULATION][SORT]↵
↵
</spoiler>↵
↵
<spoiler summary="dfs">↵
↵
http://www.spoj.com/problems/ADASEA/↵
↵
http://www.spoj.com/problems/CTTC/ (3) //[EASY][GRAPH-RECONSTRUCTION]↵
↵
7951 &mdash; Islands (3) //[NICE]Flood-Fill↵
↵
http://mirror.codeforces.com/contest/901/problem/D (7) //Observations / Tree reduction↵
↵
http://mirror.codeforces.com/contest/902/problem/B (3) //No dfs needed↵
↵
http://mirror.codeforces.com/gym/101630 {C}(4) //[NICE][SCC]↵
↵
http://mirror.codeforces.com/gym/101620 {J}(4) //DFS + multiples of divisors↵
↵
http://mirror.codeforces.com/contest/120/problem/F (3) //Width of tree↵
↵
7606 &mdash; Percolation (3) //Dfs on grid [EASY]↵
↵
http://mirror.codeforces.com/contest/116/problem/C (2) //[DEPTH]↵
↵
8080 &mdash; Christmas Tree (3) //[SIMPLE][NICE]↵
↵
6584 &mdash; Escape (8) //[VERY VERY VERY NICE][COMPRESSION][MERGING] //Hard but I recommend this one!!↵
↵
6590 Digraphs (4) //[VERY NICE][CYCLES][DP][IDEA]↵
↵
http://mirror.codeforces.com/contest/893/problem/C (3) //Minimum from each connected component↵
↵
http://mirror.codeforces.com/contest/884/problem/C (3) //[EASY][PERMUTATIONS][SORTING]↵
↵
http://mirror.codeforces.com/contest/883/problem/G (4) //Greedy picking↵
↵
http://mirror.codeforces.com/contest/60/problem/B (3) //3D Flood-Fill [NICE][EASY]↵
↵
http://mirror.codeforces.com/contest/60/problem/C (4) //[VERY NICE][BF]//Not many real possibilities↵
↵
https://devskill.com/CodingProblems/ViewProblem/3↵
↵
https://devskill.com/CodingProblems/ViewProblem/17↵
↵
https://devskill.com/CodingProblems/ViewProblem/118 //Kind-of↵
↵
657 &mdash; The die is cast [UVA]↵
↵
12186 UVA (3)↵
↵
http://mirror.codeforces.com/contest/734/problem/E (5)↵
↵
http://mirror.codeforces.com/contest/727/problem/A (3)↵
↵
http://mirror.codeforces.com/contest/723/problem/E (6)↵
↵
http://mirror.codeforces.com/contest/709/problem/E (6)↵
↵
http://mirror.codeforces.com/contest/710/problem/E (4)↵
↵
http://mirror.codeforces.com/contest/758/problem/E (8)↵
↵
11323 UVA (5)↵
↵
http://mirror.codeforces.com/contest/760/problem/B (3)↵
↵
http://mirror.codeforces.com/contest/761/problem/E (6)↵
↵
http://mirror.codeforces.com/contest/638/problem/B (3) //connect cons. letters↵
↵
http://mirror.codeforces.com/contest/638/problem/C (4) //greedy idea &mdash; easy↵
↵
http://mirror.codeforces.com/contest/638/problem/D (5) //spec-DAG articulatin↵
↵
http://mirror.codeforces.com/contest/767/problem/C (4) ↵
↵
http://mirror.codeforces.com/contest/781/problem/C (5)↵
↵
http://mirror.codeforces.com/contest/794/problem/D (5) //NICE! Right done dfs↵
↵
http://mirror.codeforces.com/contest/802/problem/K (5) //Slightly DP-like (NICE) TREE↵
↵
http://mirror.codeforces.com/contest/813/problem/C (3) //Simply 2 DFS: NICE + EASY↵
↵
http://mirror.codeforces.com/contest/841/problem/D (4) //DFS while tracking "next"↵
↵
http://mirror.codeforces.com/contest/845/problem/G (5) //Keep track of cycles↵
↵
http://mirror.codeforces.com/contest/844/problem/E (5) //Post-Order → line, Connect i → N-2: star↵
↵
http://www.spoj.com/problems/CAC/ (5) //VERY NICE! &mdash; Find all cycles in cactus↵
↵
http://mirror.codeforces.com/contest/849/problem/C (3) //State search by gauss↵
↵
http://mirror.codeforces.com/contest/846/problem/E (5) //NICE: DFS + some overflow logic↵
↵
http://www.spoj.com/problems/KOZE/ (3) //NICE: Floods↵
↵
http://www.spoj.com/problems/RIOI_2_3/ (4) //DFS /OR/ BFS /OR/ DSU [NICE][EASY][BF]↵
↵
http://www.spoj.com/problems/MAKEMAZE/ (3) //EASY &mdash; Simple dfs on grid ↵
↵
http://mirror.codeforces.com/contest/861/problem/F (5) //VERY NICE: Modify dfs tree so it remains connected↵
↵
http://www.spoj.com/problems/GHOSTS/ (3) //NICE &mdash; must remain dag after each QR↵
↵
http://www.spoj.com/problems/AMR10J/ (5) //VERY NICE! &mdash; DFS+DP [DAG with cycles]↵
↵
http://mirror.codeforces.com/contest/24/problem/A (2)//NICE [DFS-ON-CYCLE]↵
↵
http://mirror.codeforces.com/contest/29/problem/C (3) //Find begining/end of line (graph)↵
↵
http://mirror.codeforces.com/contest/29/problem/D (4) //Tree [implementation][simulation]↵
↵
</spoiler>↵
↵
<spoiler summary="digits">↵
↵
http://www.spoj.com/problems/PR003004/ (4) //Simple digits count↵
↵
http://mirror.codeforces.com/contest/770/problem/B (3) //max num max digsum↵
↵
</spoiler>↵
↵
<spoiler summary="dijkstra">↵
↵
http://www.spoj.com/problems/ADATRIP/↵
↵
http://mirror.codeforces.com/contest/144/problem/D (4) //[VERY NICE][IFS]↵
↵
http://www.spoj.com/problems/ADRABR/ (3) //Classical dijkstra &mdash; bad statement↵
↵
http://mirror.codeforces.com/contest/141/problem/D (5) //[NICE]Many Conditions↵
↵
6583 Subway (5) //[NICE]//Not exactly dijkstra by slightly similar [IMPLEMENTATION]↵
↵
3850 [LA]↵
↵
Gym 100625D [2013 Benelux Algorithm Programming Contest (BAPC 13)]↵
↵
UVA 12950↵
↵
Gym 100753A [2015 German Collegiate Programming Contest (GCPC 15) + POI 10-T3]↵
↵
UVA 13030↵
↵
UVA 1027↵
↵
UVA 11377↵
↵
http://mirror.codeforces.com/problemset/problem/843/D↵
↵
11813 UVA↵
↵
Gym 101242B [2016 ACM-ICPC World Finals] //+DP↵
↵
Gym 100923B [2015 ACM National Contest Romania &mdash; Round 1]↵
↵
UVA 11833↵
↵
http://www.spoj.com/problems/EZDIJKST/en/↵
↵
LightOJ 1019↵
↵
UVA 13010 //+TS↵
↵
2819 [LA]↵
↵
UVA 12144↵
↵
http://mirror.codeforces.com/contest/716/problem/D 7↵
↵
12047 UVA 4↵
↵
11514 UVA 4↵
↵
http://mirror.codeforces.com/contest/757/problem/F 7↵
↵
11338 UVA (4)↵
↵
11374 UVA (4)↵
↵
11097 UVA (4) //Divide to N*1000 nodes and go!↵
↵
13172 UVA (5) //6*DJ per query + permutations↵
↵
10816 UVA (4) //Easy Linear-Search by answer + DJ with path↵
↵
http://mirror.codeforces.com/contest/827/problem/F 7 //Very nice &mdash; Even&Odd  ↵
↵
http://www.spoj.com/problems/DELIVER/ (5) //Normalize coordinates + Optimalize↵
↵
http://www.spoj.com/problems/CCHESS/ (4) //Dijkstra as knight↵
↵
</spoiler>↵
↵
<spoiler summary="divide_conquer">↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/1683 (4) //RAW histogram↵
↵
http://mirror.codeforces.com/contest/817/problem/D (5) //Very nice NlogN↵
↵
http://www.spoj.com/problems/DYNACON2/ (8) //Lesser hell &mdash; offline Nlog(N) /or/ NlogN^2↵
↵
http://mirror.codeforces.com/contest/876/problem/F (5) //VERY NICE &mdash; Find greatest + next/back functions↵
↵
</spoiler>↵
↵
<spoiler summary="divisors">↵
↵
http://www.spoj.com/problems/FRNDAM/ (3) //Simply find sum of all divisors (low constraints)↵
↵
7726 A Simple Math Problem (4) //TLE if naive (consider only divisors)↵
↵
http://mirror.codeforces.com/contest/112/problem/D (4) //[NICE] Last-position [FACTOR]↵
↵
http://mirror.codeforces.com/contest/75/problem/C (3) //[NICE][BS]↵
↵
LightOJ 1068↵
↵
LightOJ 1134↵
↵
Project Euler #95: Amicable chains↵
↵
NAJ0001 &mdash; Divisible Number Sum [SPOJ]↵
↵
http://www.spoj.com/problems/LCMSUM/↵
↵
https://www.hackerrank.com/contests/101hack38/challenges/easy-gcd-1/problem↵
↵
UVA 13085↵
↵
http://www.spoj.com/problems/CDRSANJ/↵
↵
http://www.spoj.com/problems/DIVSEQ/↵
↵
UVA 12154↵
↵
UVA 13058↵
↵
http://www.spoj.com/problems/EC_DIVS/↵
↵
https://www.codechef.com/problems/CHEFKEY↵
↵
http://mirror.codeforces.com/problemset/problem/671/C↵
↵
Gym 101411G  [2009-2010 ACM-ICPC, NEERC, Western Subregional Contest]↵
↵
http://mirror.codeforces.com/problemset/problem/831/F↵
↵
http://mirror.codeforces.com/problemset/problem/839/D↵
↵
12934 &mdash; Factorial Division [UVA]↵
↵
UVA 10880↵
↵
http://www.spoj.com/problems/PSTR/↵
↵
http://mirror.codeforces.com/problemset/problem/27/E↵
↵
[LA] 3014↵
↵
UVA 12843↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/1164↵
↵
http://mirror.codeforces.com/problemset/problem/803/F↵
↵
10892 &mdash; LCM Cardinality↵
↵
http://www.spoj.com/problems/GCDEX/↵
↵
http://www.spoj.com/problems/INVDIV/↵
↵
13083 &mdash; Yet another GCDSUM //ll↵
↵
http://www.spoj.com/problems/IITKWPCF/ //ll↵
↵
UVA 13185↵
↵
UVA 13194↵
↵
UVA 11388↵
↵
http://www.spoj.com/problems/SAS002/↵
↵
12425 &mdash; Best Friend↵
↵
http://mirror.codeforces.com/problemset/problem/703/E↵
↵
https://www.hackerearth.com/problem/algorithm/harry-gets-into-infy/↵
↵
UVA 10830 //SUM↵
↵
http://www.spoj.com/problems/DIVSUM/en/ //SUM↵
↵
http://www.spoj.com/problems/AFS/ //SUM↵
↵
UVA 11526 //SUM↵
↵
</spoiler>↵
↵
<spoiler summary="dp">↵
↵
http://www.spoj.com/problems/ADAZOO/↵
↵
http://www.spoj.com/problems/ADASEQEN/↵
↵
http://www.spoj.com/problems/ADAMOLD/↵
↵
http://www.spoj.com/problems/ADASALE/↵
↵
http://mirror.codeforces.com/contest/146/problem/E (5) //[NICE][COMBINATORICS][OBSERVATION]↵
↵
http://mirror.codeforces.com/contest/909/problem/C (4) //[NICE][CLASSICAL][EASY]↵
↵
7785 &mdash; m-ary Partitions (4) //Combinatorics↵
↵
http://mirror.codeforces.com/contest/133/problem/E (4) //[IMPLEMENTATION]↵
↵
http://mirror.codeforces.com/contest/126/problem/D (5) //[NICE]//Decomposet DP//Own hash-map↵
↵
http://mirror.codeforces.com/contest/910/problem/B (3) //Or many other ways↵
↵
6154 RNA Secondary Structure (5) //[NICE] Unoptimal might work too↵
↵
https://arc087.contest.atcoder.jp/tasks/arc087_b (4) //[VERY NICE][OBSERVATION]↵
↵
http://mirror.codeforces.com/contest/903/problem/F (5) //[VERY NICE][BITMASK][BRUTE]↵
↵
http://mirror.codeforces.com/contest/903/problem/A (2) //Easy knapsack-like // Low constraints↵
↵
http://mirror.codeforces.com/contest/900/problem/E (4) //[NICE]//Patter-match: FFT or KMP or Brute-Force↵
↵
http://mirror.codeforces.com/contest/118/problem/D (3) //[COMBINATORICS][LOW-CONSTRAINTS]↵
↵
http://mirror.codeforces.com/contest/115/problem/E (5) //[VERY NICE][SEGMENT TREE]↵
↵
http://mirror.codeforces.com/contest/116/problem/D (3) //CLASSICAL[LOW-CONSTRAINTS]↵
↵
10128 Queue (uva) (4) //One possibility is bitmask &mdash; second combinatorics↵
↵
http://mirror.codeforces.com/contest/110/problem/C (3) //[EASY]// Greedy/math works too↵
↵
8078 &mdash; Bracket Sequence (4) //[VERY NICE][DP-LINKS]↵
↵
http://mirror.codeforces.com/contest/106/problem/C (3) //[NICE][EASY]↵
↵
http://mirror.codeforces.com/contest/895/problem/C (4) //[NICE]↵
↵
8024 Stack Construction (4) //[NICE] Palindromic style &mdash; but not exactly↵
↵
7708 &mdash; Cubes (6) //[MATH]↵
↵
http://mirror.codeforces.com/contest/888/problem/F (6) //[NICE][FLAG]↵
↵
http://www.spoj.com/problems/ACQUIRE/ (5) //[NICE][CH-OPT]↵
↵
http://mirror.codeforces.com/contest/319/problem/C (6) //[NICE][CH-OPT]↵
↵
http://www.spoj.com/problems/NKLEAVES/ (5) //[NICE][DC]↵
↵
http://mirror.codeforces.com/contest/76/problem/D (4) //[BITS][OVERFLOW]↵
↵
http://mirror.codeforces.com/contest/73/problem/C (4) //[NICE][EASY][TRY-ALL-LETTERS]↵
↵
http://mirror.codeforces.com/contest/67/problem/C (4) //[NICE][LEAVENSTEIN]↵
↵
http://mirror.codeforces.com/contest/67/problem/A (3) //[EASY][PRINTING][OTHER POSSIBLE WAYS]↵
↵
http://mirror.codeforces.com/contest/55/problem/D (5) //[NICE][DIGITS][EFFICIENT]↵
↵
http://mirror.codeforces.com/contest/56/problem/D (4) //String modification + printing [NICE]↵
↵
http://mirror.codeforces.com/contest/58/problem/E (6) //[NICE][IMPLEMENTATION]↵
↵
UVA 12181↵
↵
https://devskill.com/CodingProblems/ViewProblem/21↵
↵
https://devskill.com/CodingProblems/ViewProblem/37↵
↵
https://devskill.com/CodingProblems/ViewProblem/71↵
↵
https://devskill.com/CodingProblems/ViewProblem/103↵
↵
https://devskill.com/CodingProblems/ViewProblem/107↵
↵
https://devskill.com/CodingProblems/ViewProblem/115↵
↵
https://devskill.com/CodingProblems/ViewProblem/126↵
↵
https://devskill.com/CodingProblems/ViewProblem/131↵
↵
https://devskill.com/CodingProblems/ViewProblem/134↵
↵
https://devskill.com/CodingProblems/ViewProblem/174↵
↵
https://devskill.com/CodingProblems/ViewProblem/186↵
↵
https://devskill.com/CodingProblems/ViewProblem/201↵
↵
https://devskill.com/CodingProblems/ViewProblem/338↵
↵
https://devskill.com/CodingProblems/ViewProblem/368↵
↵
https://devskill.com/CodingProblems/ViewProblem/392↵
↵
https://devskill.com/CodingProblems/ViewProblem/399↵
↵
https://www.hackerrank.com/contests/world-codesprint-5/challenges/mining //Opti↵
↵
UVA 12915 //Opti↵
↵
UVA 12524 //Opti↵
↵
http://mirror.codeforces.com/problemset/problem/631/E //CH↵
↵
https://devskill.com/CodingProblems/ViewProblem/6↵
↵
https://devskill.com/CodingProblems/ViewProblem/11↵
↵
11552 UVA (3)↵
↵
12172 UVA (3)↵
↵
4507 LA (5)↵
↵
4510 LA (5) [+ geometry]↵
↵
12181 UVA (6)↵
↵
http://mirror.codeforces.com/contest/729/problem/F 6↵
↵
http://mirror.codeforces.com/contest/735/problem/E 9↵
↵
http://mirror.codeforces.com/contest/731/problem/E 5↵
↵
12030 UVA (4)↵
↵
http://mirror.codeforces.com/contest/721/problem/E 7↵
↵
http://mirror.codeforces.com/contest/742/problem/D 4↵
↵
12040 UVA (5)↵
↵
http://mirror.codeforces.com/contest/712/problem/D 5↵
↵
13162 UVA (6)↵
↵
http://mirror.codeforces.com/contest/743/problem/E 6↵
↵
11908 UVA (3)↵
↵
11932 UVA (4)↵
↵
http://mirror.codeforces.com/contest/745/problem/E (7)↵
↵
11806 UVA (4)↵
↵
http://mirror.codeforces.com/contest/747/problem/F (5)↵
↵
11843 UVA (4)↵
↵
http://mirror.codeforces.com/contest/752/problem/E (5)↵
↵
http://mirror.codeforces.com/contest/703/problem/E (7)↵
↵
11753 UVA (4)↵
↵
11725 UVA (5)↵
↵
http://mirror.codeforces.com/contest/722/problem/E (9)↵
↵
http://mirror.codeforces.com/contest/760/problem/F (8)↵
↵
11795 UVA (3)↵
↵
11654 UVA (4)↵
↵
11523 UVA (5)↵
↵
11404 UVA (4)↵
↵
11432 UVA (4)↵
↵
11451 UVA (4) //C==20 mistake in statement↵
↵
11301 UVA (4)↵
↵
http://mirror.codeforces.com/contest/762/problem/D 5↵
↵
11361 UVA (4) //digit DP↵
↵
11365 UVA (7)↵
↵
11391 UVA (4) //easy+implementation↵
↵
11394 UVA (3)↵
↵
11218 UVA (2)↵
↵
11125 UVA (4) //slightly implementation↵
↵
11076 UVA (3)↵
↵
11081 UVA (4) //3 string subsequences (beware of fail)↵
↵
http://mirror.codeforces.com/contest/678/problem/E (5) //bitset dp + probability↵
↵
http://mirror.codeforces.com/contest/766/problem/C (4)↵
↵
http://mirror.codeforces.com/contest/667/problem/C (3)↵
↵
http://www.spoj.com/problems/MOVIFAN/ (3)↵
↵
http://www.spoj.com/problems/ORDSUM23/ (3)↵
↵
http://www.spoj.com/problems/DIVSEQ/ (4) //N^3 (but better...) works fine↵
↵
http://mirror.codeforces.com/contest/633/problem/F (7) //Tree dp↵
↵
http://www.spoj.com/problems/ADJDUCKS/ (4) sort + pick 2-3 continous O(N)↵
↵
http://www.spoj.com/problems/JLNT/ (4) //pick 0 or 2 | 1e3*5e3↵
↵
http://www.spoj.com/problems/TPCPALIN/ (5) //500^3 works (3rd countable)↵
↵
http://www.spoj.com/problems/COLORSEG/ (4) //50^4==OK 50^4log(N)=TLE NICE↵
↵
http://www.spoj.com/problems/POWERCAR/ (3) //1e3*1e3*2 &mdash; follow rules↵
↵
http://www.spoj.com/problems/INGRED/ (5) //TSP-like [reduce + go]↵
↵
http://www.spoj.com/problems/BADXOR/ (4) //classical subsets↵
↵
http://www.spoj.com/problems/SPCO/ (5) //64*64*2 DP {OPT: prime O(1) + clear only half}↵
↵
http://www.spoj.com/problems/WAYHOME/ (5) //NICE: 1) 1*1 b)12,1,**,2↵
↵
http://www.spoj.com/problems/NFURY/ (2) //Minimal sum of squares↵
↵
http://www.spoj.com/problems/GDIL/ (3) //combinatorics↵
↵
http://mirror.codeforces.com/contest/791/problem/D (5) //Tree↵
↵
http://mirror.codeforces.com/contest/791/problem/E (6) //V,K,X &mdash; pick any↵
↵
http://mirror.codeforces.com/contest/789/problem/C (3)↵
↵
13176 (4) //N^6↵
↵
13179 (5) //NICE [Ath][Bth][TimeDiff]↵
↵
http://mirror.codeforces.com/contest/796/problem/E (6) //NICE: N*P*K*K (WC can't happen!)↵
↵
http://mirror.codeforces.com/contest/797/problem/E (4) //NICE: Almost BF-able (but care of low K)↵
↵
http://mirror.codeforces.com/contest/793/problem/D (3) //NICE & EASY: begin/end/actual/USED↵
↵
http://mirror.codeforces.com/contest/803/problem/E (4) //State search &mdash; many IF's (EASY)↵
↵
http://mirror.codeforces.com/contest/805/problem/F (7) //NICE: DP on tree + fast BF + hack↵
↵
http://mirror.codeforces.com/contest/808/problem/E (5) //NICE!↵
↵
http://mirror.codeforces.com/contest/811/problem/C (4) //Precalculate + DP (greedy thinking)↵
↵
10817 UVA 4 //Easy but slightly implementation↵
↵
10859 UVA 4 //Nice &mdash; on tree .. but for a reason small constrains↵
↵
10898 UVA 4 //Hash is lesser than 1e6 .. try everything↵
↵
http://mirror.codeforces.com/contest/812/problem/B (3) //Not only DP, yet imho easiest ..many spec cases↵
↵
http://mirror.codeforces.com/contest/813/problem/D (5) //VERY VERY NICE &mdash; N*N (none picked between a/b)↵
↵
http://mirror.codeforces.com/contest/814/problem/E 5 //VERY NICE &mdash; Harder imple: Combinatorics↵
↵
http://mirror.codeforces.com/problemset/problem/816/E (6) //NICE &mdash; Tree (hard 2C complexity)↵
↵
http://mirror.codeforces.com/contest/837/problem/D (5) //NICE &mdash; yet kinda pain [must be iterative]↵
↵
http://www.spoj.com/problems/AUT/ (4) //NICE &mdash; K is interesting ~ at most 1600↵
↵
http://www.spoj.com/problems/GNYR04C/ (3) //Easy &mdash; Nice idea [Big→ Low approach]↵
↵
http://www.spoj.com/problems/TIEROPE/ (4) //Process 2*L ~ otherwise pick BIG↵
↵
http://www.spoj.com/problems/IITKWPCE/ (4) //Palindromes [efficiency!] &mdash; NICE!↵
↵
IITKWPCD SPOJ (4) //+Slightly geometry ↵
↵
UVA 1496 //[Steiner's Tree] Very Nice (8)↵
↵
http://www.spoj.com/problems/LKS/ (3) //Classical knapsack↵
↵
http://www.spoj.com/problems/UOFTAE/ (3) //Easy & Sympatic DP↵
↵
http://www.spoj.com/problems/DCOWS/ (4) //Very NICE (sort + GO)↵
↵
http://www.spoj.com/problems/FARIDA/ (3) //Easy & Sympatic ((u+1) | Price+(u+2))↵
↵
http://www.spoj.com/problems/AU7_5/ (2) //EASY: dyn(n-1)+dyn(n-k-1)↵
↵
http://www.spoj.com/problems/NAIVELOK/ (4) //NICE [depalindromisation] ↵
↵
http://mirror.codeforces.com/contest/846/problem/C (4) //With print↵
↵
http://www.spoj.com/problems/CNT_LUCK/ (4) //Number (binary) dp [NICE] {ull care 0-1}↵
↵
http://www.spoj.com/problems/MAY99_4/ (3) //Almost combinatoric Sub and 0/1,1/0↵
↵
http://www.spoj.com/problems/GEEKOUNT/ (4) //Number dp↵
↵
http://www.spoj.com/problems/MUTDNA/ (4) // N*2 (turned?) [not sure if grd poss.]↵
↵
http://www.spoj.com/problems/RIOI_3_2/ (5) //VERY NICE (easy imple &mdash; Number Theory thinking)↵
↵
http://www.spoj.com/problems/MAXWOODS/ (3) //NICE [EASY][GRID]↵
↵
http://www.spoj.com/problems/DIEHARD/ (3) //Easy &mdash; prolly solvable by greedy (but dp is easier)↵
↵
http://www.spoj.com/problems/DCEPC810/ (4) //VERY VERY NICE &mdash; Subsequence 2pointers+2bools↵
↵
http://www.spoj.com/problems/EQ2/ (4) //NICE: Digit + Carry (from back) &mdash; iff-party↵
↵
http://www.spoj.com/problems/DCEPC501/ (3) //NICE & EASY↵
↵
http://www.spoj.com/problems/NUMTSN/ (4) //NICE &mdash; Thinking or Opti↵
↵
http://www.spoj.com/problems/GONE/ (4) //NICE & EASY [digits]↵
↵
http://www.spoj.com/problems/RAONE/ (4) //NICE & EASY [digits] &mdash; almost similar as above↵
↵
http://www.spoj.com/problems/STRSEQ/ (4) //VERY VERY NICE &mdash; Next-Function↵
↵
http://www.spoj.com/problems/MYQ8/ (4) //VERY NICE &mdash; 3x3 tic-tac-toe [implementation]↵
↵
http://mirror.codeforces.com/contest/859/problem/C (3) //Easy+Sympathic [PrefixSumOptional]↵
↵
http://mirror.codeforces.com/contest/859/problem/D (4) //NICE [Probabilities]↵
↵
http://www.spoj.com/problems/UNICA/ (4) //VERY NICE [Posibilities][Print][Classical]↵
↵
http://www.spoj.com/problems/KOPC12H/ (4) //NICE Digit-DP↵
↵
http://www.spoj.com/problems/DRACULA/ (4) //NICE Digit-DP (Both sides) &mdash; iterate by sum↵
↵
http://www.spoj.com/problems/ABCPATH/ (3) //DP over dfs (maybe without dp works too?)↵
↵
http://www.spoj.com/problems/BEHAPPY/ (2) //Easy one &mdash; low constraints↵
↵
http://www.spoj.com/problems/STRCOUNT/ (4) //No input (over bits)↵
↵
http://mirror.codeforces.com/contest/855/problem/B (2) //prolly not even necessary↵
↵
http://mirror.codeforces.com/contest/855/problem/C (4) //dp on tree↵
↵
http://mirror.codeforces.com/contest/855/problem/E (5) //VERY NICE &mdash; Digits & Bitmask & Query (learning!)↵
↵
http://www.spoj.com/problems/PAINTWAL/ (6) //VERY NICE &mdash; Imho hard (opti could beat)↵
↵
http://www.spoj.com/problems/ADFRUITS/ (3) //Very simple (substring == subsequence)↵
↵
http://www.spoj.com/problems/MAIN113/ (2) //NICE but somehow too low constraints↵
↵
http://www.spoj.com/problems/MAIN112/ (4) //NICE &mdash; Bitmask ↵
↵
http://mirror.codeforces.com/contest/864/problem/E (5) //VERY NICE &mdash; Sort ↵
↵
http://www.spoj.com/problems/NOVICE63/ (4) //NICE -On digits (binary)↵
↵
http://www.spoj.com/problems/TUG/ (3) //NICE + Observation {N>100 == YES}↵
↵
http://www.spoj.com/problems/DOMINO1/ (4) //Used map to solve it↵
↵
http://www.spoj.com/problems/NY10E/ (2) //Easy dp↵
↵
http://www.spoj.com/problems/MAIN72/ (3) //Easy knapsack↵
↵
http://www.spoj.com/problems/NOVICE43/ (2) //Unbelievably low constraints↵
↵
http://mirror.codeforces.com/contest/598/problem/E (4) //N^5 strategy works fine [VERY NICE]↵
↵
http://www.spoj.com/problems/CHAIR/ (3) //Maybe combinatorics too?↵
↵
http://www.spoj.com/problems/ACPC10D/ (3) //NICE &mdash; DAG traversal↵
↵
http://www.spoj.com/problems/CPCRC1C/ (4) //Digits dp (return pair)↵
↵
http://www.spoj.com/problems/BORW/ (3) //Inc+Dec sequence (small array)↵
↵
http://mirror.codeforces.com/problemset/problem/16/E (5) //Bitmask [NICE]↵
↵
http://mirror.codeforces.com/problemset/problem/18/E (5) //VERY NICE {no need for second iteration}↵
↵
http://mirror.codeforces.com/contest/2/problem/B (5) //NICE &mdash; 2/5 are in-fact independent↵
↵
http://mirror.codeforces.com/contest/4/problem/D (3) //Classical [FW works too] XY > xy↵
↵
http://mirror.codeforces.com/contest/6/problem/D (4) //NICE (N^4)↵
↵
http://mirror.codeforces.com/contest/321/problem/E (7) //VERY NICE &mdash; D&C Trick↵
↵
http://mirror.codeforces.com/contest/868/problem/F (8) //VERY VERY NICE  D&C Trick &mdash; With MO Principal↵
↵
http://mirror.codeforces.com/contest/8/problem/C (5) //NICE &mdash; Masks [N*2^N]↵
↵
http://mirror.codeforces.com/contest/868/problem/E (8) //VERY NICE &mdash; HARD &mdash; on tree↵
↵
http://mirror.codeforces.com/contest/10/problem/D (4) //LCIS [NICE]↵
↵
http://mirror.codeforces.com/contest/13/problem/C (5) //NICE [sorting][only elements from array]↵
↵
http://mirror.codeforces.com/contest/17/problem/C (5) //[NICE][iterative-sparse][+idea]↵
↵
http://mirror.codeforces.com/contest/19/problem/B (4) //Knapsack (after good look)↵
↵
http://mirror.codeforces.com/contest/30/problem/C (4) //Probabilities + (slight)GEO↵
↵
http://mirror.codeforces.com/contest/31/problem/E (4) //[NICE]↵
↵
http://mirror.codeforces.com/contest/41/problem/D (4) //With printing↵
↵
</spoiler>↵
↵
<spoiler summary="dsu">↵
↵
http://www.spoj.com/problems/ADABRANC/↵
↵
http://mirror.codeforces.com/contest/141/problem/E (6) //[NICE][SPANNIG TREE]↵
↵
7903 &mdash; Pandaria (7) //[VERY NICE][DSU][SORTING][MERGE][DFS]↵
↵
http://mirror.codeforces.com/contest/110/problem/E (4) //[NICE][COMBINATORICS][TREE]↵
↵
http://mirror.codeforces.com/contest/90/problem/E (5) //[NICE][DSU-LIKE-LINKS][SIMULATION]↵
↵
http://mirror.codeforces.com/contest/87/problem/D (5) //[VERY NICE][SORTING][COMPRES][DFS]↵
↵
http://mirror.codeforces.com/contest/884/problem/E (5) //[VERY NICE][MEMORY SPARSE]↵
↵
http://mirror.codeforces.com/contest/60/problem/D (6) //[NICE][Pythagorean Triples][Gen over max!]↵
↵
UVA 10947↵
↵
UVA 12363↵
↵
LA 3833 ↵
↵
http://mirror.codeforces.com/problemset/problem/742/D  //+DP↵
↵
UVA 10178↵
↵
http://mirror.codeforces.com/contest/723/problem/F 7↵
↵
13153 UVA (5)↵
↵
13169 UVA (3)↵
↵
11987 UVA (3)↵
↵
11474 UVA (4)↵
↵
http://www.spoj.com/problems/BTCODE_G/↵
↵
http://mirror.codeforces.com/problemset/problem/691/D↵
↵
Gym 101174K [2016-2017 ACM-ICPC Southwestern European Regional Programming Contest (SWERC 2016)]↵
↵
UVA 10583↵
↵
LightOJ 1003↵
↵
http://mirror.codeforces.com/problemset/problem/731/C↵
↵
UVA 793 ↵
↵
UVA 11966↵
↵
https://www.codechef.com/problems/COZIC↵
↵
3939 [LA]↵
↵
UVA 11503↵
↵
http://mirror.codeforces.com/problemset/problem/755/C↵
↵
UVA 1395↵
↵
http://mirror.codeforces.com/contest/687/problem/D 6↵
↵
http://mirror.codeforces.com/contest/680/problem/E 7 //+precalculation/brute force↵
↵
http://mirror.codeforces.com/contest/766/problem/D 5↵
↵
http://www.spoj.com/problems/LEXSTR/ (3) //Nice na stringu↵
↵
http://mirror.codeforces.com/contest/805/problem/C 3 //NICE (dijkstra like :P)↵
↵
http://www.spoj.com/problems/IITKWPCI/ (3) //VERY NICE ↵
↵
http://www.spoj.com/problems/FRNDCIRC (3) //Classical DSU (NICE for practice)↵
↵
http://www.spoj.com/problems/FOXLINGS/ (3) Easy &mdash; just renumbering↵
↵
http://www.spoj.com/problems/NITTROAD/ (4) //Process from back↵
↵
http://www.spoj.com/problems/SHAHBG/ (2) //DSU not needes (simulated by array)↵
↵
http://mirror.codeforces.com/contest/598/problem/D (3) //Can be solved with DFS too↵
↵
http://mirror.codeforces.com/contest/9/problem/E (4) //Making one big cycle↵
↵
http://mirror.codeforces.com/contest/25/problem/D (4) //Could be done linear too↵
↵
http://mirror.codeforces.com/contest/28/problem/B (4) //NICE [imho bad statement]↵
↵
http://mirror.codeforces.com/contest/876/problem/D (4) //DSU adjacent + visited↵
↵
http://mirror.codeforces.com/contest/875/problem/F (6) //NICE &mdash; Maximum cactus-forest [kruskal-like]↵
↵
</spoiler>↵
↵
<spoiler summary="euler_function">↵
↵
http://mirror.codeforces.com/contest/907/problem/F (7) //[MAGIC]↵
↵
UVA 10299↵
↵
UVA 10990↵
↵
https://www.codechef.com/problems/SMPLSUM↵
↵
https://www.codechef.com/problems/COZIE↵
↵
http://www.spoj.com/problems/LCMSUM/↵
↵
Gym 100975F [2003-2004 Petrozavodsk Summer Training Camp, Saratov SU Contest]↵
↵
UVA 13132↵
↵
http://www.spoj.com/problems/GCDEX/↵
↵
UVA 12995↵
↵
http://www.spoj.com/problems/TIP1/↵
↵
UVA 11327↵
↵
LightOJ 1007↵
↵
http://www.spoj.com/problems/ETF/↵
↵
Project Euler #72: Counting fractions↵
↵
http://www.spoj.com/problems/DCEPCA03/↵
↵
http://www.spoj.com/problems/NAJPWG/ 4 //Gauss-Euler↵
↵
http://www.spoj.com/problems/DCEPC12G/ (5) //Do what is written there↵
↵
http://www.spoj.com/problems/INVPHI/ (5) //Inverse euler↵
↵
</spoiler>↵
↵
<spoiler summary="euler_tour">↵
↵
13246 &mdash; Chained Words (4) //[NICE][LEXICOGRAPHICAL]↵
↵
UVA 10735↵
↵
http://mirror.codeforces.com/contest/789/problem/D //Adj EG + Self/everything↵
↵
http://mirror.codeforces.com/contest/21/problem/D (5) //[NICE][EulerTour+DP]↵
↵
http://mirror.codeforces.com/contest/36/problem/E (6) //VERY NICE [4odd is hardest]↵
↵
</spoiler>↵
↵
<spoiler summary="factorization">↵
↵
http://www.spoj.com/problems/ADAHW/ [RHO][Number Theory]↵
↵
http://www.spoj.com/problems/ADADIGIT/ [Permutations]↵
↵
UVA 13067↵
↵
Project Euler #108: Diophantine reciprocals I↵
↵
http://www.spoj.com/problems/CHGROOM/↵
↵
Gym 101370A [2009-2010 Summer Petrozavodsk Camp, Petr Mitrichev Contest 5]↵
↵
http://mirror.codeforces.com/problemset/problem/837/E↵
↵
http://www.spoj.com/problems/PSYCHOT/↵
↵
http://www.spoj.com/problems/FACTDIV/↵
↵
http://www.spoj.com/problems/NOSQ/↵
↵
http://www.spoj.com/problems/FCDC/↵
↵
http://www.spoj.com/problems/NFACTOR/↵
↵
http://www.spoj.com/problems/ABA12D/↵
↵
http://www.spoj.com/problems/PSTR/↵
↵
http://www.spoj.com/problems/AMR11E/↵
↵
http://www.spoj.com/problems/FACT1/↵
↵
http://www.spoj.com/problems/FACT2/↵
↵
https://www.hackerearth.com/problem/algorithm/gold-at-lolympics/↵
↵
12005 UVA (7)↵
↵
12062 UVA (6)↵
↵
11960 UVA (3)↵
↵
http://www.spoj.com/problems/FACTCG2/ (3)↵
↵
http://www.spoj.com/problems/FACT0/ (4)↵
↵
http://mirror.codeforces.com/contest/546/problem/D 5↵
↵
http://mirror.codeforces.com/contest/222/problem/C 6↵
↵
http://www.spoj.com/problems/COMDIV/ 3↵
↵
http://www.spoj.com/problems/SINEGGS/ 3↵
↵
http://www.spoj.com/problems/BDOI16B/ 4↵
↵
http://www.spoj.com/problems/HG/ 4 //Map == OK↵
↵
11099 UVA (3) //factor + recursion↵
↵
13194 UVA (3) //factorize+generate /or just check↵
↵
13191 UVA (6) //Pollard-Rho↵
↵
http://mirror.codeforces.com/contest/818/problem/E (4) // Efficient + Two Pointers↵
↵
http://mirror.codeforces.com/contest/831/problem/F (6) //MAGIC↵
↵
http://mirror.codeforces.com/contest/839/problem/D (4) // Combinatorics + IE↵
↵
http://www.spoj.com/problems/SAS002/ (5) //Find all divisors (big numbers)↵
↵
http://www.spoj.com/problems/GCDS/ (4) //Lowest unused prime↵
↵
http://www.spoj.com/problems/IITKWPCF/ (4) //Nonprime divisors of N/2↵
↵
http://mirror.codeforces.com/contest/851/problem/D (4) //Properties of GCD + factor: NICE↵
↵
http://www.spoj.com/problems/PTIME/ (3) //Low bounds &mdash; check each prime independently↵
↵
http://www.spoj.com/problems/MAIN12B/ (3) //NICE [Factorization][Sort][Unique]↵
↵
http://www.spoj.com/problems/AMR11E/ (2) //2664 is the biggest↵
↵
http://www.spoj.com/problems/GCPC11A/ (4) //Very nice &mdash; factorize + divide N by powers↵
↵
http://www.spoj.com/problems/AMR10C/ (3) //Maximum of factor-powers↵
↵
</spoiler>↵
↵
<spoiler summary="fenwick">↵
↵
http://www.spoj.com/problems/ADABEHIVE/ [2D]↵
↵
http://www.spoj.com/problems/ADACABAA/ [2D][Sparse]↵
↵
7591 &mdash; Distribution Center (4) //[NICE][SORTING]↵
↵
http://mirror.codeforces.com/contest/903/problem/D (5) //[NICE][BIG]↵
↵
http://mirror.codeforces.com/contest/102/problem/D (4) //[NICE][+DP][NORMALIZE]↵
↵
http://mirror.codeforces.com/gym/101047/problem/J [2D]↵
↵
http://www.spoj.com/problems/MATSUM/ [2D]↵
↵
https://www.hackerearth.com/practice/data-structures/advanced-data-structures/fenwick-binary-indexed-trees/practice-problems/algorithm/counting-in-byteland/ [3D]↵
↵
https://devskill.com/CodingProblems/ViewProblem/300↵
↵
http://mirror.codeforces.com/contest/707/problem/E 7 [2D]↵
↵
http://mirror.codeforces.com/contest/749/problem/E 8↵
↵
http://mirror.codeforces.com/problemset/gymProblem/101055/D 5 [2D]↵
↵
11240 UVA (4)↵
↵
http://mirror.codeforces.com/contest/459/problem/D (4) //[NICE][SWEEPING]↵
↵
http://mirror.codeforces.com/contest/61/problem/E (4) //[NICE][CLASSICAL][2*FW][NORMALIZE]↵
↵
http://mirror.codeforces.com/contest/669/problem/E 5 //fenwicks &mdash; sparse↵
↵
http://mirror.codeforces.com/contest/777/problem/E 4 //MAXIMUM↵
↵
http://www.spoj.com/problems/TULIPNUM/ 4 //inc &mdash; 1 nor+num|sum(A[B],A[E])↵
↵
http://mirror.codeforces.com/contest/799/problem/C 3 //MAX FW (but possibly easier?)↵
↵
http://mirror.codeforces.com/contest/831/problem/E 4 //MAP to get ORDER &mdash; FW == LIST↵
↵
http://www.spoj.com/problems/SAS001/ (4) //Nice &mdash; number of inversions + 2P↵
↵
http://www.spoj.com/problems/TPGA/ (4) //NICE &mdash; Lesser*(N-i-1)!↵
↵
http://www.spoj.com/problems/SGIFT/ (4) //BS works too↵
↵
http://www.spoj.com/problems/SUMSUM/ (5) //Bit-by-Bit cnt 0/1↵
↵
http://www.spoj.com/problems/AKVQLD03/ (3) //Classical fenwick &mdash; easy↵
↵
http://www.spoj.com/problems/ZIGZAG2/ (6) //Very nice &mdash; FW + BS + DP↵
↵
http://mirror.codeforces.com/contest/849/problem/E (7) //2D Fenwick / ST+TP [NICE]↵
↵
http://www.spoj.com/problems/CRAYON/ (5) //VERY NICE [2*FW &mdash; begin + end]↵
↵
http://www.spoj.com/problems/NITT8/ (4) //Norm. + Store indices in MAX-Fenwick [REVERSE] [VERY NICE]↵
↵
http://www.spoj.com/problems/DCEPC705/ (4) //NICE! Sort + Fenwick↵
↵
http://www.spoj.com/problems/DCEPC206/ (3) //NICE & EASY <or many other approaches>↵
↵
http://www.spoj.com/problems/KOPC12G/ (4) //N Fenwick trees↵
↵
http://www.spoj.com/problems/TRIPINV/ (4) //2xFenwick (triples counting)↵
↵
http://mirror.codeforces.com/contest/597/problem/C (4) //[VERY NICE] 11*Fenwick↵
↵
http://mirror.codeforces.com/contest/12/problem/D (4) //NICE [triplet-comparing][sort]↵
↵
</spoiler>↵
↵
<spoiler summary="fft">↵
↵
http://www.spoj.com/problems/ADAMATCH/↵
↵
UVA 12633↵
↵
6886 &mdash; Golf Bot [LA]↵
↵
http://www.spoj.com/problems/POLYMUL/en/↵
↵
Gym 100960C [2015-2016 Petrozavodsk Winter Training Camp, Nizhny Novgorod SU Contest]↵
↵
https://www.codechef.com/problems/APRPS↵
↵
https://www.codechef.com/problems/POLYEVAL↵
↵
http://www.spoj.com/problems/TSUM/ 5↵
↵
13182 UVA 5 //ACTG hamming↵
↵
http://mirror.codeforces.com/contest/827/problem/E (8) //MAGIC↵
↵
http://www.spoj.com/problems/MAXMATCH/ 5 //abc hamming↵
↵
</spoiler>↵
↵
<spoiler summary="flow">↵
↵
http://www.spoj.com/problems/FASTFLOW/en/ //Raw (no sauce)↵
↵
http://mirror.codeforces.com/contest/78/problem/E (5) //NICE [Matching-like][+BFS]↵
↵
4322 — Destroying the bus stations (Live Archive)↵
↵
11380 — Down Went The Titanic (UVA) //Interesting grid problem↵
↵
6395 — Surely You Congest (LA) //VERY NICE [slightly advanced]↵
↵
7204 — Blood groups (LA)↵
↵
http://mirror.codeforces.com/gym/100963 (Flame of Nucleus — F)↵
↵
11167 — Monkeys in the Emei Mountain //Also harder (imho)↵
↵
http://mirror.codeforces.com/problemset/problem/653/D (+BS)↵
↵
13000 — VIP Treatment (+BS)↵
↵
1242 — Necklace↵
↵
https://www.deadline24.pl/assets/problemsets/dl24.elim.2017.B.en.pdf (DEADLINE 24 problem — not sure if it can be submited :O)↵
↵
3487 — Duopoly (Near matching)↵
↵
http://mirror.codeforces.com/problemset/problem/727/D↵
↵
http://mirror.codeforces.com/problemset/problem/704/D [Also advanced]↵
↵
5418 — A Plug for UNIX (LA)↵
↵
4957 — Fake scoreboard (LA) //If I remember well, other solutions was also possible↵
↵
1155 — Power Transmission (LOJ) //(classical)↵
↵
https://www.codechef.com/problems/ROBOTDAG //Ford-Fukherson↵
↵
10804 — Gopher Strategy (UVA)↵
↵
11506 — Angry Programmer (UVA) //Nodes division↵
↵
10511 — Councilling (UVA)↵
↵
563 — Crimewave↵
↵
1306 — The K-League (UVA)↵
↵
1345 — Jamie's Contact Groups↵
↵
10092 — The Problem with the Problem Setter↵
↵
Problem B. Roller Coaster Scheduling (GCJ — 2017)↵
↵
259 — Software Allocation (UVA)↵
↵
5905 — Pool construction (LA) //Imho harder↵
↵
10480 — Sabotage↵
↵
http://mirror.codeforces.com/contest/808/problem/F 6 //NICE &mdash; nontrivial (max matching with bigger flows)↵
↵
http://mirror.codeforces.com/contest/847/problem/J 6 //Probably not flows &mdash; matching-like↵
↵
</spoiler>↵
↵
<spoiler summary="flow-matching-like">↵
↵
http://www.spoj.com/problems/ADAHOSE/ [DUAL-GRAPH]↵
↵
http://mirror.codeforces.com/contest/903/problem/G (6) //[VERY NICE][SEG-TREE][CUT]↵
↵
3837 [LA] //Stable Marriage↵
↵
UVA 1175 //Stable Marriage↵
↵
11594 — All Pairs Maximum Flow (UVA)↵
↵
http://www.spoj.com/problems/ADABLOOM/ //Maximum matching in general graph↵
↵
11439 — Maximizing the ICPC //Maximum matching in general graph↵
↵
1376 — Animal Run //Max flow on planar graph (Dual == shortest path over edges)↵
↵
10989 — Bomb, Divide and Conquer //Stoer-Wagner — global cut↵
↵
</spoiler>↵
↵
<spoiler summary="floyd-warshall">↵
↵
10724 UVA↵
↵
UVA 117↵
↵
http://mirror.codeforces.com/problemset/problem/21/D↵
↵
UVA 1198↵
↵
LightOJ 1086 //+DP↵
↵
http://www.spoj.com/problems/INGRED/ //+DP↵
↵
UVA 10048↵
↵
UVA 125↵
↵
Gym 101223C [2017 Facebook Hacker Cup, Round 1] //+DP↵
↵
LightOJ 1221↵
↵
UVA 423↵
↵
UVA 12179 //+DP↵
↵
UVA 1416↵
↵
UVA 1233 ↵
↵
UVA 10793↵
↵
10099 UVA↵
↵
UVA 869↵
↵
LightOJ 1174↵
↵
http://www.spoj.com/problems/ARBITRAG/ //Other algos shall work too ↵
↵
13211 UVA (5) //NICE &mdash; FW adding states↵
↵
http://www.spoj.com/problems/ROHAAN/ (3) //Classical↵
↵
http://mirror.codeforces.com/contest/25/problem/C (4) //Adding new edges .. need FW principal↵
↵
http://mirror.codeforces.com/contest/33/problem/B (3) //NICE [dijkstra could work too]↵
↵
</spoiler>↵
↵
<spoiler summary="friedvaldAlgorithm">↵
↵
http://www.spoj.com/problems/ADAPOWER/↵
↵
4956 [LA]↵
↵
</spoiler>↵
↵
<spoiler summary="game_theory">↵
↵
http://www.spoj.com/problems/ADAGAME/ [DP]↵
↵
http://www.spoj.com/problems/ADAGAME2/↵
↵
http://www.spoj.com/problems/ADAGAME4/ ↵
↵
http://www.spoj.com/problems/ADAQUBIC/↵
↵
http://www.spoj.com/problems/ADAFIMBR/↵
↵
http://www.spoj.com/problems/ADAGAME5/↵
↵
http://www.spoj.com/problems/ADAXMAS/↵
↵
http://mirror.codeforces.com/contest/138/problem/D (7) //[VERY NICE][DP][OBSERVATION]↵
↵
https://arc087.contest.atcoder.jp/tasks/arc087_c (5) //[VERY NICE][TRIE][SEQUENCE]↵
↵
http://mirror.codeforces.com/contest/120/problem/E (3) //[NICE][SYMETRY][PARITY]↵
↵
http://mirror.codeforces.com/contest/88/problem/E (5) //[VERY NICE][PREFIX-XOR][NIMBERS][SQRT][MATH]↵
↵
http://mirror.codeforces.com/contest/69/problem/D (4) //[NICE][DP] Reflection can be ignored↵
↵
http://mirror.codeforces.com/contest/55/problem/C (4) //[NICE] Size of piece from border↵
↵
http://mirror.codeforces.com/problemset/problem/255/E --MEX↵
↵
https://devskill.com/CodingProblems/ViewProblem/91↵
↵
https://devskill.com/CodingProblems/ViewProblem/364↵
↵
Project Euler #96: Su Doku //Sudoku↵
↵
11859 UVA 4↵
↵
11863 UVA 4↵
↵
11892 UVA 3 //Probably solved by many↵
↵
11534 UVA 5↵
↵
http://www.spoj.com/problems/VECTAR11/ 4 //Nsqrt(N) passes [with break]↵
↵
http://mirror.codeforces.com/contest/768/problem/E (4) //NICE &mdash; Grundy↵
↵
http://www.spoj.com/problems/SYNC13C/ (4) //2*DP {maybe not seeing sth}↵
↵
http://mirror.codeforces.com/contest/787/problem/C (4)↵
↵
http://mirror.codeforces.com/contest/794/problem/C (3) //Find optimal strategy: choose back/front↵
↵
http://mirror.codeforces.com/contest/794/problem/E (5) //NICE Find stategy: Even/Odd↵
↵
http://mirror.codeforces.com/contest/812/problem/E (7) //Advanced NIM strategy↵
↵
http://www.spoj.com/problems/GAMEMVS/ (4) //Nimbers (Ai^X)<=Ai↵
↵
http://www.spoj.com/problems/PLAYGAME/ (3) //Check pattern↵
↵
http://www.spoj.com/problems/CHAOS_CC/ (4) //VERY NICE [nimbers]↵
↵
http://mirror.codeforces.com/contest/851/problem/E (5) //Very nice [nimbers] [bitset]↵
↵
http://www.spoj.com/problems/CHGROOM/ (4) //+Factorisation [NICE & Easy]: Win unless 2 prime factors↵
↵
http://www.spoj.com/problems/EALP1/ (4) //NICE ~ Possible Moves of NIM↵
↵
http://www.spoj.com/problems/GAME3/ (4) //VERY NICE &mdash; pattern watching [A145812]↵
↵
http://www.spoj.com/problems/GAME2/ (5) //VERY NICE &mdash; https://community.topcoder.com/tc?module=Static&d1=match_editorials&d2=srm338 (CAKE)↵
↵
http://www.spoj.com/problems/CF36D/ (5) //Pattern watching (care for 1)↵
↵
http://mirror.codeforces.com/contest/15/problem/C (4) //VERY NICE [XOR: A,1,A+1,0..repeat]↵
↵
http://mirror.codeforces.com/contest/39/problem/E (4) //Slightly [DP][MATH][ROUNDING]↵
↵
http://mirror.codeforces.com/contest/63/problem/E (5) //[NICE][BITMASK-DP]↵
↵
</spoiler>↵
↵
<spoiler summary="gauss">↵
↵
12910 &mdash; Snakes and Ladders [UVA]↵
↵
UVA 10828↵
↵
http://mirror.codeforces.com/gym/100923/problem/C↵
↵
4963 [LA]↵
↵
UVA 12849↵
↵
Gym 100962A [2015-2016 Petrozavodsk Winter Training Camp, Moscow SU Trinity Contest][NICE]↵
↵
UVA 10109 [NICE][HARD-WORK]↵
↵
</spoiler>↵
↵
<spoiler summary="geometry">↵
↵
http://www.spoj.com/problems/ADAPICK/↵
↵
http://www.spoj.com/problems/ADAKOHL/↵
↵
http://mirror.codeforces.com/contest/908/problem/C (3)↵
↵
http://mirror.codeforces.com/contest/140/problem/A (3) //Circles around bigger circle↵
↵
http://mirror.codeforces.com/contest/136/problem/D (4) //+Brute-Force↵
↵
http://mirror.codeforces.com/contest/127/problem/A (1) //Points distance↵
↵
http://mirror.codeforces.com/gym/101597/problem/B (3) //Simply  brute-force just the closest to points↵
↵
http://mirror.codeforces.com/contest/70/problem/D (5) //Dynamic Convex Hull↵
↵
https://icpc.kattis.com/problems/airport //Proposed by [user:tautsjasiunsas,2017-128-01-01]↵
↵
https://www.hackerrank.com/contests/world-codesprint-7/challenges/elastic-rope/problem↵
↵
https://devskill.com/CodingProblems/ViewProblem/20 [EASY]↵
↵
UVA 10321 //Polygon intersection↵
↵
UVA 11265 //Polygon point +/-↵
↵
UVA 13112 //Polygon↵
↵
10907 UVA [Area of polygon from a point]↵
↵
3378 &mdash; Swamp Things [LA] &mdash; Maximum points on line↵
↵
UVA 11768 //Discrete points↵
↵
2542 [LA] //Arc size [formula]↵
↵
UVA 1571 //As below [easier]↵
↵
https://www.codechef.com/problems/ALLPOLY //[NICE] Point seeing polygon↵
↵
http://www.spoj.com/problems/IITKWPCL/ //Point distance↵
↵
UVA 11281 //circle~triangle↵
↵
UVA 12921 //circle reconstruction↵
↵
UVA 190 //circle from 3 points↵
↵
UVA 12240 //pts>circle↵
↵
UVA 438 //circle pt↵
↵
LightOJ 1018 //Minimum # of lines through all pts [VERY NICE]↵
↵
UVA 11008 //Similar as above↵
↵
UVA 12830 //Biggest rectangle without points inside↵
↵
UVA 11012 //Most distant points↵
↵
UVA 1683 //Closest points↵
↵
UVA 12389 //3D MH Closest Points↵
↵
http://www.spoj.com/problems/AMR12C/ //Pt closest to all other points↵
↵
http://www.spoj.com/problems/CLOPPAIR/ //Closest pair of points↵
↵
UVA 10678 //Circles intersection↵
↵
http://mirror.codeforces.com/problemset/problem/600/D //Circles intersection↵
↵
LightOJ 1118 //Circles intersection↵
↵
http://www.spoj.com/problems/CERC07C/en/ //Bounding circle↵
↵
UVA-10005 //Bounding circle↵
↵
2407 [LA] //Bounding Sphere↵
↵
LightOJ 1120 //Rectangle's Union↵
↵
LightOJ 1130 //Circle x Rectangle intersection↵
↵
UVA 11177 //Circle x Convex Polygon↵
↵
http://mirror.codeforces.com/problemset/problem/610/D //Lines intersections (axes parallel)↵
↵
6263 [LA] //Pt in areas↵
↵
LightOJ 1058 //# parallelograma↵
↵
UVA 12931 //Common area of polygons↵
↵
UVA 10301 //Intersecting circles↵
↵
UVA 453 //Circles intersection↵
↵
http://mirror.codeforces.com/problemset/problem/681/E //Circles intersection↵
↵
UVA 920 //Lines intersecion (etc..)↵
↵
UVA 12556↵
↵
http://mirror.codeforces.com/problemset/problem/793/C //Intersection ans similar↵
↵
UVA 11343 //Intersection of segments↵
↵
UVA 866 //Intersection of segments↵
↵
Gym 100190I [2011 ACM-ICPC East Central North America (ECNA 2011)] //Segment intersection↵
↵
http://mirror.codeforces.com/gym/100917/problem/K↵
↵
UVA 11686 //Segment intersection↵
↵
LightOJ 1388↵
↵
UVA 833 //Segment intersection↵
↵
LightOJ 1196 //Points sides↵
↵
UVA 10167 //Points sides↵
↵
UVA 12818 //Arc & Point distance↵
↵
http://www.spoj.com/problems/SICRANO/ //Point-line distance↵
↵
http://mirror.codeforces.com/problemset/problem/614/C //Point-line distance↵
↵
UVA 13117 //Point-line distance↵
↵
UVA 12483 //Point-line distance↵
↵
UVA 12173  //Point-line distance↵
↵
UVA 10075 //Point distance on sphere↵
↵
https://www.hackerrank.com/contests/booking-hackathon/challenges/nearby-attractions/problem //Pt sphr↵
↵
UVA 535 //Point distance on sphere↵
↵
UVA 10897 //Sphere tavelling↵
↵
UVA 11817 //Sphere travelling↵
↵
UVA 10316 //Sphere travelling↵
↵
UVA 1469 //Fractions distance 3D↵
↵
11930 ↵
↵
12173 UVA 3↵
↵
12194 UVA 4↵
↵
11894 UVA 3↵
↵
11769 UVA 7↵
↵
11665 UVA 5↵
↵
11509 UVA 4↵
↵
11355 UVA 5↵
↵
11265 UVA 6 //Nice one | polygon &mdash; cut/pt-check/area↵
↵
11123 UVA 4 //Counting trapezoids↵
↵
11177 UVA 6 //BS+Polygon/Circle intersection↵
↵
11186 UVA 3 ↵
↵
11008 UVA 5 //with DP → #intersected triangles↵
↵
11012 UVA 5 //Nejvzdálenější body (Manhatton 3D)↵
↵
11072 UVA 4 //Points v poly gonu↵
↵
http://mirror.codeforces.com/problemset/problem/682/E 6 (biggest triangle)↵
↵
http://mirror.codeforces.com/contest/672/problem/C 4 //easy &mdash; just think it up↵
↵
http://mirror.codeforces.com/contest/667/problem/A 2 //vzorecky↵
↵
http://mirror.codeforces.com/contest/793/problem/C 5 //EASY but beware of epsilons (NICE)↵
↵
http://mirror.codeforces.com/contest/794/problem/B 2 //Can be done with BS↵
↵
http://mirror.codeforces.com/contest/814/problem/D 5 //+DP on trees (NICE &mdash; but low geom.)↵
↵
10750 UVA 3 //Closest points &mdash; try all pairs↵
↵
http://mirror.codeforces.com/contest/820/problem/B 3 //Polygon angle find!↵
↵
13213 UVA 5 //VERY NICE &mdash; Voronoi diagram (low constraints so not actually needed)↵
↵
13215 UVA 3 //EASY &mdash; Sum areas and find side lengths↵
↵
http://www.spoj.com/problems/IITKWPCC/ (5) //VERY VERY NICE &mdash; Nqrt(N)log(N)↵
↵
http://www.spoj.com/problems/NNS/ (5) Closest points query [fake geometry] {__128}[NICE]↵
↵
http://mirror.codeforces.com/contest/849/problem/B (3) //X-Product &mdash; side↵
↵
http://www.spoj.com/problems/AMR12C/ (5) //Point closest to all other points (with speed)↵
↵
http://www.spoj.com/problems/SICRANO/ (3) //Line-Point distance↵
↵
http://www.spoj.com/problems/VCIRCLES/ (5) //Heavy geometrical ****↵
↵
http://www.spoj.com/problems/CIRU/ (5) //Same as above [yet bigger constraints]↵
↵
http://www.spoj.com/problems/THREETW1/ (4) //Fermat point search↵
↵
http://www.spoj.com/problems/CLOPPAIR/ (4) //Closest pair of points↵
↵
http://www.spoj.com/problems/MAXLN/ (2) //Some basic (4*r^2+.25)↵
↵
http://www.spoj.com/problems/KOLICA/ (4) //VERY NICE [nasty iff party]↵
↵
http://mirror.codeforces.com/contest/598/problem/C (4) //NICE ~ Precision! [ld]↵
↵
http://mirror.codeforces.com/contest/18/problem/A (2) //EASY&FINE: Pythagoreas↵
↵
http://mirror.codeforces.com/contest/40/problem/A (2) //[EASY][DISTANCE]↵
↵
</spoiler>↵
↵
<spoiler summary="graph">↵
↵
2827 [LA] //3Coloring↵
↵
2243 [LA] //3Coloring↵
↵
5603 [LA] //Coloring↵
↵
UVA 1658 //Shortest paths↵
↵
UVA 12821 //Shortest paths↵
↵
http://mirror.codeforces.com/contest/27/problem/D (5)↵
↵
11387 (UVA) 4↵
↵
http://www.spoj.com/problems/VFRIEND2/ (5) //Graph possible check↵
↵
http://mirror.codeforces.com/contest/859/problem/E (4) //VERY NICE (2 cases: CYCLE [x2] / TREE [x(Size+1)]↵
↵
http://mirror.codeforces.com/contest/847/problem/C (2) //Forest making Easy&Nice↵
↵
http://mirror.codeforces.com/contest/863/problem/C (3) //Cycle in states↵
↵
</spoiler>↵
↵
<spoiler summary="greedy">↵
↵
http://mirror.codeforces.com/contest/146/problem/D (4) //[NICE][CONSTRUCTION]↵
↵
http://mirror.codeforces.com/contest/146/problem/C (3) //[EASY][NICE][TWO-CASES]↵
↵
http://mirror.codeforces.com/contest/139/problem/D (4) //Muchas cases↵
↵
7887 &mdash; Back to the Future (4) //[NICE][2*HEAP]↵
↵
http://mirror.codeforces.com/contest/910/problem/A (2) //DP works too↵
↵
http://mirror.codeforces.com/contest/125/problem/D (4) //Limited possibilities↵
↵
http://mirror.codeforces.com/contest/902/problem/A (2) //Just keep last↵
↵
http://mirror.codeforces.com/contest/898/problem/D (4) //[NICE][FENWICK/OR/PREFIX]↵
↵
http://mirror.codeforces.com/contest/118/problem/C (4) //[NICE] &mdash; Try each digit (iterate in waves)↵
↵
7706 &mdash; Pokemons (2) //Sweep and keep maximum↵
↵
http://mirror.codeforces.com/contest/893/problem/D (4) //[NICE][SWEEP][MAXIMUM] &mdash; pay max when have to↵
↵
http://mirror.codeforces.com/contest/892/problem/B (2) //Sweep from back↵
↵
http://mirror.codeforces.com/contest/102/problem/C (3) //sort by frequency↵
↵
https://devskill.com/CodingProblems/ViewProblem/419 (2) //Sweep from back↵
↵
http://mirror.codeforces.com/contest/890/problem/C (3) //frequence↵
↵
http://mirror.codeforces.com/contest/890/problem/B (2) //[EASY][REVERSE]↵
↵
http://mirror.codeforces.com/contest/888/problem/B (2) //Equalize U/D and L/R↵
↵
http://mirror.codeforces.com/gym/101597/problem/J (4) //[NICE][SWEEP]↵
↵
http://mirror.codeforces.com/contest/76/problem/B (4) //[NICE][MATCHING-LIKE][2PTRS]↵
↵
http://mirror.codeforces.com/contest/73/problem/B (4) //[IMPLEMENTATION][SORTING]↵
↵
http://mirror.codeforces.com/contest/883/problem/K (4) //Nice &mdash; Two sweeps↵
↵
http://mirror.codeforces.com/contest/49/problem/D (3) //NICE &mdash; 1010101 OR 0101010 [haming]↵
↵
http://mirror.codeforces.com/contest/58/problem/C (4) //NICE &mdash; group trees by slopes↵
↵
http://mirror.codeforces.com/contest/729/problem/D 3↵
↵
http://mirror.codeforces.com/contest/729/problem/E 4↵
↵
http://mirror.codeforces.com/contest/725/problem/D 4↵
↵
http://mirror.codeforces.com/contest/725/problem/F 9↵
↵
http://mirror.codeforces.com/contest/732/problem/E 5↵
↵
http://mirror.codeforces.com/contest/727/problem/F 6↵
↵
http://mirror.codeforces.com/contest/724/problem/D 5↵
↵
http://mirror.codeforces.com/contest/723/problem/C 4↵
↵
http://mirror.codeforces.com/contest/719/problem/B 2↵
↵
http://mirror.codeforces.com/contest/712/problem/C 3↵
↵
13152 UVA (4)↵
↵
http://mirror.codeforces.com/contest/746/problem/E 5↵
↵
http://mirror.codeforces.com/contest/746/problem/D 3↵
↵
http://mirror.codeforces.com/contest/749/problem/C 3↵
↵
11737 UVA (3)↵
↵
11786 UVA (4)↵
↵
11630 UVA (5)↵
↵
11563 UVA (4)↵
↵
11491 UVA (4)↵
↵
11330 UVA (3)↵
↵
11089 UVA (2)↵
↵
http://mirror.codeforces.com/contest/884/problem/D (4) //PQ or Sort↵
↵
http://www.spoj.com/problems/SQRMINSUM/ 3 //solve-able in O(N+M)-arrayqueue↵
↵
http://www.spoj.com/problems/MSCHED/ 3 //sweep from back↵
↵
http://www.spoj.com/status/ns=18780683 4 //all perm + A<B<C works↵
↵
http://www.spoj.com/problems/NINJA7/ (3) //sort by diff↵
↵
http://www.spoj.com/problems/NINJA2/ (4) //try all possib. (26)↵
↵
http://mirror.codeforces.com/contest/767/problem/E (6)↵
↵
http://mirror.codeforces.com/contest/637/problem/B (3) //NICE pro prvaky↵
↵
http://mirror.codeforces.com/contest/777/problem/B (3) // -||-↵
↵
http://mirror.codeforces.com/contest/777/problem/D (3) //just go from end↵
↵
http://mirror.codeforces.com/contest/779/problem/C (3) //NICE pro prváky↵
↵
http://www.spoj.com/problems/SPCU/ (2) //Easy &mdash; zamysleni (max int = index)↵
↵
http://www.spoj.com/problems/LOPOV/ (4) //sort + queue (or just queue) NICE↵
↵
http://mirror.codeforces.com/contest/792/problem/E (5) //T%S<=T/S + check proper↵
↵
http://mirror.codeforces.com/contest/807/problem/E (5) //NICE &mdash; put asice P2 / rest &mdash; greedy from small↵
↵
http://mirror.codeforces.com/contest/799/problem/E (5) //Many queues &mdash; but NICE↵
↵
http://mirror.codeforces.com/contest/808/problem/C (3) //EASY↵
↵
http://mirror.codeforces.com/contest/802/problem/B (4) //Priority by "next"↵
↵
10850 UVA (4) //Queue a brute-force↵
↵
http://mirror.codeforces.com/contest/813/problem/A (1) //Zahrivacka pro prvaky↵
↵
10716 UVA (4) //NICE &mdash; always find closest pair↵
↵
http://mirror.codeforces.com/contest/816/problem/C (3) //NICE &mdash; greater<lesser side↵
↵
http://mirror.codeforces.com/contest/820/problem/D (5) //VERY NICE &mdash; O(N) -~- 5 events per number↵
↵
http://mirror.codeforces.com/contest/818/problem/B (2) //Zahrivacka pro prvaky↵
↵
http://mirror.codeforces.com/contest/822/problem/C (4) //Almost classical Sort+Queue↵
↵
http://mirror.codeforces.com/contest/825/problem/C (2) //Nice & Easy↵
↵
http://mirror.codeforces.com/contest/825/problem/D (3) //Update by modulo↵
↵
http://mirror.codeforces.com/contest/835/problem/B (2) // Zahhrivacka pro prvaky↵
↵
http://mirror.codeforces.com/contest/839/problem/B (3) //Nasty iffs &mdash; yet nice excersize↵
↵
http://www.spoj.com/problems/PCPC12I/ (4) //Swipe MINIMUM from left/right [10^6-A[i] trick]↵
↵
http://www.spoj.com/problems/AMR12I/ (3) //NICE a) MAX_SEG>=K b) (SEG_SIZE-1)/K+1↵
↵
http://www.spoj.com/problems/BUSYMAN/ (2) //NICE&EASY &mdash; Sort + keep minimum↵
↵
http://mirror.codeforces.com/contest/861/problem/C (3) //2+ but not same↵
↵
http://www.spoj.com/problems/WORKB/ (3) //Simple "min" formula for each neighbor↵
↵
http://mirror.codeforces.com/contest/864/problem/D (4) //VERY NICE &mdash; Frequency + unused↵
↵
http://www.spoj.com/problems/ROADTRIP/ (4) //VERY NICE &mdash; Keeping last lesser↵
↵
http://mirror.codeforces.com/contest/597/problem/B (3) //NICE [Classical]↵
↵
http://www.spoj.com/problems/SHLIGHTS/ (4)↵
↵
http://www.spoj.com/problems/MLK/ (3) //VERY NICE &mdash; Sum all prefix sums↵
↵
http://mirror.codeforces.com/contest/867/problem/C (4) //NICE [IMPLE][2POINTERS][MID+EPS]↵
↵
http://mirror.codeforces.com/contest/867/problem/E (5) //NICE [EASY-IMPLE][HARD-CONS]↵
↵
http://mirror.codeforces.com/contest/18/problem/D (4) //+Big Integer↵
↵
http://mirror.codeforces.com/contest/276/problem/D (4) //NICE &mdash; Find first mismatch bit (then 111...111)↵
↵
http://mirror.codeforces.com/contest/3/problem/B (4) //Divide 1/2 [sort][2pointers]↵
↵
http://mirror.codeforces.com/contest/3/problem/D (4) //?==) ..if open < 0: set max A-B to (↵
↵
http://mirror.codeforces.com/contest/26/problem/B (4) // +1 ( | -1 ): -1, erase .. erase sum in the end↵
↵
http://mirror.codeforces.com/contest/33/problem/A (2) //EASY [long-statement]↵
↵
http://mirror.codeforces.com/contest/44/problem/E (2) //Try mins then try maxs↵
↵
http://mirror.codeforces.com/contest/45/problem/D (3) //Priority-queue+'sort'↵
↵
</spoiler>↵
↵
<spoiler summary="hash">↵
↵
http://www.spoj.com/problems/ADACLEAN/↵
↵
7979 &mdash; Red Rover (3) //[NICE] //Many other ways to solve↵
↵
http://mirror.codeforces.com/contest/898/problem/F (5) //[VERY NICE]//Hash by 10↵
↵
http://mirror.codeforces.com/contest/114/problem/D (4) //[NICE] //N^2Log(N) might/might-not be OK↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/1503 (7) //[NICE][BS][OPTI]↵
↵
Gym 101466E [2017 ACM-ICPC, Universidad Nacional de Colombia Programming Contest][NICE]↵
↵
12012 UVA 4↵
↵
http://mirror.codeforces.com/contest/727/problem/E 7↵
↵
http://mirror.codeforces.com/contest/718/problem/D 8↵
↵
11855 UVA 4↵
↵
http://mirror.codeforces.com/contest/752/problem/D 5↵
↵
http://mirror.codeforces.com/contest/825/problem/F 5 //String + Periods↵
↵
http://mirror.codeforces.com/contest/835/problem/D 4 //Palindromes↵
↵
http://www.spoj.com/problems/CF25E/ (5) //VERY NICE [IMPLE>CONCEPT]↵
↵
http://mirror.codeforces.com/contest/7/problem/D (4) //Palindromes ↵
↵
http://mirror.codeforces.com/contest/19/problem/C (4) //[NICE]: Not a string↵
↵
</spoiler>↵
↵
<spoiler summary="hull">↵
↵
http://www.spoj.com/problems/GARDENHU/en/↵
↵
2453 &mdash; Wall [LA]↵
↵
UVA 13213↵
↵
UVA 11096↵
↵
Gym 100792G [2015-2016 ACM-ICPC, NEERC, Moscow Subregional Contest]↵
↵
https://www.codechef.com/problems/KTHCON↵
↵
http://mirror.codeforces.com/problemset/problem/605/C↵
↵
UVA 218↵
↵
UVA 11072↵
↵
11168 UVA↵
↵
UVA 12307↵
↵
Gym 100963I [2007-2008 Summer Petrozavodsk Camp, Japanese Contest, 2007-08-29]↵
↵
UVA 11243↵
↵
UVA 10256↵
↵
109 SCUD Busters↵
↵
UVA 13024 [NICE]↵
↵
UVA 10002↵
↵
Gym 100886H [2015-2016 Petrozavodsk Winter Training Camp, Saratov SU Contest]↵
↵
UVA 1139↵
↵
UVA 681↵
↵
UVA 811↵
↵
https://www.codechef.com/problems/MGCHGEOM↵
↵
UVA 11769 //3D↵
↵
</spoiler>↵
↵
<spoiler summary="chess">↵
↵
http://www.spoj.com/problems/ADACHESS/↵
↵
http://www.spoj.com/problems/ADACHES2/↵
↵
http://www.spoj.com/problems/ADAGAME5/↵
↵
http://www.spoj.com/problems/ADAXMAS/↵
↵
http://mirror.codeforces.com/contest/131/problem/E (4) //[NICE][STL][SORTING][QUEEN]↵
↵
http://mirror.codeforces.com/contest/42/problem/B (4) //NICE &mdash; Checkmate check↵
↵
UVA 10748 //bfs↵
↵
LightOJ 1143↵
↵
https://www.hackerearth.com/practice/algorithms/greedy/basics-of-greedy-algorithms/practice-problems/algorithm/harry-and-ron-play-a-game-of-chess/↵
↵
UVA 10196↵
↵
http://www.spoj.com/problems/KNMOVE/↵
↵
UVA 11352↵
↵
http://www.spoj.com/problems/NAKANJ/ //BFS↵
↵
LightOJ 1010↵
↵
LightOJ 1171 //MM↵
↵
2883 LA↵
↵
UVA 439 ↵
↵
http://www.spoj.com/problems/TRKNIGHT/ //??↵
↵
2308 LA↵
↵
http://www.spoj.com/problems/CCHESS/ //Dijkstra↵
↵
http://mirror.codeforces.com/problemset/problem/630/H //[ROOKS][BIG][COMBINATORICS]↵
↵
LightOJ 1005 //As above (but with real rooks)↵
↵
LightOJ 1061 //Placing queens↵
↵
UVA 11085↵
↵
UVA 10094 //Queen placing [NICE][PATTERN]↵
↵
https://devskill.com/CodingProblems/ViewProblem/383↵
↵
11852  UVA (6)↵
↵
http://www.spoj.com/problems/KLUG1/ (2) //Jumps of horse↵
↵
http://www.spoj.com/problems/CODESPTD/ (5) //VERY NICE &mdash; DP [Queens]↵
↵
http://mirror.codeforces.com/contest/3/problem/A (2) //Imple &mdash; Shortest path for king↵
↵
http://mirror.codeforces.com/contest/38/problem/B (2) //NICE &mdash; Simple possition checking↵
↵
</spoiler>↵
↵
<spoiler summary="implementation">↵
↵
http://mirror.codeforces.com/contest/146/problem/A (1)↵
↵
http://www.spoj.com/problems/ESYR/ (1) //Bad one :/↵
↵
http://mirror.codeforces.com/contest/908/problem/A (1)↵
↵
http://mirror.codeforces.com/contest/147/problem/A (2) //Parsing↵
↵
http://mirror.codeforces.com/contest/139/problem/A (1)↵
↵
http://mirror.codeforces.com/contest/137/problem/A (1)↵
↵
7886 &mdash; Assigning Teams  (2) //[EASY][SORTING]↵
↵
http://mirror.codeforces.com/contest/133/problem/A (1)↵
↵
http://mirror.codeforces.com/contest/134/problem/A (1)↵
↵
http://mirror.codeforces.com/contest/131/problem/A (1) ↵
↵
http://mirror.codeforces.com/contest/127/problem/B (1) [EASY]↵
↵
http://mirror.codeforces.com/contest/899/problem/B (2) //Dates↵
↵
http://mirror.codeforces.com/contest/898/problem/C (3) //No thinking &mdash; just implementation↵
↵
6157 How do spiders walk on water? (4)  //boring problem↵
↵
http://mirror.codeforces.com/contest/900/problem/A (1)↵
↵
7613 Relative atomic mass (1)↵
↵
http://mirror.codeforces.com/contest/122/problem/A (1) //Find all lucky↵
↵
http://mirror.codeforces.com/contest/120/problem/B (1) //Iteration↵
↵
http://mirror.codeforces.com/contest/120/problem/A (1) //Iff/Logic↵
↵
http://mirror.codeforces.com/contest/118/problem/B (2) //[PRINTING]↵
↵
http://mirror.codeforces.com/contest/108/problem/A (1) //[EASY][PRINT][TIME]↵
↵
http://mirror.codeforces.com/contest/106/problem/A (1) //Iff-party↵
↵
http://mirror.codeforces.com/contest/890/problem/A (1) //if or perm↵
↵
http://mirror.codeforces.com/contest/90/problem/B (2) //No idea &mdash; just cycles↵
↵
http://mirror.codeforces.com/contest/75/problem/A (1) //conversion↵
↵
http://mirror.codeforces.com/contest/884/problem/B (1) //Simple sum +N-1↵
↵
http://mirror.codeforces.com/contest/48/problem/A (1) //Very easy [fe. perm]↵
↵
http://mirror.codeforces.com/contest/51/my (2) //Lex-lowest-string (|s|=4)↵
↵
http://mirror.codeforces.com/contest/54/problem/A (2) //Single sweep↵
↵
http://mirror.codeforces.com/contest/719/problem/C 3↵
↵
http://mirror.codeforces.com/contest/747/problem/E 4↵
↵
http://mirror.codeforces.com/contest/754/problem/C 5↵
↵
11482 UVA (4)↵
↵
11291 UVA (3)↵
↵
11070 UVA (5)  //evaluation of expression↵
↵
11074 UVA (2)↵
↵
http://mirror.codeforces.com/contest/678/problem/B 2 //calendar days↵
↵
http://mirror.codeforces.com/contest/643/problem/A 3 //easy &mdash; just simulate↵
↵
http://mirror.codeforces.com/contest/770/problem/D 5 //easy &mdash; but pain &mdash; draw↵
↵
http://mirror.codeforces.com/contest/789/problem/B 3 //simulate (mby twice)↵
↵
13171 UVA (1)↵
↵
10800 UVA (3)↵
↵
http://mirror.codeforces.com/contest/828/problem/B 2 //EASY & NICE &mdash; just analysis↵
↵
http://mirror.codeforces.com/contest/825/problem/B 2 //EASY & NICE &mdash; Piskvorky &mdash; pro prvaky↵
↵
http://mirror.codeforces.com/contest/837/problem/B 2 //Just implementation↵
↵
http://mirror.codeforces.com/contest/837/problem/C 2 //Some nasty iffs↵
↵
http://mirror.codeforces.com/contest/845/problem/B 2 //Easy pro prvaky↵
↵
http://mirror.codeforces.com/contest/845/problem/D 3 //Iffs &mdash; folow the rules↵
↵
http://www.spoj.com/problems/UNIHW/ 4 //NICE (but many iffs)↵
↵
http://mirror.codeforces.com/contest/5/problem/A (2) //Parsing↵
↵
http://mirror.codeforces.com/contest/5/problem/B (3) //Output formating↵
↵
http://mirror.codeforces.com/contest/6/problem/B (2) //Simply check by adjancecy vector + set↵
↵
http://mirror.codeforces.com/contest/7/problem/A (1) //Oneinteresting if↵
↵
http://mirror.codeforces.com/contest/8/problem/B (2) //Sample vectors + set/or/array↵
↵
http://mirror.codeforces.com/contest/12/problem/A (1) //Find mirror by middle↵
↵
http://mirror.codeforces.com/contest/16/problem/A (1) //Easy check of chars↵
↵
http://mirror.codeforces.com/contest/21/problem/A (2) //Easy but nasty iff imple↵
↵
http://mirror.codeforces.com/contest/31/problem/B (2) //Boring imple↵
↵
http://mirror.codeforces.com/contest/34/problem/C (3) //Easy string parsing↵
↵
http://mirror.codeforces.com/contest/41/problem/C (2) //String parsing↵
↵
</spoiler>↵
↵
<spoiler summary="inclusion-exclusion">↵
↵
http://www.spoj.com/problems/KPRIMESB/ (4)↵
↵
http://www.spoj.com/problems/IITKWPCH/ (4) //NICE &mdash; on bits↵
↵
http://www.spoj.com/problems/SUBSET/ (5) //VERY NICE &mdash; 3^10 (^2 but not exactly) (+ sorting)↵
↵
</spoiler>↵
↵
<spoiler summary="interactive">https://www.hackerearth.com/practice/algorithms/dynamic-programming/bit-masking/practice-problems/algorithm/special-pairs-7/description/ (4) //NICE [Brute-force]↵
↵
</spoiler>↵
↵
<spoiler summary="interactive">↵
↵
http://mirror.codeforces.com/contest/897/problem/D (4) //NICE! Back/Front↵
↵
http://mirror.codeforces.com/contest/727/problem/C (2)↵
↵
http://mirror.codeforces.com/contest/810/problem/D (4) //BS * 3 (same)↵
↵
http://mirror.codeforces.com/contest/811/problem/D (4) //BFS &mdash; easy .. some ifs↵
↵
http://mirror.codeforces.com/contest/835/problem/E (4) //NICE! Bitsets + Detect + XOR↵
↵
http://mirror.codeforces.com/contest/844/problem/D (5) //NICE! Randomized algo↵
↵
http://mirror.codeforces.com/contest/862/problem/D (4) //NICE! Find first + Binary Search↵
↵
http://mirror.codeforces.com/contest/872/problem/D (4) //NICE! [no clue why it passed]↵
↵
</spoiler>↵
↵
<spoiler summary="isomorphism">↵
↵
UVA 12489 //Tree↵
↵
https://www.hackerrank.com/contests/hourrank-16/challenges/jenny-subtrees/problem↵
↵
http://www.spoj.com/problems/DSUBTREE/ (5) //Isomorphism on trees (try all subsets)↵
↵
http://www.spoj.com/problems/TREEISO/ (4) //Simple isomorphism of trees↵
↵
</spoiler>↵
↵
<spoiler summary="josephus">↵
↵
UVA 151↵
↵
UVA 1394↵
↵
UVA 440↵
↵
3803 [LA]↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/1030↵
↵
UVA 12912↵
↵
UVA 13114↵
↵
11351 UVA (2)↵
↵
http://www.spoj.com/problems/CLSLDR/ (4) //Muchas queries &mdash; go DP↵
↵
</spoiler>↵
↵
<spoiler summary="KMP">↵
↵
http://www.spoj.com/problems/ADAPET/↵
↵
UVA 12604↵
↵
UVA 12467↵
↵
UVA 11019↵
↵
http://www.spoj.com/problems/NAJPF/ (4) //classical kmp &mdash; all patterns↵
↵
http://mirror.codeforces.com/contest/808/problem/G (6) //with DP -harder↵
↵
</spoiler>↵
↵
<spoiler summary="lca">↵
↵
http://www.spoj.com/problems/ADAAPPLE/ [HLD][LCT works too]↵
↵
http://www.spoj.com/problems/ADAVISIT/ [HLD]↵
↵
http://www.spoj.com/problems/ADALICI/ [KTH Ancestor &mdash; FAST!]↵
↵
http://www.spoj.com/problems/ADAORANG/↵
↵
http://www.spoj.com/problems/LCA/ //Easiest one &mdash; low constraints [practice]↵
↵
http://www.spoj.com/problems/LCASQ/↵
↵
http://mirror.codeforces.com/contest/911/problem/F (5) //[VERY NICE][LONGEST PATH]↵
↵
https://devskill.com/CodingProblems/ViewProblem/141↵
↵
UVA 12655↵
↵
https://www.codechef.com/problems/PSHTTR↵
↵
LightOJ 1162↵
↵
Gym 100685G [2012-2013 ACM-ICPC, NEERC, Moscow Subregional Contest]↵
↵
UVA 12533↵
↵
https://www.codechef.com/problems/CLOSEFAR //But kinda more comples [ST]↵
↵
http://mirror.codeforces.com/contest/733/problem/F 7↵
↵
11354 UVA (4)↵
↵
http://www.spoj.com/problems/POLICEMEN/ (3) //simple + small graph↵
↵
http://www.spoj.com/problems/QTREE2/ (5) //very easy if bin. understrood↵
↵
http://mirror.codeforces.com/contest/828/problem/F 7 // Differently MST / Outside↵
↵
http://mirror.codeforces.com/contest/832/problem/D (5) //Classical + Depth /OR/ HLD +ST↵
↵
http://www.spoj.com/problems/DRTREE/ (5) //NICE [finding ancestor + depths]↵
↵
http://mirror.codeforces.com/problemset/problem/838/B (6) //VERY NICE [HLD + ET + ST]↵
↵
http://www.spoj.com/problems/NTICKETS/ (4) //Maximum on path↵
↵
http://www.spoj.com/problems/GRASSPLA/ (5) //HLD↵
↵
http://mirror.codeforces.com/contest/855/problem/D (4) //VERY VERY BAD STATEMENT (not so bad problem)↵
↵
http://mirror.codeforces.com/gym/101630 {L}(6) //[NICE][HLD or DSU][XOR] //Parenthessis↵
↵
</spoiler>↵
↵
<spoiler summary="lcs_subsequence">↵
↵
http://www.spoj.com/problems/ADASEED/ [HUNT]↵
↵
http://www.spoj.com/problems/MC/↵
↵
UVA 10192↵
↵
UVA 531↵
↵
LightOJ 1110↵
↵
UVA 12747 //Perm↵
↵
http://www.spoj.com/problems/XMEN/ //Perm↵
↵
UVA 10405↵
↵
UVA 12511 //Increasing↵
↵
UVA 10635 //Increasing↵
↵
10949 UVA (6) &mdash; Hunt or Bit↵
↵
http://www.spoj.com/problems/MC/ (3) //Classical↵
↵
http://www.spoj.com/problems/LCS0/ (7) //Bit↵
↵
</spoiler>↵
↵
<spoiler summary="lct">↵
↵
http://www.spoj.com/problems/ADAROADS/ [ONLINE][UPDATES][LCT]↵
↵
http://www.spoj.com/problems/DYNALCA/en/ //DYNAMIC LCA ↵
↵
http://mirror.codeforces.com/gym/100460/problem/C↵
↵
http://mirror.codeforces.com/gym/100960/problem/H↵
↵
http://www.spoj.com/problems/DYNACON1/↵
↵
http://mirror.codeforces.com/contest/892/problem/E (7) [VERY NICE]//By prices .. LCT↵
↵
</spoiler>↵
↵
<spoiler summary="lis">↵
↵
UVA 231↵
↵
UVA 10131↵
↵
2931 LA↵
↵
http://www.spoj.com/problems/NDS/↵
↵
UVA 481↵
↵
http://www.spoj.com/problems/ELIS/↵
↵
UVA 497↵
↵
UVA 11790↵
↵
http://www.spoj.com/problems/ALTSEQ/ 3 //solvable by FW in Nlog(N)↵
↵
http://www.spoj.com/problems/VISIBLEBOX/ (4) //with multiset↵
↵
http://www.spoj.com/problems/DOSA/ (5)↵
↵
http://www.spoj.com/problems/CODERE3/ 3 //Low bounds LIS/LDS↵
↵
http://www.spoj.com/problems/BRDGHRD/ 4 //lis (nondecreasing)↵
↵
http://www.spoj.com/problems/GONESORT/ 4 //Permutation-lis + riddle statement↵
↵
http://mirror.codeforces.com/contest/847/problem/B 4 //Multiple Lis's↵
↵
http://mirror.codeforces.com/contest/67/problem/D (4) //[NICE][DOUBLE REMAP]↵
↵
</spoiler>↵
↵
<spoiler summary="matching">↵
↵
http://www.spoj.com/problems/ADAPATH/↵
↵
http://www.spoj.com/problems/ADACITY/↵
↵
http://www.spoj.com/problems/ADAPLNTS/↵
↵
http://www.spoj.com/problems/MATCHING/ //Raw (no sauce)↵
↵
http://www.spoj.com/problems/ADAPLNTS/codeforces.com/contest/116/problem/B (3) //Low cons. Can be done without algo↵
↵
6234 — Tile Cut (LA)↵
↵
10080 — Gopher II (UVA) //Easy — sympathic↵
↵
11419 — SAM I AM (UVA) //Grid-Matching↵
↵
http://mirror.codeforces.com/gym/101485 (Elementary Math — E) //Very nice principal [not that hard]↵
↵
3673 — Black-White Grid (UVA) //Grid↵
↵
12927 — Points Cover (UVA)↵
↵
6851 — The Programmers (LA)↵
↵
6887 — Book Club //NICE↵
↵
6571 — It Can Be Arranged↵
↵
12530 — Game of Tiles↵
↵
http://mirror.codeforces.com/gym/100820 (Airport — A) //Nice one↵
↵
http://mirror.codeforces.com/gym/100753 (Bounty Hunterr II — B) //VERY NICE — I refered multiple times to this principal↵
↵
http://mirror.codeforces.com/gym/101408 (Cat vs Dog — C)↵
↵
1171 — Knights in Chessboard (II) (LOJ) //Classical chess↵
↵
12644 — Vocabulary↵
↵
http://mirror.codeforces.com/gym/101047/problem/H↵
↵
http://mirror.codeforces.com/problemset/problem/659/E↵
↵
12972 — Cuban Challenge (UVA)↵
↵
1201 — Taxi Cab Scheme (UVA)↵
↵
12963 — Astragalus Nitidiflorus↵
↵
6525 — Attacking rooks (LA)↵
↵
3415 — Guardian of Decency (LA)↵
↵
12159 — Gun Fight (UVA)↵
↵
https://www.codechef.com/problems/CHEFYODA //Imho matching is not the crucial part here↵
↵
12831 — Bob the Builder↵
↵
http://mirror.codeforces.com/problemset/problem/831/D↵
↵
11262 — Weird Fence↵
↵
12549 — Sentry Robots↵
↵
11138 — Nuts and Bolts↵
↵
http://mirror.codeforces.com/contest/727/problem/D 4↵
↵
11985 UVA (5)↵
↵
http://www.spoj.com/problems/AMR12A/ (5) //VERY NICE [goophers + bonus] (BS)↵
↵
http://www.spoj.com/problems/NITT4/ (4) //VERY NICE [Chessboard matching]↵
↵
http://www.spoj.com/problems/SCPC11H/ (4)//NICE &mdash; Match those which fits inside↵
↵
</spoiler>↵
↵
<spoiler summary="matrix">↵
↵
12045 UVA (4)↵
↵
</spoiler>↵
↵
<spoiler summary="matrix_exponentiation">↵
↵
http://www.spoj.com/problems/ADAMONEY/↵
↵
http://mirror.codeforces.com/contest/147/problem/B (5) //[NICE][BS][GRAPHS]↵
↵
http://mirror.codeforces.com/contest/107/problem/D (5) //[NICE][DP]↵
↵
UVA 12653↵
↵
LightOJ 1131↵
↵
UVA &mdash; 12470↵
↵
http://mirror.codeforces.com/problemset/problem/696/D↵
↵
https://www.hackerrank.com/contests/mathemagic-bits/challenges/gp-on-fibonacci-matrix [accesable?]↵
↵
https://www.hackerrank.com/contests/mathemagic-bits/challenges/degree-diameter-on-trees [accesable?]↵
↵
LightOJ 1052↵
↵
https://www.codechef.com/problems/KBIGNUMB↵
↵
LightOJ 1160↵
↵
LightOJ 1096↵
↵
UVA 11486↵
↵
http://mirror.codeforces.com/problemset/problem/718/C↵
↵
LightOJ 1070↵
↵
LightOJ 1132↵
↵
http://mirror.codeforces.com/problemset/problem/621/E↵
↵
Project Euler #114: Counting block combinations I↵
↵
http://mirror.codeforces.com/problemset/problem/821/E↵
↵
UVA 12593 ↵
↵
https://www.codechef.com/AUG16/problems/SHAIKHGN //Not exactly but similar principle↵
↵
11551 UVA (4)↵
↵
11486 UVA (5)↵
↵
10743 UVA (5) //A001169 [easy multi / hard to come with recurence]↵
↵
http://mirror.codeforces.com/contest/821/problem/E (6) //Not trivial to come-up with matrix↵
↵
http://www.spoj.com/problems/DCEPCA06/ (4) //NICE &mdash; 10x10 matrix↵
↵
http://www.spoj.com/problems/GSWORDS/ (3) //NICE&EASY &mdash; 3-states "OO,OX,XO"↵
↵
http://www.spoj.com/problems/TETRAHRD/ (4) //Easy + Sum↵
↵
http://www.spoj.com/problems/NACCI/ (4) //Classical (N-Bonacci)↵
↵
http://www.spoj.com/problems/JZPCIR/ (5) //VERY NICE: A137726↵
↵
</spoiler>↵
↵
<spoiler summary="mcmf">↵
↵
http://www.spoj.com/problems/ADAGROW/↵
↵
http://www.spoj.com/problems/ADAFEAR/↵
↵
http://mirror.codeforces.com/gym/100800 (Aqueduct Construction — A)↵
↵
10806 — Dijkstra, Dijkstra.↵
↵
12944 — Earthquake Disaster↵
↵
12891 — Risk of Trading↵
↵
https://www.codechef.com/problems/HOGON↵
↵
http://mirror.codeforces.com/contest/863/problem/F (5) //VERY NICE↵
↵
11613 UVA (6)↵
↵
http://mirror.codeforces.com/contest/802/problem/C (8) //Nice but hard to see + negative↵
↵
http://mirror.codeforces.com/contest/802/problem/N (5) //Easy but faster MCMF needed↵
↵
http://mirror.codeforces.com/contest/818/problem/G (6) //NICE + MUCH Faster MCMF↵
↵
http://www.spoj.com/problems/BNMT/ (7) //VERY NICE (some optimalisations needed + weird data set)↵
↵
http://mirror.codeforces.com/contest/884/problem/F (6) //Alphabetical buckets↵
↵
</spoiler>↵
↵
<spoiler summary="median">↵
↵
http://mirror.codeforces.com/contest/713/problem/C 7↵
↵
http://www.spoj.com/problems/RMID2/ 4↵
↵
http://www.spoj.com/problems/RMID/ 3 (as above just not so dynamic)↵
↵
http://www.spoj.com/problems/EC_ESTA/ 4 //classical dynamic median↵
↵
http://www.spoj.com/problems/DCEPCA09/ (6) //VERY NICE [MO +++ MEDIAN, MEAN, FREQ]↵
↵
</spoiler>↵
↵
<spoiler summary="meet_in_middle">↵
↵
http://mirror.codeforces.com/contest/888/problem/E (4) //NICE[EASY]↵
↵
http://mirror.codeforces.com/contest/51/problem/E (6) //NICE[GRAPH][Cycles of length 5]↵
↵
https://devskill.com/CodingProblems/ViewProblem/245↵
↵
https://devskill.com/CodingProblems/ViewProblem/256↵
↵
11851 UVA (5)↵
↵
11465 UVA (5)↵
↵
13207 UVA (4) //Straight-forward MIM↵
↵
http://www.spoj.com/problems/COLOR_CC/ (4) //VERY NICE &mdash; div by partity (take lesser) → 8^6↵
↵
</spoiler>↵
↵
<spoiler summary="MO">↵
↵
http://www.spoj.com/problems/ADAUNIQ/ [Updates]↵
↵
http://www.spoj.com/problems/ADANUM/↵
↵
http://www.spoj.com/problems/ADAPEAR/↵
↵
http://www.spoj.com/problems/ADAPHONE/↵
↵
http://www.spoj.com/problems/ADAFTBLL/ [Tree][Updates]↵
↵
http://www.spoj.com/problems/FREQUENT/↵
↵
http://mirror.codeforces.com/contest/86/problem/D (4) //[NICE][CLASSICAL]↵
↵
http://mirror.codeforces.com/contest/877/problem/F (6) //[NICE][NORMALIZE]↵
↵
http://mirror.codeforces.com/problemset/problem/687/D↵
↵
http://mirror.codeforces.com/problemset/problem/617/E↵
↵
http://www.spoj.com/problems/DCEPCA09/↵
↵
http://www.spoj.com/problems/COT2/↵
↵
https://www.codechef.com/problems/DISTNUM3 //Tree + Update↵
↵
https://toph.ws/p/distinct-dishting //Not sure if still working??↵
↵
https://www.codechef.com/problems/CHEFNUMK↵
↵
https://www.hackerearth.com/problem/algorithm/harry-gets-into-infy-1/description/↵
↵
http://www.spoj.com/problems/COT/ (7) //ON TREE [but very tight TLE]↵
↵
http://www.spoj.com/problems/GOT/ (5) //ON TREE ↵
↵
http://www.spoj.com/problems/CPAIR2/ (4) //MO + Fenwick [VERY NICE]↵
↵
http://www.spoj.com/problems/HRSIAM/ (5) //With updates↵
↵
http://www.spoj.com/problems/KDOMINO/ (4) //NICE &mdash; Frequencies↵
↵
</spoiler>↵
↵
<spoiler summary="next">↵
↵
13257 &mdash; License Plates [UVA](3) //Brute-Force 26^3 queries in O(1)↵
↵
http://mirror.codeforces.com/contest/92/problem/C (3) //[VERY NICE]↵
↵
LightOJ 1157↵
↵
https://www.codechef.com/problems/ASTRING↵
↵
http://www.spoj.com/problems/MAIN8_E/↵
↵
http://mirror.codeforces.com/problemset/problem/701/C ↵
↵
http://www.spoj.com/problems/STRSEQ/ //+DP↵
↵
http://mirror.codeforces.com/problemset/problem/762/C↵
↵
http://mirror.codeforces.com/problemset/problem/724/D↵
↵
http://www.spoj.com/problems/SUBSN/ //+BS↵
↵
https://www.hackerrank.com/contests/world-codesprint-5/challenges/short-palindrome //+DP↵
↵
</spoiler>↵
↵
<spoiler summary="np-hard">↵
↵
http://www.spoj.com/problems/ADACROW↵
↵
http://www.spoj.com/problems/ADAPARTY/↵
↵
http://www.spoj.com/problems/ADAPARTI/↵
↵
http://www.spoj.com/problems/JOHNNY/ //Not exact &mdash; points↵
↵
http://mirror.codeforces.com/contest/839/problem/E (5) //NICE! Max-Cliquecodeforces.com/contest/907/problem/E (5) //[VERY NICE][CLIQUE][DP]↵
↵
http://mirror.codeforces.com/contest/114/problem/B (3) //[CLIQUE][BRUTE-FORCE]↵
↵
http://www.spoj.com/problems/JOHNNY/ //Not exact &mdash; points↵
↵
http://www.spoj.com/problems/TAKIN/ (3) //[KNAPSACK][RECURSION]↵
↵
http://mirror.codeforces.com/contest/839/problem/E (5) //NICE! Max-Clique↵
↵
7743 &mdash; Cliques (Similar to ADAPARTI) (8) //Parametrisation↵
↵
7616 Counting Cliques (4) //[NICE][CLIQUES][ELIMINATING-SETS]↵
↵
</spoiler>↵
↵
<spoiler summary="number_rectangle">↵
↵
UVA 10667 //Largest rectangle↵
↵
UVA 10074 //Largest rectangle↵
↵
UVA 836 //Largest rectangle↵
↵
UVA 1330 //Largest rectangle↵
↵
12192 UVA 5↵
↵
http://mirror.codeforces.com/contest/729/problem/B 2↵
↵
http://mirror.codeforces.com/contest/710/problem/C 4↵
↵
11871 UVA 6↵
↵
11617 UVA (3)↵
↵
11573 UVA (4)↵
↵
11499 UVA (5)↵
↵
11230 UVA (4)↵
↵
http://www.spoj.com/problems/JOCHEF/ (5) //NICE: Lagers rectange 0/1 O(N*M)↵
↵
</spoiler>↵
↵
<spoiler summary="number_theory">↵
↵
http://www.spoj.com/problems/ADAGCD/ [+STL]↵
↵
http://www.spoj.com/problems/ADAHACK/↵
↵
http://www.spoj.com/problems/ADADUNG/↵
↵
http://www.spoj.com/problems/ADACAROT/↵
↵
http://www.spoj.com/problems/ADACON/↵
↵
http://www.spoj.com/problems/ADATAXES/↵
↵
http://www.spoj.com/problems/ADADIG/↵
↵
http://www.spoj.com/problems/ADASETS/↵
↵
http://www.spoj.com/problems/JGTLE/ (3) //Sum reduction↵
↵
http://www.spoj.com/problems/BAPM/ (3) //Simple power / Observe, rare colisions↵
↵
http://mirror.codeforces.com/contest/911/problem/C (2) //[Observation][Iff (or brute-froce)]↵
↵
http://mirror.codeforces.com/contest/133/problem/B (2) //Bases + implementation↵
↵
http://mirror.codeforces.com/contest/129/problem/A (1) //Parity↵
↵
http://mirror.codeforces.com/contest/124/problem/D (4) ↵
↵
http://mirror.codeforces.com/contest/125/problem/A (1) //mod/div simple &mdash; if↵
↵
http://mirror.codeforces.com/contest/902/problem/D (4) //Polynomials / Fibonacci / Bitset↵
↵
http://mirror.codeforces.com/contest/899/problem/D (4) //X99999 possibilities↵
↵
http://mirror.codeforces.com/contest/899/problem/C (3) //[NICE][GREEDY KNAPSACK]↵
↵
http://mirror.codeforces.com/contest/899/problem/A (1)↵
↵
http://mirror.codeforces.com/contest/898/problem/A (1)↵
↵
http://mirror.codeforces.com/gym/101620 {F}(4) //[IFS][INVERSE][CASES]↵
↵
http://mirror.codeforces.com/contest/900/problem/D (4) //[NICE][DIVISORS][GCD][IE]↵
↵
http://mirror.codeforces.com/contest/900/problem/B (2) //Cycles or Brute-force + Division↵
↵
http://mirror.codeforces.com/contest/119/problem/A (2) //[EASY][GCD]↵
↵
8014 &mdash; Birthday Pizza Party (4) //[NICE][OVERFLOW][LCM WITH SHIFT]↵
↵
7629 &mdash; Powers (3) //One path is factorisation↵
↵
8037 &mdash; Military Service (2) //Sample formula↵
↵
8085 &mdash; Divisors (4) //[NICE][PRIMES/FACTORISATION/SIEVE]↵
↵
6589 &mdash; Captain Obvious and the Rabbit-Man (7) //Sylvester's formula↵
↵
6582 &mdash; Magical GCD (4) //[NICE] &mdash; Data structures works too↵
↵
8000 &mdash; FizzBuzz (1)↵
↵
https://devskill.com/CodingProblems/ViewProblem/421 (2) //6 buckets↵
↵
http://mirror.codeforces.com/contest/93/problem/E (5) //[VERY NICE][DP][RECURSION]↵
↵
http://mirror.codeforces.com/contest/86/problem/A (3) //[NICE] 50* is best (unless more digits)↵
↵
http://mirror.codeforces.com/contest/83/problem/D (5) //[VERY NICE][PRIMES][BRUTE-FORE-2]↵
↵
http://mirror.codeforces.com/contest/82/problem/A (2) //Simulation↵
↵
http://mirror.codeforces.com/contest/74/problem/C (4) //gcd↵
↵
http://mirror.codeforces.com/contest/76/problem/E (4) //Divide sumations [BF]↵
↵
http://mirror.codeforces.com/contest/71/problem/C (3) //[EASY][NICE][BRUTE-FORCE][DIVISORS]↵
↵
http://mirror.codeforces.com/contest/70/problem/A (2) //3^(N-1)↵
↵
http://mirror.codeforces.com/contest/43/problem/C (2) //Moduly by 3 {0/2+min(1,2)}↵
↵
http://mirror.codeforces.com/contest/50/problem/A (1) //[EASY]↵
↵
http://mirror.codeforces.com/contest/61/problem/C (4) //Base conversion + roman↵
↵
UVA 355 //bases conversion↵
↵
2559 [LA] //Base conversion↵
↵
https://www.codechef.com/problems/COPRIME3 //Cyka Möbius↵
↵
http://www.spoj.com/problems/PSTR/ //Cyka Möbius↵
↵
http://mirror.codeforces.com/problemset/problem/803/F //Cyka Möbius↵
↵
https://devskill.com/CodingProblems/ViewProblem/23↵
↵
http://mirror.codeforces.com/contest/731/problem/F 4↵
↵
12031 UVA (8)↵
↵
http://mirror.codeforces.com/contest/722/problem/F (8)↵
↵
http://mirror.codeforces.com/contest/716/problem/C 4↵
↵
http://mirror.codeforces.com/contest/711/problem/E (8)↵
↵
http://mirror.codeforces.com/contest/710/problem/D (6)↵
↵
13154 (UVA) 7↵
↵
13166 (UVA) 5↵
↵
11962 (UVA) 2↵
↵
11718 UVA 3↵
↵
11510 UVA (5)↵
↵
11538 UVA (3) //good one &mdash; just math↵
↵
11556 UVA (1)↵
↵
http://mirror.codeforces.com/contest/757/problem/E (8)↵
↵
http://mirror.codeforces.com/contest/758/problem/F (7)↵
↵
11481 UVA (4)↵
↵
11237 UVA (4) //Nice &mdash; seems like knapsbag but it it not↵
↵
11155 UVA (4) //Almost as previous problem↵
↵
11038 UVA (3) //counting digits on interval↵
↵
http://mirror.codeforces.com/contest/763/problem/C (7)↵
↵
11087 UVA (4) //Sums of two numbers divisible with <=500 (10^5)↵
↵
http://mirror.codeforces.com/contest/678/problem/C 2 //LCM↵
↵
http://mirror.codeforces.com/problemset/problem/665/F (8) //p^3 | p*q↵
↵
http://www.spoj.com/problems/LCMSUM/ //Vzorec v knihovničce↵
↵
http://www.spoj.com/problems/FRNDZND/ (2) // (size 1 == 1, else 0)↵
↵
http://www.spoj.com/problems/EXPOR/ //bit-by-bit (+ formula)↵
↵
http://www.spoj.com/problems/FACTDIV/ (5) //dyn-update of ans/factors GOOD↵
↵
http://www.spoj.com/problems/PAIRDIV/ (6) //cyka möbius -_-↵
↵
http://www.spoj.com/problems/FCDC/ (4) //keep factorized factorial ↵
↵
http://www.spoj.com/problems/NTHPRIME/ (7) // BS + NumPrime GOOD!!↵
↵
http://www.spoj.com/problems/DIVFACT3/ (7) // Sieve 10^8 + sqrt search↵
↵
http://www.spoj.com/problems/DIVFACT4/ (8) // Prime count↵
↵
http://mirror.codeforces.com/contest/776/problem/C (4) //segments div. by number↵
↵
http://mirror.codeforces.com/contest/776/problem/E (6) //vypsat cisla: f(N)=Phi(N),g(N)=N↵
↵
http://www.spoj.com/problems/PHT/ (2) //easy BS (NN+2N) mby math?↵
↵
http://www.spoj.com/problems/GCDEX/ (7) //OEIS A006579  &mdash; enough [well imp]↵
↵
http://www.spoj.com/problems/APS/ (3) //just sieve + generate↵
↵
http://www.spoj.com/problems/WPC5I/ (3)//fc: C[a]!=C[b]:F[a]^max(C[a],C[b])↵
↵
http://www.spoj.com/problems/SPEC_SET/ N→N/k→N/k/k↵
↵
http://www.spoj.com/problems/DCEPC11B/ (5) //Wilson't theorem!↵
↵
http://www.spoj.com/problems/FACTMULN/ (5) //each f[i]/c[i] separately↵
↵
http://www.spoj.com/problems/SPCM/ (4) //just factorisation + prime check (10^12)↵
↵
http://www.spoj.com/problems/TWOGAME/ (5) //gcd == Power of 3 => YES↵
↵
http://www.spoj.com/problems/MKEQUAL/ (2) //Chceck if sum is divisible by N↵
↵
http://www.spoj.com/problems/TIPTOP/ (3) //sqrt(N)==N? NICE!!↵
↵
http://www.spoj.com/problems/PSYCHON/ (4) // fast factorisation↵
↵
http://www.spoj.com/problems/ENIGMATH/ (1) // swap and div by gcd↵
↵
http://www.spoj.com/problems/SNGPG/ (3) // prime gen + check↵
↵
http://mirror.codeforces.com/contest/795/problem/A (2) //brute-force↵
↵
http://mirror.codeforces.com/contest/801/problem/E (6) //NICE! &mdash; Clique-DAG + inversion↵
↵
http://mirror.codeforces.com/contest/798/problem/C (4) //GCD == at the beginning OR 2↵
↵
http://mirror.codeforces.com/contest/803/problem/C (3) //Only "low" K and just divisors↵
↵
10830 (4) //simple add 2→ sqrt(N) + their mirrors↵
↵
http://mirror.codeforces.com/contest/817/problem/A (2) //check division + parity↵
↵
13209 UVA (3) //Simple simulation of division (+states rememberance)↵
↵
http://mirror.codeforces.com/contest/834/problem/C (4) //Has cube-root + both num divisible by cuberoot↵
↵
http://mirror.codeforces.com/contest/837/problem/E (5) //Factorisation + GCD attributes↵
↵
http://www.spoj.com/problems/SUMMATION/ (3) //Number contribution: 2^(N-1)↵
↵
http://www.spoj.com/problems/SECTORS/ (4) //Odd len OR sum of odd indices == sum of even↵
↵
http://www.spoj.com/problems/IITKWPCM/ (6) //VERY NICE &mdash; Gauss's generalisation of Wilsons Theorem↵
↵
http://www.spoj.com/problems/UCV2013A/ (4) //N*(N^L-1)/(N-1)↵
↵
http://www.spoj.com/problems/KIMO1/ (4) //NICE &mdash; Adding/Subing by modulus↵
↵
http://www.spoj.com/problems/AFS2/ (4) //Sum of divisort (sqrt(N)) &mdash; (+128int)↵
↵
http://www.spoj.com/problems/FUNNUMS/ (4) //Permutations (get ith + guess ith)↵
↵
http://www.spoj.com/problems/MAY99_3/ (3) //GCD↵
↵
http://www.spoj.com/problems/PUCMM334/ (3) //Classical hats problem↵
↵
http://www.spoj.com/problems/LCPC11B/ (4) //Factorize + count all subsets↵
↵
http://www.spoj.com/problems/THREENUMBERS/ (2) //EASY & NICE [lcm]↵
↵
http://www.spoj.com/problems/GAMES/ (2) //EASY&NICE &mdash; Go discrete (by 10^k) → 10^k/GCD↵
↵
http://www.spoj.com/problems/SUBSHARD/ (4) //dig*10^sufix*(choose sufix)*^Prefix [VERY NICE]↵
↵
http://www.spoj.com/problems/INVDIV/ (6) //Sum of divisors function + factorisation [NICE]↵
↵
http://www.spoj.com/problems/JNEXT/ (2) //EASY &mdash; Zahřívačka pro prváky↵
↵
http://www.spoj.com/problems/TSHOW1/ (3) //NICE &mdash; Almost as binary repre with 5/6↵
↵
http://mirror.codeforces.com/contest/859/problem/B (2) //Easy by iteration↵
↵
http://mirror.codeforces.com/contest/861/problem/A (2) //5,2 division [EASY]↵
↵
http://www.spoj.com/problems/ABA12D/ (4) //NICE &mdash; Formula for sum divisors Prod(Sum(fac-powers))↵
↵
http://www.spoj.com/problems/MAIN74/ (3) //Fibo's↵
↵
http://www.spoj.com/problems/NOSQ/ (3) //Sieve + Digit check↵
↵
http://www.spoj.com/problems/SQUAREV1/ (3) //NICE (but dumb code limit)↵
↵
http://mirror.codeforces.com/contest/597/problem/A (1) //Simple if+2*Divide↵
↵
http://www.spoj.com/problems/STREETR/ (3) //Easy [GCD]↵
↵
http://www.spoj.com/problems/HPYNOSII/ (3) //<=1000 after first move↵
↵
http://www.spoj.com/problems/HPYNOS/ (1) //Same as above &mdash; 1 number↵
↵
http://www.spoj.com/problems/IITD4/ (3) //Brute-force [sieve-like]↵
↵
http://www.spoj.com/problems/GIRLSNBS/ (2) //Some easy formula↵
↵
http://www.spoj.com/problems/GUESSTHE/ (2) //NICE [EASY][LCM]↵
↵
http://mirror.codeforces.com/contest/867/problem/B (2) //NICE [observation][1 2]↵
↵
http://www.spoj.com/problems/NDIVPHI/ (4) //NICE &mdash; Multiple of lowest primes [BIG-INT]↵
↵
http://www.spoj.com/problems/NDIVPHI2/ (5) //NICE &mdash; Same as above [bigger constraints]↵
↵
http://mirror.codeforces.com/contest/6/problem/A (1) //Triangle check (4 pts)↵
↵
http://mirror.codeforces.com/contest/869/problem/B (1) //Answer is usually 0↵
↵
http://mirror.codeforces.com/contest/9/problem/C (2) //Bases (2→ 10)↵
↵
http://mirror.codeforces.com/contest/20/problem/B (2) //Ax^2+Bx+C=0 (find roots)↵
↵
http://mirror.codeforces.com/contest/27/problem/E (5) //[VERY NICE]: Factorisation+Recursion↵
↵
http://mirror.codeforces.com/contest/32/problem/C (3) //DSU works too↵
↵
http://mirror.codeforces.com/contest/872/problem/C (3) //NICE &mdash; Compose of 4 (mby one  6 or 9)↵
↵
http://mirror.codeforces.com/contest/876/problem/B (3) //Group by modulo↵
↵
</spoiler>↵
↵
<spoiler summary="observation">↵
↵
http://www.spoj.com/problems/ADABANKET/ //Observation (but Stoer-Wagner works too)↵
↵
http://mirror.codeforces.com/contest/892/problem/D (4) //NICE [SORTING]911/problem/D (3) //[VERY NICE]↵
↵
http://mirror.codeforces.com/contest/902/problem/E (5) //[VERY NICE] //LCT works too↵
↵
7589 Rearranging a Sequence (3) //Print from back and then real↵
↵
http://mirror.codeforces.com/gym/101630 {A}(6) //[NICE][STL]↵
↵
http://mirror.codeforces.com/contest/122/problem/B (1) //just 4 or 7↵
↵
http://mirror.codeforces.com/contest/116/problem/E (6) //[NICE][COMBINATORICS][FIND ANY]↵
↵
http://mirror.codeforces.com/contest/892/problem/D (4) //NICE [SORTING]↵
↵
http://mirror.codeforces.com/contest/897/problem/E (5) //[NICE][SET] //2 will beat all↵
↵
7730 To begin or not to begin (3) //Parity↵
↵
http://mirror.codeforces.com/contest/122/problem/D (4) //[NICE] Sweep /OR/ cycle↵
↵
http://mirror.codeforces.com/contest/128/problem/D (6) //Normalize + Sweeps↵
↵
</spoiler>↵
↵
<spoiler summary="oeis">↵
↵
6591 &mdash; Bus (2) //2^N-1↵
↵
12004 UVA 2↵
↵
11273 UVA 5 //https://oeis.org/A001088↵
↵
11077 UVA 3 //https://oeis.org/A094638↵
↵
http://www.spoj.com/problems/VECTAR5/ 3 //https://oeis.org/A038721↵
↵
http://www.spoj.com/problems/ESYRCRTN/ 2 //generate and see↵
↵
http://www.spoj.com/problems/IITWPC4B/ 3 //http://oeis.org/A005044↵
↵
http://www.spoj.com/problems/POLCONST/ (4) //A003401+Fermat Number (Prime)↵
↵
http://www.spoj.com/problems/CUTCAKE/ (3) // pattern [1 22 333 4444 55555]↵
↵
10872 UVA 3 //Alcuin's Sequence↵
↵
http://www.spoj.com/problems/LOVINGPW/ (3) //A000788↵
↵
http://www.spoj.com/problems/CBANK/ (3) //A000292 Tetrahedral numbers↵
↵
http://www.spoj.com/problems/GUMATH2/ (4) //A000240 Modulo by MOD*2↵
↵
http://www.spoj.com/problems/MATHII/ (4) //A006218  (Two formulas => sqrt(N))↵
↵
http://www.spoj.com/problems/KOPC12B/ (4) //A002457 (factorial + factorial modular)↵
↵
http://www.spoj.com/problems/YUMMY/ (4) //A006534 ↵
↵
http://www.spoj.com/problems/ADV04B1/ (5) //A001850↵
↵
http://www.spoj.com/problems/FLWRS/ (4) //A002464↵
↵
http://www.spoj.com/problems/RANJAN02/ (3) //A024023↵
↵
http://www.spoj.com/problems/BOMARBLE/ (2) //A000326↵
↵
http://mirror.codeforces.com/contest/57/problem/C (4) //A045992↵
↵
</spoiler>↵
↵
<spoiler summary="offline">↵
↵
http://www.spoj.com/problems/ADARAIN/↵
↵
http://www.spoj.com/problems/ADARAINB/↵
↵
http://www.spoj.com/problems/ADAROBOT/↵
↵
http://mirror.codeforces.com/problemset/problem/816/B //Easier ST↵
↵
11266 UVA (6) //slightly knapsack || [NICE]↵
↵
http://mirror.codeforces.com/contest/761/problem/F (7)↵
↵
http://www.spoj.com/problems/UPDATEIT/ (2) //basic method↵
↵
13189 UVA (4) //simulation + sort queries↵
↵
http://www.spoj.com/problems/HAYBALE/ (3) //Basic sum + sort (segment tree would work too)↵
↵
http://mirror.codeforces.com/gym/101597/problem/H (6) //Offline 2D sum + geometry↵
↵
</spoiler>↵
↵
<spoiler summary="palindromes">↵
↵
http://mirror.codeforces.com/contest/897/problem/B (2) //Palindromic numbers [EASY][FIRST]↵
↵
http://mirror.codeforces.com/contest/883/problem/H (3) //Make as least odd as possible↵
↵
http://code-festival-2017-qualc.contest.atcoder.jp/tasks/code_festival_2017_qualc_c (3) //Similar to remove-dp, but greedy↵
↵
http://code-festival-2017-qualc.contest.atcoder.jp/tasks/code_festival_2017_qualc_d (4) //DP with greedy thinking↵
↵
http://mirror.codeforces.com/contest/59/problem/C (3) //Implementation [constructive]↵
↵
UVA 13092 //manacher↵
↵
http://www.spoj.com/problems/MSUBSTR/ //manacher↵
↵
UVA 11888 //manacher↵
↵
https://www.hackerrank.com/contests/101hack35/challenges/circular-palindromes //manacher↵
↵
UVA 12378 //manacher↵
↵
https://www.hackerrank.com/contests/world-codesprint-5/challenges/challenging-palindromes //SA↵
↵
http://www.spoj.com/problems/NUMOFPAL/ //Palindromic Tree↵
↵
http://mirror.codeforces.com/problemset/problem/245/H //# of palindromes [DP]↵
↵
http://www.spoj.com/problems/ANAGR/ 2 //frequency + palindromes↵
↵
http://www.spoj.com/problems/AMR12D/ (1) //Palindrome check //Zahrivacka pro prvaky↵
↵
http://mirror.codeforces.com/problemset/problem/835/D //Hashing↵
↵
http://mirror.codeforces.com/contest/137/problem/D (4) //[NICE][DP]↵
↵
</spoiler>↵
↵
<spoiler summary="patter-matching">↵
↵
11019 UVA (5)↵
↵
</spoiler>↵
↵
<spoiler summary="permutations">↵
↵
http://mirror.codeforces.com/contest/137/problem/B (1) //Frequency + size↵
↵
http://mirror.codeforces.com/contest/136/problem/A (1) //Permutation cycles↵
↵
http://mirror.codeforces.com/contest/844/problem/C 3 //NICE Permutations in array↵
↵
http://mirror.codeforces.com/contest/48/problem/D (3) //NICE [frequency array]↵
↵
http://mirror.codeforces.com/contest/56/problem/B (2) //Restore from 1 reverse [EASY]↵
↵
http://mirror.codeforces.com/contest/122/problem/D (5) //NICE [BRUTE-FORCE]//ONLY BACK MATTERS↵
↵
</spoiler>↵
↵
<spoiler summary="persistent_segment_tree">↵
↵
http://mirror.codeforces.com/contest/893/problem/F (6) //[VERY NICE][EULER TOUR]↵
↵
http://mirror.codeforces.com/contest/813/problem/E (6) //Easy but hard data structure↵
↵
</spoiler>↵
↵
<spoiler summary="preprocess">↵
↵
http://www.spoj.com/problems/ADAPLUS/↵
↵
http://www.spoj.com/problems/ADASQR/ [Monotone Queue]↵
↵
http://mirror.codeforces.com/contest/120/problem/D (3) //But maybe work naively ?!↵
↵
http://mirror.codeforces.com/contest/48/problem/B (2) //2D Prefix Sum [BF prolly works too]↵
↵
http://mirror.codeforces.com/problemset/problem/761/F↵
↵
UVA 10360 //2D Prefix Sum↵
↵
UVA 983 //2D Prefix Sum↵
↵
http://mirror.codeforces.com/contest/777/problem/C (4) //NICE↵
↵
http://mirror.codeforces.com/contest/818/problem/C (4) //Prefix Sum↵
↵
http://mirror.codeforces.com/contest/834/problem/B (2) //26 queries &mdash; NICE rozehrivacka pro prvaky↵
↵
http://www.spoj.com/problems/RANGESUM/ (4) //NICE: Offline (delta) + Prefix Sum↵
↵
http://www.spoj.com/problems/RANDG/ (3) //NICE [but too low bounds] [PrefixSum] [Try all indexes]↵
↵
http://www.spoj.com/problems/HARSHAD/ (3) //Sieve + simple function↵
↵
http://www.spoj.com/problems/PUCMM210/ (3) //Number theory (thinking not necessary)↵
↵
http://www.spoj.com/problems/BCAKE/ (3) //Prefix sum of rectangle + N^4↵
↵
http://www.spoj.com/problems/PAIRSUM/ (4) //VERY NICE &mdash; Prefix sum + Prefix PW sum↵
↵
http://www.spoj.com/problems/MAIN111/ (3) //Sieve + Brute Force (answer in O(1))↵
↵
http://www.spoj.com/problems/PLUSEVI/ (4) //NICE &mdash; There are not many of them↵
↵
http://mirror.codeforces.com/contest/18/problem/C (2) //Prefix sum End==2*i↵
↵
http://mirror.codeforces.com/contest/873/problem/B (2) //Search for same prefix (+/-1)↵
↵
http://mirror.codeforces.com/contest/33/problem/C (4) //Prefix sum + Sweep from back + sweep from front↵
↵
http://mirror.codeforces.com/contest/872/problem/B (3) //Sweep from both sides (RMQ works too)↵
↵
</spoiler>↵
↵
<spoiler summary="prime-count">↵
↵
http://www.spoj.com/problems/NTHPRIME/↵
↵
http://www.spoj.com/problems/DIVFACT4/↵
↵
http://mirror.codeforces.com/problemset/problem/665/F↵
↵
https://www.codechef.com/problems/CNTPRIME↵
↵
http://www.spoj.com/problems/SUMPRIM1/↵
↵
http://www.spoj.com/problems/SUMPRIM2/ [NO &mdash; hard]↵
↵
https://www.hackerrank.com/contests/projecteuler/challenges/euler010/problem //easy↵
↵
</spoiler>↵
↵
<spoiler summary="prime-testing">↵
↵
http://www.spoj.com/problems/ADAGIFT/↵
↵
http://www.spoj.com/problems/PON/en/↵
↵
http://www.spoj.com/problems/DAYOUT2C/en/ [EASY]↵
↵
Project Euler #60: Prime pair sets↵
↵
Project Euler #58: Spiral primes↵
↵
Project Euler #131: Prime cube partnership↵
↵
https://devskill.com/CodingProblems/ViewProblem/229↵
↵
https://devskill.com/CodingProblems/ViewProblem/327↵
↵
Gym 100753K [2015 German Collegiate Programming Contest (GCPC 15) + POI 10-T3]↵
↵
Project Euler #130: Composites with prime repunit property↵
↵
http://www.spoj.com/problems/ABA12A/ (3)↵
↵
10871 UVA (3) //Easy &mdash; fermat not necessary↵
↵
http://www.spoj.com/problems/POP1/ (4) //Fast primality testing (or somehow)↵
↵
http://www.spoj.com/problems/POP2/ (5) //NICE &mdash; same as above (yet with ll)↵
↵
http://www.spoj.com/problems/POP3/ (6) //same as above (yet with big)↵
↵
http://www.spoj.com/problems/DCEPC203/ (6) //NICE [optimalisation]↵
↵
http://www.spoj.com/problems/PRIMPERM/ (4) //NICE (next_perm + sieve)↵
↵
</spoiler>↵
↵
<spoiler summary="probability">↵
↵
http://mirror.codeforces.com/contest/908/problem/D (5) //[DP][MATH][INVERSION]↵
↵
7821 &mdash; Elections (4) //[EASY][DP]↵
↵
http://mirror.codeforces.com/gym/101620 {G}(5) //[VERY NICE][DIJKSTRA][EXPECTED VALUE]↵
↵
http://mirror.codeforces.com/contest/110/problem/D (4) //[NICE][COMBINATORICS]↵
↵
http://mirror.codeforces.com/contest/108/problem/D (4) //[NICE][SIMPLE][COMBINATORICS]↵
↵
7619 &mdash; Guessing the Dice Roll (5) //[NICE][AHO][MATRIX EXPO]↵
↵
7998 &mdash; Election (3) //Math works too [probability][DP]↵
↵
LightOJ 1104 //Birthday Paradox↵
↵
Gym 101064K [2016 USP Try-outs] //Birthday Paradox↵
↵
11762 UVA (5)↵
↵
11427 UVA (5)↵
↵
11348 UVA (2)↵
↵
http://mirror.codeforces.com/contest/768/problem/D (4) //With DP↵
↵
http://www.spoj.com/problems/IITWPC4J/ (4) //with DP↵
↵
10828 UVA (5) //Nice problem but bad statemend: Expected value of visits MC↵
↵
10777 UVA (4) //NICE &mdash; yet solvable with DP↵
↵
http://mirror.codeforces.com/contest/839/problem/C (3) //NICE & Easy => Tree↵
↵
http://www.spoj.com/problems/ZCR/ (3) //Easy (+DP)↵
↵
http://www.spoj.com/problems/IITKWPCN/ (2) //Easy &mdash; Odd/Eve (black balls)↵
↵
http://mirror.codeforces.com/contest/846/problem/F (5) // Expected number of unique elements↵
↵
http://www.spoj.com/problems/BTCODE_H/ (4) //DP (but main GROW is idea)↵
↵
http://mirror.codeforces.com/contest/867/problem/D (5) //VERY NICE [DP]↵
↵
http://mirror.codeforces.com/contest/24/problem/D (5) //VERY NICE [DP]+[TIME]↵
↵
http://mirror.codeforces.com/contest/28/problem/C (4) //VERY NICE [DP]↵
↵
</spoiler>↵
↵
↵
<spoiler summary="recursion">↵
↵
http://mirror.codeforces.com/contest/134/problem/B (4) //Number Theory↵
↵
http://mirror.codeforces.com/contest/897/problem/C (4) //+Slightly [DP]↵
↵
6585 &mdash; Draughts (4) //[NICE][BACKTRACK][DFS]↵
↵
http://mirror.codeforces.com/contest/68/problem/D (5) //[NICE] Keep max and kill branches↵
↵
UVA 536 //Tree from dfs↵
↵
UVA 12347 //BST from preorder↵
↵
http://www.spoj.com/problems/GOC11A/ 4↵
↵
13170 UVA (7) //heavy implementation &mdash; but NICE!↵
↵
10854 UVA (3) //if/else↵
↵
http://mirror.codeforces.com/contest/31/problem/D (4) //[NICE] Brute-force by recursion↵
↵
http://mirror.codeforces.com/contest/36/problem/B (2) //[NICE][SIMPLE]↵
↵
</spoiler>↵
↵
<spoiler summary="RMQ">↵
↵
http://mirror.codeforces.com/problemset/problem/514/D //+BS↵
↵
http://mirror.codeforces.com/problemset/problem/872/B↵
↵
http://www.spoj.com/problems/TNVFC1M/↵
↵
https://devskill.com/CodingProblems/ViewProblem/19↵
↵
http://mirror.codeforces.com/contest/713/problem/D 6↵
↵
http://mirror.codeforces.com/contest/675/problem/E 5↵
↵
http://www.spoj.com/problems/POSTERIN/ 5 //VERY NICE &mdash; Delete all minimas↵
↵
http://www.spoj.com/problems/RPLN/ (3) //RMQ only↵
↵
http://www.spoj.com/problems/CITY2/ (4) //RMQ + MAP [NICE][VAGUE STATEMENT]↵
↵
http://www.spoj.com/problems/DIFERENC/ (4) //Solve separately (linear D&C)↵
↵
http://mirror.codeforces.com/contest/863/problem/E (4) //OR some Queue / sorting↵
↵
http://mirror.codeforces.com/contest/5/problem/C (4) //NICE &mdash; many other options↵
↵
http://mirror.codeforces.com/contest/15/problem/D (5) //VERY NICE 2D RM  [sliding-windw][monotone-queue]↵
↵
http://mirror.codeforces.com/contest/873/problem/E (5) //[NICE][Brute-Force + RMQ]↵
↵
</spoiler>↵
↵
<spoiler summary="rope">↵
↵
http://www.spoj.com/problems/AROPE/ 4↵
↵
http://www.spoj.com/problems/AROPE2/ 5 //same as above (+time)↵
↵
</spoiler>↵
↵
<spoiler summary="scc">↵
↵
http://www.spoj.com/problems/ADAPANEL/ [combinatorics]↵
↵
http://mirror.codeforces.com/contest/894/problem/E (5) //[NICE][DP]↵
↵
https://devskill.com/CodingProblems/ViewProblem/79↵
↵
UVA 11838↵
↵
UVA 247↵
↵
UVA 13057↵
↵
UVA 12645↵
↵
UVA 11770↵
↵
UVA 12926↵
↵
UVA 11324↵
↵
UVA 11709↵
↵
UVA 12745↵
↵
http://www.spoj.com/problems/TFRIENDS/ (4) //just scc size↵
↵
http://www.spoj.com/problems/CAPCITY/ (4) //scc destination [WEAK TC]↵
↵
http://mirror.codeforces.com/contest/22/problem/E (5) //[NICE][make it strongly connected][SRC>DST]↵
↵
</spoiler>↵
↵
<spoiler summary="segment_tree">↵
↵
http://www.spoj.com/problems/ADABERRY/ [+TREAP]↵
↵
http://www.spoj.com/problems/ADAGF/↵
↵
http://www.spoj.com/problems/ADATREE/↵
↵
http://mirror.codeforces.com/contest/911/problem/G (7) //Segment tree over queries↵
↵
http://mirror.codeforces.com/contest/895/problem/E (5) //[PRECISION]↵
↵
http://mirror.codeforces.com/contest/52/problem/C (4) //Easy [MIN]+[INCREASE]↵
↵
http://mirror.codeforces.com/contest/56/problem/E (5) //[NICE][NORMALIZE][MAX]↵
↵
http://mirror.codeforces.com/contest/877/problem/E (5) //[VERY NICE][EULER TOUR TREE]↵
↵
https://devskill.com/CodingProblems/ViewProblem/283↵
↵
https://devskill.com/CodingProblems/ViewProblem/315↵
↵
http://mirror.codeforces.com/problemset/problem/756/C↵
↵
http://mirror.codeforces.com/contest/739/problem/C (8)↵
↵
http://mirror.codeforces.com/contest/718/problem/C (8)↵
↵
http://mirror.codeforces.com/contest/750/problem/E (7)↵
↵
http://mirror.codeforces.com/contest/759/problem/C (7)↵
↵
11165 UVA (5)↵
↵
http://mirror.codeforces.com/contest/763/problem/E (8) //VERY NICE &mdash; [non-trivial]↵
↵
http://www.spoj.com/problems/BGSHOOT/ (5) //normalize &mdash; then easy↵
↵
http://www.spoj.com/problems/KGSS/ (4)↵
↵
http://mirror.codeforces.com/contest/765/problem/F (7) //VERY NICE &mdash; CASCADE↵
↵
http://www.spoj.com/problems/GSS1/ (5) //Idea &mdash; then easy↵
↵
http://www.spoj.com/problems/KQUERYO/ (5) //Seg-tree of vectors↵
↵
http://mirror.codeforces.com/contest/633/problem/G (8) //EulerTree+Seg+Bitset↵
↵
http://www.spoj.com/problems/NAJ0001/ (7) //10^8 int &mdash; memory (and worked)↵
↵
http://www.spoj.com/problems/PRMQUER/ (5) //2 segment trees + sieve↵
↵
http://www.spoj.com/problems/EC_DIVS/ (5) //dunno if intended↵
↵
http://www.spoj.com/problems/DCEPC11I/ (5) //NICE &mdash; 1,2,3,4,5,.. inc↵
↵
http://www.spoj.com/problems/QUE2/ (4) //kth number↵
↵
http://mirror.codeforces.com/contest/785/problem/E (6) //Seg+Treap [and faster]↵
↵
http://mirror.codeforces.com/contest/786/problem/B (6) //+Dijkstra↵
↵
13183 UVA (6) //Merge-Sort-Tree [dunno]↵
↵
http://mirror.codeforces.com/contest/121/problem/E (7) //Dunno &mdash; done by vectorisation↵
↵
http://mirror.codeforces.com/contest/803/problem/G (5) //VERY NICE!! &mdash; ST 10^9 + ST/RMQ 10^5↵
↵
http://mirror.codeforces.com/contest/794/problem/F (7) //Digit by digit! (N*log(N)*100 ~passes,2017-10-19)↵
↵
http://mirror.codeforces.com/contest/811/problem/E (6) //VERY NICE &mdash; DSU (easier Timofey + animals)↵
↵
http://mirror.codeforces.com/contest/817/problem/F (7) //10^18 + MEX ~~ NICE yet problematic↵
↵
http://mirror.codeforces.com/contest/816/problem/B (3) //Or offline trick makes it easier↵
↵
http://mirror.codeforces.com/contest/834/problem/D (5) //+Dynamic Programming | NICE ↵
↵
http://www.spoj.com/problems/SBO/ (5) //preLast→ last (-1), last→ now (+1) &mdash; VERY NICE↵
↵
http://www.spoj.com/problems/GOODE/ (5) //NICE: Inversion + L-Mex↵
↵
http://www.spoj.com/problems/CNTPRIME/ (3) //ST+Sieve (short range)↵
↵
http://www.spoj.com/problems/SEGSQRSS/ (4) //NICE {weak data} ~~ SQRT works too↵
↵
http://www.spoj.com/problems/MON2012/ (5) //NICE [Online][10^9 Range]↵
↵
http://www.spoj.com/problems/PARSUMS/ (4) //But other approaches work too↵
↵
http://www.spoj.com/problems/THRBL/ (4) //Simple SA &mdash; maximum on range <= A[a]↵
↵
http://www.spoj.com/problems/HORRIBLE/ (3) //Totally classical↵
↵
http://www.spoj.com/problems/MULTQ3/ (4)  //NICE (interesting operation)↵
↵
http://www.spoj.com/problems/PERMPATT/ (4) //NICE [minimum][+IDEA]↵
↵
http://mirror.codeforces.com/contest/869/problem/E (5) //NICE &mdash; 2D [random][XOR]↵
↵
http://mirror.codeforces.com/contest/19/problem/D (5) //NICE [+BS][+SET] {bs not necessary}↵
↵
</spoiler>↵
↵
<spoiler summary="sequences">↵
↵
11885 UVA 7 //Previous problem requested for statement↵
↵
11522 UVA 3 //Trick &mdash; low numbers only :P↵
↵
</spoiler>↵
↵
<spoiler summary="sieve">↵
↵
http://www.spoj.com/problems/ADAPRIME/↵
↵
http://mirror.codeforces.com/contest/114/problem/E (5) //[NICE][FAST THINGS NEEDED][SEGMENTED]↵
↵
http://mirror.codeforces.com/contest/58/problem/B (3) //[NICE][GREEDY][LEAST PRIME FACTOR]↵
↵
Project Euler #134: Prime pair connection //Segmented↵
↵
11610 UVA (5)↵
↵
11353 UVA (3)↵
↵
http://www.spoj.com/problems/TDPRIMES/ (4)↵
↵
http://www.spoj.com/problems/VECTAR8/ (3)↵
↵
http://www.spoj.com/problems/NFACTOR/ (4)↵
↵
http://www.spoj.com/problems/HS08PAUL/ (4) //simply generate↵
↵
http://mirror.codeforces.com/contest/776/problem/B (3) //Easy &mdash; trict: PM-1/ELSE-2↵
↵
http://www.spoj.com/problems/GGD/ (4) // N/lowestDiv*(lowestDiv-1)↵
↵
http://mirror.codeforces.com/contest/822/problem/D (4) //DP + Lowest factor↵
↵
http://www.spoj.com/problems/NGIRL/ (4) //Squares &mdash; Primes + BS == Easiest↵
↵
http://www.spoj.com/problems/PTRI/ (5) //Very fast sieve necessary:/↵
↵
http://www.spoj.com/problems/AFS/ (3) //Sum of divisort + DP↵
↵
http://www.spoj.com/problems/BSPRIME/ (4) //Very fast sieve needed↵
↵
http://www.spoj.com/problems/DCEPC505/ (4) //NICE &mdash; at most 10527450↵
↵
http://www.spoj.com/problems/CUBEFR/ (3) //NICE &mdash; Sieve out k^3 numbers↵
↵
http://www.spoj.com/problems/PRIMES2/ (8) //VERY NICE &mdash; Some hell-shit optimizing↵
↵
http://mirror.codeforces.com/contest/26/problem/A (2) //Easy &mdash; many ways to solve it↵
↵
</spoiler>↵
↵
<spoiler summary="simulation">↵
↵
https://abc084.contest.atcoder.jp/tasks/abc084_c (3) //Brute-Force↵
↵
http://mirror.codeforces.com/contest/908/problem/B (2) //[EASY][NICE]↵
↵
http://mirror.codeforces.com/contest/141/problem/B (3) //[NICE][IF-PARTY]↵
↵
7921 &mdash; Anticlockwise Motion (4) //Simulate in sqrt↵
↵
7691 &mdash; Falling Apples (3)↵
↵
7977 &mdash; The Key to Cryptography (2)↵
↵
http://mirror.codeforces.com/contest/129/problem/B (2) //Graph↵
↵
http://mirror.codeforces.com/contest/903/problem/B (2) //[NICE]↵
↵
http://mirror.codeforces.com/contest/120/problem/C (1)↵
↵
http://mirror.codeforces.com/contest/118/problem/A (1)↵
↵
8012 &mdash; Voting Fraud (1)↵
↵
http://mirror.codeforces.com/contest/897/problem/A (1) //BF &mdash; do as they say↵
↵
7985 &mdash; Bumper-to-Bumper Traffic (4) //FINE &mdash; We have whole time-lapse↵
↵
7988 Flow Shop (3) //Do as they say. Trivial but not bad.↵
↵
7703 &mdash; Reading Digits (2) //Simple simulate what they ask for↵
↵
http://mirror.codeforces.com/contest/893/problem/A (1) //Easy but nice↵
↵
http://mirror.codeforces.com/contest/102/problem/B (2) //Do as they write &mdash; log-convergence↵
↵
http://mirror.codeforces.com/contest/92/problem/A (1) //Way too easy↵
↵
http://mirror.codeforces.com/contest/88/problem/C (3) //[NUMBER THEORY]↵
↵
http://mirror.codeforces.com/contest/84/problem/D (4) //Priority queue by min*size↵
↵
http://mirror.codeforces.com/contest/79/problem/A (1) //Simulate rules↵
↵
http://mirror.codeforces.com/contest/879/problem/A (1) //Iterate day-by-day↵
↵
http://mirror.codeforces.com/contest/879/problem/B (3) //Either at most N^2 or the biggest element [NICE]↵
↵
http://mirror.codeforces.com/contest/879/problem/D (4) //[NICE][Array elimination]↵
↵
http://mirror.codeforces.com/contest/46/problem/A (2) //[EASY][MODULO]↵
↵
http://mirror.codeforces.com/contest/46/problem/B (3) //[EASY][SEARCH-EACH-QUERY]↵
↵
http://mirror.codeforces.com/contest/55/problem/A (2) //Simple (long) simulation↵
↵
http://mirror.codeforces.com/contest/60/problem/A (1) //Moving LR bounds↵
↵
12187 UVA (2)↵
↵
http://mirror.codeforces.com/contest/724/problem/C 5↵
↵
http://mirror.codeforces.com/contest/746/problem/C 3↵
↵
11093 UVA (2)↵
↵
http://mirror.codeforces.com/contest/768/problem/C (4)↵
↵
http://www.spoj.com/problems/WRONG/ (5) //VERY NICE &mdash; precalculate from back, then go from front↵
↵
http://mirror.codeforces.com/contest/864/problem/C (4) //Not nice &mdash; just iffs↵
↵
http://www.spoj.com/problems/WAGE/ (3) //Simple Game Of Life Modification↵
↵
http://mirror.codeforces.com/contest/6/problem/C (2) //Simple simulate from both sides↵
↵
http://mirror.codeforces.com/contest/9/problem/B (2) //Simulate what is given (+ doubles)↵
↵
http://mirror.codeforces.com/contest/11/problem/B (3) //sqrt(X) [diff must be even]↵
↵
http://mirror.codeforces.com/contest/30/problem/A (2) //Simply simulate process [-1000→ 1000]↵
↵
</spoiler>↵
↵
<spoiler summary="sorting">↵
↵
http://www.spoj.com/problems/ADATOMAT/↵
↵
http://www.spoj.com/problems/ADAUSORT/↵
↵
http://www.spoj.com/problems/ADACUT/↵
↵
http://www.spoj.com/problems/ADAHLIA/ ↵
↵
http://www.spoj.com/problems/SEUG/ (2) //Bad statement↵
↵
http://mirror.codeforces.com/contest/141/problem/A (2) //Or frequency↵
↵
http://mirror.codeforces.com/contest/137/problem/E (4) //[NICE][PREFIX SUM MATCHING]↵
↵
http://mirror.codeforces.com/contest/137/problem/C (4) //[NICE][FENWICK WORKS TOO]↵
↵
http://mirror.codeforces.com/contest/136/problem/C (3) //Last to 1(2) |OR| first to INF↵
↵
7601 &mdash; Football (3) //Greedy↵
↵
7673 &mdash; What a Simple Research (2) //[EASY][IMPLE]↵
↵
http://mirror.codeforces.com/contest/108/problem/B (2) //Easy & Adjacent↵
↵
8025 &mdash; Stacking Cups (2)  //Sorting+input↵
↵
http://mirror.codeforces.com/contest/892/problem/A (2) //[EASY][SUM]↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/2290 (3) //Sort+check [fast]↵
↵
http://mirror.codeforces.com/contest/81/problem/C (3) //MATH[Lesser=greater][comparator]↵
↵
http://mirror.codeforces.com/contest/53/problem/D (3) //Bubble sort↵
↵
http://mirror.codeforces.com/contest/58/problem/D (4) //[BUCKET][GREEDY][STRING]↵
↵
UVA 10810 //INV↵
↵
UVA 11858 //INV↵
↵
http://mirror.codeforces.com/problemset/problem/645/B //INV↵
↵
UVA 10327 //INV↵
↵
http://www.spoj.com/problems/BUBBLESORT/ //INV↵
↵
UVA 11495 //INV [GAME]↵
↵
http://www.spoj.com/problems/CODESPTB/ //INV↵
↵
UVA 13212 //INV↵
↵
http://mirror.codeforces.com/problemset/problem/749/E //INV↵
↵
12189 UVA (3)↵
↵
12196 UVA (4)↵
↵
http://mirror.codeforces.com/contest/731/problem/D 7↵
↵
11925 UVA (4)↵
↵
11979 UVA (3)↵
↵
http://mirror.codeforces.com/contest/747/problem/D (4)↵
↵
11890 UVA (4)↵
↵
http://www.spoj.com/problems/KAOS/ (4) //INV &mdash; GOOD problem!!!!↵
↵
http://www.spoj.com/problems/KSMALL/ (5) //fast sort /or/ quick-select↵
↵
http://www.spoj.com/problems/RKS/ (3) //use map↵
↵
http://www.spoj.com/problems/SPCJ/ (4) //reverse + go from back↵
↵
http://mirror.codeforces.com/contest/785/problem/B (2) //last-first + vice versa↵
↵
http://mirror.codeforces.com/contest/798/problem/D (4) //Take 1st then take best B of every pair (sort by A)↵
↵
http://mirror.codeforces.com/contest/810/problem/B (2)↵
↵
http://mirror.codeforces.com/contest/810/problem/C (3) //+Math↵
↵
http://mirror.codeforces.com/contest/814/problem/A (1) //Pro prváky &mdash; but nice observation↵
↵
http://mirror.codeforces.com/contest/817/problem/B (3) //Frequency of TOP 3↵
↵
10769 UVA (3) //Sadly N^4 passes↵
↵
13208 UVA (4) //Sort + Prefix Sum↵
↵
13212 UVA (3) //Number of inversions↵
↵
http://mirror.codeforces.com/contest/831/problem/C (3) //NICE ~ Check all "add" against first↵
↵
http://mirror.codeforces.com/contest/831/problem/D (4) //Can be solved with BS+Max-Match↵
↵
http://mirror.codeforces.com/contest/841/problem/C (3) //NICE &mdash; match greatest to lowest↵
↵
http://mirror.codeforces.com/contest/845/problem/C (2) //EASY &mdash; pro prvaky↵
↵
http://www.spoj.com/problems/HSHW/ (4) //Test every big/low pair + big/big low/low on +/-↵
↵
http://www.spoj.com/problems/CODESPTB/ (3) //Count inversions [BASIC]↵
↵
http://mirror.codeforces.com/contest/863/problem/B (2) //Sort and omit 2↵
↵
http://www.spoj.com/problems/AMR10G/ (2) //Easy yet NICE↵
↵
http://mirror.codeforces.com/contest/12/problem/C (2) //Very simple↵
↵
http://mirror.codeforces.com/contest/16/problem/B (1) //[EASY]↵
↵
http://mirror.codeforces.com/contest/22/problem/D (3) //Sort by begin + sweep↵
↵
http://mirror.codeforces.com/contest/23/problem/C (3) //Take them by pairs + add last↵
↵
http://mirror.codeforces.com/contest/24/problem/B (3) //Simple follow the rules↵
↵
http://mirror.codeforces.com/contest/27/problem/B (3) //Compare number of victories↵
↵
http://mirror.codeforces.com/contest/27/problem/C (4) //[NICE] Find next bigger/lesser (sort)↵
↵
</spoiler>↵
↵
<spoiler summary="spanning_tree">↵
↵
http://mirror.codeforces.com/contest/908/problem/F (5) //[VERY NICE] //Not exactly MST but similar[GREEDY]↵
↵
http://mirror.codeforces.com/contest/125/problem/E (5) //[BS]↵
↵
http://mirror.codeforces.com/contest/76/problem/A (4) //[VERY NICE] Sort by A and KEEP spanning + one edge↵
↵
LA 6622 &mdash; Absurdistan Roads (4) //Plus one edge↵
↵
UVA 12176↵
↵
UVA 10600↵
↵
UVA 10724↵
↵
https://www.hackerrank.com/contests/june-world-codesprint/challenges/johnland↵
↵
UVA 11710↵
↵
Gym 101252C [2014-2015 CT S02E05: Codeforces Trainings Season 2 Episode 5 &mdash; 2009-2010 ACM-ICPC]↵
↵
Gym 101047I [2015 USP Try-outs][HARD]↵
↵
UVA 11183 [Directed]↵
↵
LightOJ 1101↵
↵
https://www.codechef.com/problems/CHEFELEC↵
↵
UVA 10307↵
↵
http://mirror.codeforces.com/problemset/problem/598/D↵
↵
http://mirror.codeforces.com/problemset/problem/32/C↵
↵
http://mirror.codeforces.com/problemset/problem/744/A↵
↵
https://devskill.com/CodingProblems/ViewProblem/344↵
↵
908 &mdash; Re-connecting Computer Sites [UVA]↵
↵
1208 &mdash; Oreon [UVA]↵
↵
1235 &mdash; Anti Brute Force Lock [UVA]↵
↵
10034 &mdash; Freckles [UVA]↵
↵
11228 &mdash; Transportation system [UVA]↵
↵
11631 &mdash; Dark roads [UVA]↵
↵
11733 &mdash; Airports [UVA]↵
↵
11747 &mdash; Heavy Cycle Edges [UVA]↵
↵
BLINNET SPOJ (3)↵
↵
11183 UVA (4) //Directed [need to know algo!]↵
↵
http://www.spoj.com/problems/ULM09/ (3) //Sum-Kruskal↵
↵
http://www.spoj.com/problems/IITKWPCG/ (4) //VERY NICE [log instead of price]↵
↵
http://mirror.codeforces.com/contest/17/problem/B (3) //Spanning tree [no dsu]↵
↵
</spoiler>↵
↵
<spoiler summary="spfa">↵
↵
LightOJ 1074↵
↵
UVA 1171↵
↵
UVA 11478↵
↵
UVA 12768↵
↵
11478 UVA (5)↵
↵
</spoiler>↵
↵
<spoiler summary="sqrt">↵
↵
12003 UVA 7↵
↵
11990 UVA (5)↵
↵
http://www.spoj.com/problems/GIVEAWAY/ (7) //SQRT + BS >  [or Seg+Trie]↵
↵
http://mirror.codeforces.com/contest/786/problem/C (5) //Nsqrn (bg) + sqrSegs (end)↵
↵
http://mirror.codeforces.com/contest/840/problem/D (5) //NICE &mdash; Either frequent OR brute-force↵
↵
http://mirror.codeforces.com/contest/13/problem/E //VERY NICE [SQRT-BLOCK UPDATE/JUMP]↵
↵
http://mirror.codeforces.com/contest/85/problem/D (4) //NICE [ST shall work too]↵
↵
</spoiler>↵
↵
<spoiler summary="stl">↵
↵
http://www.spoj.com/problems/ADABASET/ [IO-testing][ARRAY]↵
↵
http://www.spoj.com/problems/ADALIST/ [ROPE]↵
↵
http://www.spoj.com/problems/ADAFIELD/ [SET]↵
↵
http://www.spoj.com/problems/ADAQUEUE/↵
↵
http://www.spoj.com/problems/ADAFRIEN/↵
↵
http://mirror.codeforces.com/contest/911/problem/E (4) //[NICE][STACK][SET]↵
↵
http://mirror.codeforces.com/contest/909/problem/D (4) //[VERY NICE][SIMULATION][GROUP]↵
↵
http://mirror.codeforces.com/contest/899/problem/E (4) //[VERY NICE][SET]↵
↵
https://arc087.contest.atcoder.jp/tasks/arc087_a (2) //Map↵
↵
http://mirror.codeforces.com/contest/903/problem/C (2) //Map↵
↵
http://mirror.codeforces.com/contest/900/problem/C (3) //[NICE][SET]↵
↵
http://mirror.codeforces.com/contest/112/problem/A (1) //tolower [trivial]↵
↵
3396 &mdash; Alphabetics (2) //Getline, letters identification↵
↵
http://mirror.codeforces.com/contest/81/problem/A (2) //Stack OR string↵
↵
http://mirror.codeforces.com/contest/78/problem/A (1) //fgets + imple↵
↵
http://mirror.codeforces.com/contest/69/problem/E (3) //NICE [2POINTERS][SET][MAP]↵
↵
http://www.spoj.com/problems/RMID/ //Dynamic Median↵
↵
http://www.spoj.com/problems/RMID2/ //Dynamic Median↵
↵
http://mirror.codeforces.com/problemset/problem/713/C //Dynamic Median↵
↵
http://www.spoj.com/problems/EC_ESTA/ //Dynamic median↵
↵
http://mirror.codeforces.com/contest/799/problem/B (2) //EASY &mdash; MAP↵
↵
http://mirror.codeforces.com/contest/808/problem/D (3) //MAP↵
↵
10887 (2) //string + map↵
↵
10730 (3) //Easy with hash-map↵
↵
http://mirror.codeforces.com/contest/821/problem/C (3) //STACK (vector) Nice+Easy↵
↵
http://www.spoj.com/problems/SOLVEIT/ (3) //Set + lower_bound↵
↵
http://www.spoj.com/problems/IITKWPCA/ (2) //Set + getline↵
↵
http://mirror.codeforces.com/contest/849/problem/D (5) //Queue↵
↵
http://www.spoj.com/problems/CRAN02/ (4) //Map (+Math)↵
↵
http://www.spoj.com/problems/MAX_NUM/ (4) //Queue (possibly multiple ways)↵
↵
http://www.spoj.com/problems/SID/ (5) //Sort + Vector (or similar) [strict TLE]↵
↵
http://www.spoj.com/problems/RPLD/ (2) //Map of sets↵
↵
http://mirror.codeforces.com/contest/861/problem/D (4) //unordered map of sets↵
↵
http://www.spoj.com/problems/FACEFRND/ (2) //Set or Bitset↵
↵
http://www.spoj.com/problems/HACKRNDM/ (3) //Easy &mdash; map↵
↵
http://mirror.codeforces.com/contest/847/problem/K (4) //NICE Map+Queue↵
↵
http://mirror.codeforces.com/contest/855/problem/A (1) //set↵
↵
http://mirror.codeforces.com/contest/4/problem/C (2) //map+string↵
↵
http://mirror.codeforces.com/contest/5/problem/E (6) //iffs + RMQ+BS+SET [or other sol]↵
↵
http://mirror.codeforces.com/contest/44/problem/A (1) //Set + pair↵
↵
http://mirror.codeforces.com/contest/45/problem/C (4) //NICE &mdash; Handling with sets↵
↵
</spoiler>↵
↵
<spoiler summary="strings">↵
↵
http://mirror.codeforces.com/contest/909/problem/A (1) //Lexicographical comparision [EASY]↵
↵
7948 Periodic Strings (2) //Brute-force↵
↵
7892 &mdash; Game of Matchings (6) //No idea &mdash; heuristic works &mdash; but seems to be nice↵
↵
8017 &mdash; Mancunian and Sonu Generate Strings (5) //[NICE][DP]//+Something: Trie/SA/SET...?↵
↵
http://mirror.codeforces.com/contest/890/problem/D (4) //[NICE][SET][SORTING][26][BRUTE-FORCE]↵
↵
http://mirror.codeforces.com/contest/43/problem/B (2) //Frequency↵
↵
http://mirror.codeforces.com/contest/50/problem/B (2) //Frequency + Power↵
↵
http://www.spoj.com/problems/MINMOVE/ (3) //Minimal lexicographical rotation↵
↵
http://www.spoj.com/problems/BWHEELER/ //Burrows Wheeler↵
↵
http://www.spoj.com/problems/EDIST/ //Edit Distance↵
↵
3189 LA //Edit Distance↵
↵
https://www.hackerrank.com/contests/morgan-stanley-2015/challenges/minimum-transformation-cost/problem //Edit Distance↵
↵
http://mirror.codeforces.com/gym/101492/problem/L //Laevenstein Distance↵
↵
UVA 13068 //Lexicographically lowest rotation↵
↵
2755 [LA]//Lexicographically lowest rotation↵
↵
LightOJ 1073 //Lexicographically Shortest Superstring↵
↵
http://mirror.codeforces.com/contest/762/problem/C 5↵
↵
http://www.spoj.com/problems/LCS0/ 10 //LCS↵
↵
http://www.spoj.com/problems/IITWPC4H/ 2 //Frequence array↵
↵
13186 UVA (6)  //Bitset + Trie ~ NICE [6-7 mby?]↵
↵
http://mirror.codeforces.com/contest/798/problem/B (2) //Brute-force .. pro prváky↵
↵
10745 UVA (4) //Frequency (N^2 possible if efficient!!)↵
↵
http://mirror.codeforces.com/contest/822/problem/B (2) //Easy pro prvaky (slightly imple.)↵
↵
http://mirror.codeforces.com/contest/828/problem/C (4) //+Sorting (process only necessary!)↵
↵
http://mirror.codeforces.com/contest/832/problem/B (3) //Naive compare back+front [+freq]↵
↵
http://www.spoj.com/problems/STC04/ (5) //Next + pairs O(N*26) [frist look O(26^2*N)]↵
↵
http://www.spoj.com/problems/IITKWPCJ/ (4) //GCD or HASHING↵
↵
http://www.spoj.com/problems/SUBSN/ (4) //Next (NICE &mdash; bad input): ↵
↵
http://www.spoj.com/problems/BOGGLE/ (2) //EASY [MAP][STREAM]↵
↵
http://www.spoj.com/problems/MAIN8_E/ (4) //VERY NICE &mdash; Next function↵
↵
http://www.spoj.com/problems/STRMATCH/ (3) //Nice matching, yet low constraints on "N"↵
↵
http://www.spoj.com/problems/FINDSR/ (3) //Clever bruteforce works here (NlogN)↵
↵
http://mirror.codeforces.com/contest/39/problem/J (2) //Simple iteration over string↵
↵
http://mirror.codeforces.com/contest/876/problem/E (4) //Compare from back + make fail-pairs↵
↵
</spoiler>↵
↵
<spoiler summary="suffix_array">↵
↵
http://www.spoj.com/problems/ADAPHOTO/ [or hashing after turboanalisis]↵
↵
http://www.spoj.com/problems/ADASTRNG/↵
↵
http://mirror.codeforces.com/contest/129/problem/D (4) //[NICE]//Suffix Automaton / Brute Force works too↵
↵
http://mirror.codeforces.com/contest/123/problem/D (5) //[NICE][RMQ][D&C]↵
↵
8086  Substring Sorting (7) //[VERY NICE][RMQ][BS][PST]↵
↵
7702 &mdash; Castle //6 [VERY NICE][RMQ][BS][FW]↵
↵
7701 &mdash; Favorite music //8 [VERY NICE][RMQ][SEARCH][OPTI] //WRONG TIME-LIMIT==OPTI↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/1530 //7 [VERY NICE][RMQ][SET][OFFLINE]↵
↵
https://www.urionlinejudge.com.br/judge/en/problems/view/2000 (5) //Basic disubstr counting↵
↵
UVA 760 //LCS↵
↵
UVA 1227 //LCS↵
↵
http://www.spoj.com/problems/LCS/en/  //LCS↵
↵
UVA 11512↵
↵
7502 [LA]↵
↵
Gym 100923D [2015 ACM National Contest Romania &mdash; Round 1]↵
↵
UVA 1254↵
↵
UVA 12191↵
↵
UVA 12206↵
↵
https://www.codechef.com/problems/INSQ16F↵
↵
3943 LA↵
↵
UVA 11107↵
↵
UVA 12974↵
↵
UVA 10526↵
↵
Davos and Reading [INSOMNIA] //Awesome problem but can't find link [hard] &mdash; non of regular judges↵
↵
UVA 12338↵
↵
https://devskill.com/CodingProblems/ViewProblem/328↵
↵
12191 UVA 5↵
↵
SARRAY SPOJ 3↵
↵
4513 LA 6↵
↵
http://www.spoj.com/problems/LCS2/ 7 // must be linear (SA+LCP+MQ)↵
↵
http://mirror.codeforces.com/contest/802/problem/I 7 //NICE! SA+LCP+(Segmentree/queue)↵
↵
http://www.spoj.com/problems/LONGCS/ //5 LCS  of multiple strings (NICE)↵
↵
http://www.spoj.com/problems/SUBLEX/ //5 VERY NICE: Kth substring↵
↵
http://mirror.codeforces.com/contest/873/problem/F //6 VERY NICE: SA+Histogram↵
↵
http://mirror.codeforces.com/contest/30/problem/E //7 VERY NICE: [many other sols: Manach/KMP/HASH...]↵
↵
6856 &mdash; Circle of digits //7 [VERY NICE]↵
↵
</spoiler>↵
↵
↵
<spoiler summary="ternary_search">↵
↵
LightOJ 1146↵
↵
Gym 101482G [2014-2015 Northwestern European Regional Contest (NWERC 2014)]↵
↵
Gym 101309D [2010-2011 ACM-ICPC Northeastern European Regional Contest (NEERC 10)]↵
↵
UVA 13010 //+Dijkstra↵
↵
2015-2016 CTU Open Contest: Chasing the Cheetah↵
↵
12197 UVA (4)↵
↵
http://www.spoj.com/problems/KOPC12A/ (4) //TS (sadly brute-force works too N^2)↵
↵
</spoiler>↵
↵
<spoiler summary="topo">↵
↵
UVA 11686↵
↵
LightOJ 1034↵
↵
UVA 10305↵
↵
124 &mdash; Following Orders [UVA]↵
↵
200 &mdash; Rare Order [UVA]↵
↵
872 &mdash; Ordering [UVA]↵
↵
11060 &mdash; Beverages [UVA]↵
↵
http://mirror.codeforces.com/contest/765/problem/E 5↵
↵
http://mirror.codeforces.com/contest/770/problem/C 4 //reduce + toposort↵
↵
http://mirror.codeforces.com/contest/825/problem/E 4 //Toposort from biggest/backward↵
↵
http://www.spoj.com/problems/CODESPTI/ (6) //VERY NICE &mdash; Hard/Weak children↵
↵
http://mirror.codeforces.com/contest/47/problem/B (2) //[EASY][Toposort on 3 elements]↵
↵
</spoiler>↵
↵
<spoiler summary="treap">http://mirror.codeforces.com/contest/909/problem/E (4) //[NICE][BFS][RECURSION]↵
↵
</spoiler>↵
↵
<spoiler summary="treap">↵
↵
http://mirror.codeforces.com/contest/899/problem/F (5) //[VERY NICE][DATA STRUCTURE] (FW or Treap)↵
↵
http://mirror.codeforces.com/contest/879/problem/E (6) //[VERY NICE][Making somponents]↵
↵
http://www.spoj.com/problems/ADAAPHID/ [or clever fenwick][or SQRT-tree]↵
↵
http://www.spoj.com/problems/ADACROP/↵
↵
http://mirror.codeforces.com/contest/762/problem/E 6↵
↵
http://www.spoj.com/problems/COUNT1IT/ 5↵
↵
http://www.spoj.com/problems/IITWPC4D/ 4 //From end &mdash; pick i-th + del i-th↵
↵
http://www.spoj.com/problems/ALLIN1/ 4 //Typical treap operations↵
↵
http://mirror.codeforces.com/contest/847/problem/D 5 //Prolly overkill &mdash; VERY NICE↵
↵
http://mirror.codeforces.com/contest/863/problem/D 4 //Not desired solution↵
↵
http://www.spoj.com/problems/KOILINE/ (4) //VERY NICE &mdash; Iterate from back &mdash; get+remove↵
↵
http://www.spoj.com/problems/TWIST/ (5) //NICE: Reverse ↵
↵
http://www.spoj.com/problems/MEANARR/ (5) //VERY NICE! [POLICY][SHORT]↵
↵
</spoiler>↵
↵
<spoiler summary="tree">↵
↵
http://www.spoj.com/problems/ADATOMEL/ ↵
↵
http://mirror.codeforces.com/contest/894/problem/D (5) //[NICE][MERGING][BINARY]↵
↵
http://mirror.codeforces.com/contest/746/problem/G 5↵
↵
http://mirror.codeforces.com/contest/750/problem/F 9↵
↵
http://www.spoj.com/problems/RTREE/ 3 //longest path tree &mdash; query↵
↵
13175 UVA (2) //something like preorder build↵
↵
http://mirror.codeforces.com/contest/796/problem/C (3) //Just counting &mdash; inc by at most 2↵
↵
http://mirror.codeforces.com/contest/797/problem/D (4) //VERY NICE &mdash; sort + D&C all↵
↵
http://mirror.codeforces.com/contest/805/problem/E (4) //NICE &mdash; Treewidth coloring (greedy)↵
↵
http://mirror.codeforces.com/contest/828/problem/D (3) //Star construction↵
↵
http://www.spoj.com/problems/TREEDEGREE/ (3) //Degree from euler tree↵
↵
http://www.spoj.com/problems/UCV2013J/ (3) //Find what is leaf in Binary Tree↵
↵
http://www.spoj.com/problems/GCPC11J/ (3) //Finding ceter↵
↵
http://mirror.codeforces.com/contest/34/problem/D (3) //Simple reconstruction + DFS↵
↵
</spoiler>↵
↵
<spoiler summary="tree-dp">↵
↵
http://www.spoj.com/problems/ADASALES/↵
↵
http://www.spoj.com/problems/PT07X/ (4) //Classical- VC on tree [NICE]↵
↵
http://mirror.codeforces.com/contest/81/problem/E (6) //[NICE][PSEUDOFOREST REDUCTION]↵
↵
http://mirror.codeforces.com/contest/61/problem/D (4) //dfs-only might works too ↵
↵
LA 6631 &mdash; Jingle Balls (4) //[NICE][SIMPLE]↵
↵
https://www.codechef.com/problems/TRANDED //By [user:sahil070197,2017-128-01-01]↵
↵
13089 &mdash; Golden Coins (UVA)↵
↵
http://mirror.codeforces.com/problemset/problem/855/C↵
↵
http://mirror.codeforces.com/problemset/problem/718/D↵
↵
https://www.codechef.com/problems/TWOCOINS↵
↵
https://www.hackerrank.com/contests/101hack35/challenges/road-maintenance/problem↵
↵
7649 &mdash; Performance Review (LA)↵
↵
http://mirror.codeforces.com/problemset/problem/741/D↵
↵
http://mirror.codeforces.com/problemset/problem/592/D↵
↵
https://www.codechef.com/problems/TOMJERGA↵
↵
http://mirror.codeforces.com/problemset/problem/814/D↵
↵
1220 &mdash; Party at Hali-Bula (UVA)↵
↵
https://www.hackerrank.com/contests/june-world-codesprint/challenges/r-tree-decoration/problem↵
↵
12452 &mdash; Plants vs. Zombies HD SP (UVA)↵
↵
http://mirror.codeforces.com/problemset/problem/735/E↵
↵
https://www.codechef.com/problems/COLTREE↵
↵
12466 &mdash; Ancestors (UVA)↵
↵
6829 &mdash; Intrepid climber (LA)↵
↵
https://www.hackerrank.com/contests/101hack35/challenges/jeanies-route↵
↵
12257 &mdash; The Queue (UVA)↵
↵
http://mirror.codeforces.com/problemset/problem/805/F↵
↵
http://mirror.codeforces.com/problemset/problem/763/D↵
↵
1218 &mdash; Perfect Service↵
↵
3346 &mdash; Perfect Domination on Trees (same as above -_-)↵
↵
12093 &mdash; Protecting Zonk↵
↵
10859 &mdash; Placing Lampposts↵
↵
http://mirror.codeforces.com/problemset/problem/23/E //NICE [but requires big int]↵
↵
http://mirror.codeforces.com/problemset/problem/14/D (5) //NICE [sorting-one][2DFS]↵
↵
http://www.spoj.com/problems/TWOPATHS/ (6) //VERY NICE Same as above ~ bigger constraints↵
↵
http://mirror.codeforces.com/contest/868/problem/E (8) //VERY NICE &mdash; HARD &mdash; on tree↵
↵
</spoiler>↵
↵
<spoiler summary="trie_bit">↵
↵
http://mirror.codeforces.com/contest/888/problem/G (5) //NICE[BIT-BY-BIT D&C]↵
↵
http://mirror.codeforces.com/contest/842/problem/D //Proposed by [user:usernameson,2017-128-01-01]↵
↵
http://mirror.codeforces.com/problemset/problem/706/D↵
↵
https://www.hackerrank.com/contests/w8/challenges/black-box-1↵
↵
https://csacademy.com/contest/round-42/task/xor-submatrix/↵
↵
http://mirror.codeforces.com/contest/714/problem/C 5↵
↵
http://www.spoj.com/problems/SUBXOR/ (4)↵
↵
http://mirror.codeforces.com/contest/817/problem/E (5) //Classical &mdash; remember sum! NICE!↵
↵
http://mirror.codeforces.com/contest/37/problem/C (4) //NICE &mdash; Prefix dictionary [or math]↵
↵
</spoiler>↵
↵
<spoiler summary="trie_string">↵
↵
http://www.spoj.com/problems/ADAINDEX/↵
↵
8015 &mdash; Alice and Bob play Contact (5) //[VERY NICE] 1stBob↵
↵
2642 [LA]↵
↵
UVA 10860↵
↵
UVA 10295↵
↵
UVA 13186 //+Bitset↵
↵
UVA 1123↵
↵
UVA 12506↵
↵
UVA 11539↵
↵
UVA 1142↵
↵
UVA 12359↵
↵
UVA 10282↵
↵
11732 UVA (5)↵
↵
11539 UVA (5)↵
↵
11488 UVA (4)↵
↵
http://www.spoj.com/problems/TRYCOMP/ (4)↵
↵
10860 UVA (4) //DP + Trie [nice &mdash; slightly generic]↵
↵
http://www.spoj.com/problems/DICT/ (4) //Sample trie &mdash; but slightly weak/wrong data-set↵
↵
</spoiler>↵
↵
<spoiler summary="TSP">↵
↵
Gym 100818E [2015-2016 ACM-ICPC Southeastern European Regional Programming Contest (SEERC 2015)]↵
↵
3725 [LA]↵
↵
UVA 10496↵
↵
Gym 101020H [2015 Syrian Private Universities Collegiate Programming Contest] N!↵
↵
LightOJ 1057↵
↵
UVA 11643 //[NICE][BFS]↵
↵
3305 [LA] //On plane↵
↵
10937 UVA (4) //find '!' / BFS / TSP &mdash; NICE!↵
↵
10944 UVA (4) ↵
↵
10818 UVA (5) //Easy &mdash; but not-easy implementation: ++Dijkstra [LEX!]↵
↵
http://www.spoj.com/problems/A_W_S_N/ (4) //BFS + TSP (path) &mdash; NICE↵
↵
</spoiler>↵
↵
<spoiler summary="two-pointers">↵
↵
http://www.spoj.com/problems/ADAFENCE/ [Multiple Pointers]↵
↵
http://www.spoj.com/problems/ADAPLANT/↵
↵
http://mirror.codeforces.com/contest/144/problem/C (3) //[NICE][FREQUENCY][STRINGS]↵
↵
http://mirror.codeforces.com/contest/895/problem/B (3) //[OR BS]↵
↵
http://mirror.codeforces.com/contest/84/problem/B (2) //EASY //ll↵
↵
http://mirror.codeforces.com/contest/79/problem/C (4) //NICE &mdash; [STRINGS][SET][COMPARE]↵
↵
http://mirror.codeforces.com/contest/746/problem/F 6↵
↵
11436 UVA (5)↵
↵
http://mirror.codeforces.com/contest/760/problem/D 4↵
↵
11386 UVA (4)↵
↵
http://www.spoj.com/problems/WOWSUBSTR2/ 3↵
↵
http://www.spoj.com/problems/ARRAYSUB/ 4↵
↵
http://www.spoj.com/problems/CODFURY/ 3 //easy &mdash; ukazkove↵
↵
http://mirror.codeforces.com/contest/769/problem/B 3 //sort + TP↵
↵
http://mirror.codeforces.com/contest/814/problem/C 4 //NICE &mdash; maybe some DP +/-↵
↵
http://www.spoj.com/problems/CRAN04/ 4 //NICE &mdash; (more or less) 3 pointers↵
↵
http://www.spoj.com/problems/OPCPIZZA/ 3 //NICE [EASY] [AGAINS EACH OTHER]↵
↵
http://www.spoj.com/problems/ALIEN/ (3) //Classical↵
↵
http://www.spoj.com/problems/HOTELS/ (3) //Classical & Easy↵
↵
http://www.spoj.com/problems/KOIREP/ (4) //VERY NICE &mdash; N buckedt find mid diff↵
↵
http://mirror.codeforces.com/contest/6/problem/E (4) //NICE &mdash; Multiset↵
↵
http://mirror.codeforces.com/contest/873/problem/C (3) //NICE &mdash; M times 2P tenchique↵
↵
</spoiler>↵
↵
<spoiler summary="wavelet_tree">↵
↵
UVA 1480↵
↵
http://www.spoj.com/problems/ILKQUERY/↵
↵
http://mirror.codeforces.com/contest/840/problem/D //Proposed by [user:GreenGrape,2017-128-01-01]↵
↵
</spoiler>↵
↵
<spoiler summary="Zfunction">↵
↵
https://www.codechef.com/problems/CHSTR //Proposed by [user:Apptica,2017-128-01-01]↵
↵
http://www.spoj.com/problems/SUFEQPRE/↵
↵
http://mirror.codeforces.com/problemset/problem/126/B↵
↵
http://mirror.codeforces.com/contest/119/problem/D (7) //[VERY NICE]↵
↵
</spoiler>↵
↵
<spoiler summary="2SAT">↵
↵
11930 UVA (4)↵
↵
http://mirror.codeforces.com/contest/776/problem/D (5) ↵
↵
</spoiler>↵
↵
Finally if you would like to add some problem to the list &mdash; even though I would be glad, please do so only in case of:↵
↵
1. It is very interesting↵
↵
2. There is nothing, or low number of problems in the topic↵
↵
3. You add it in "bigger amount" at once↵
↵
Thank you.↵
↵
Offcourse if you have any remarks, questionns or requests, don't hesitate to ask.↵
↵
PS: I'm sorry but there might be some duplicities. In that case, either report it or ignore it (unless they are in different topics, then it have reason :) )↵
↵
Good Luck & Have Nice Day↵
↵
↵

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en9 English -Morass- 2019-08-16 18:25:45 25205 Next update (but prolly fails :/)
en8 English -Morass- 2018-09-03 15:50:40 101 bridge update
en7 English -Morass- 2018-09-03 15:48:08 6797 Josephus n Fenwick update
en6 English -Morass- 2018-06-29 11:21:42 0 (published)
en5 English -Morass- 2018-01-23 17:23:19 2680 Added proposed SCC problem
en4 English -Morass- 2018-01-01 02:47:24 15110 New problems (for December) added [monthly update]
en3 English -Morass- 2017-12-01 02:58:50 5798 New problems (for November) added [monthly update]
en2 English -Morass- 2017-11-09 04:09:11 11651 Added a few problems
en1 English -Morass- 2017-10-19 02:33:13 109672 Initial revision (published)