Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
2 days
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Problems

#	Name
769A	Year of University Entrance *special problem, implementation, sortings	800	x6417
768G	The Winds of Winter binary search, data structures	3300	x405
768F	Barrels and boxes brute force, combinatorics, math, number theory, probabilities	2300	x1129
768E	Game of Stones bitmasks, dp, games	2100	x3505
768D	Jon and Orbs dp, math, probabilities	2200	x3424
768C	Jon Snow and his Favourite Number brute force, dp, implementation, sortings	1800	x3974
768B	Code For 1 constructive algorithms, dfs and similar, divide and conquer	1600	x6970
768A	Oath of the Night's Watch constructive algorithms, sortings	900	x30838
767E	Change-free greedy	2400	x1072
767D	Cartons of milk binary search, data structures, greedy, sortings, two pointers	2100	x2414
767C	Garland dfs and similar, graphs, greedy, trees	2000	x4636
767B	The Queue brute force, greedy	2100	x2248
767A	Snacktower data structures, implementation	1100	x22686
766E	Mahmoud and a xor trip bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees	2100	x3468
766D	Mahmoud and a Dictionary data structures, dfs and similar, dp, dsu, graphs	2000	x3927
766C	Mahmoud and a Message brute force, dp, greedy, strings	1700	x4941
766B	Mahmoud and a Triangle constructive algorithms, geometry, greedy, math, number theory, sortings	1000	x38344
766A	Mahmoud and Longest Uncommon Subsequence constructive algorithms, strings	1000	x34538
765G	Math, math everywhere brute force, dp, math, meet-in-the-middle, number theory	3200	x116
765F	Souvenirs data structures	3100	x2558
765E	Tree Folding dfs and similar, dp, greedy, implementation, trees	2200	x1336
765D	Artsem and Saunders constructive algorithms, dsu, math	1700	x2600
765C	Table Tennis Game 2 math	1200	x7428
765B	Code obfuscation greedy, implementation, strings	1100	x7553
765A	Neverending competitions implementation, math	900	x9559
764B	Timofey and cubes constructive algorithms, implementation	900	x12676
764A	Taymyr is calling you brute force, implementation, math	800	x17097
763E	Timofey and our friends animals data structures, divide and conquer, dsu	2900	x551
763D	Timofey and a flat tree data structures, graphs, hashing, shortest paths, trees	2900	x646
763C	Timofey and remoduling brute force, implementation, math, number theory	2600	x781
763B	Timofey and rectangles constructive algorithms, geometry	2100	x3053
763A	Timofey and a tree dfs and similar, dp, dsu, graphs, implementation, trees	1600	x11867
762F	Tree nesting combinatorics, graphs, trees	2800	x478
762E	Radio stations binary search, data structures	2200	x1644
762D	Maximum path dp, greedy, implementation	2300	x1810
762C	Two strings binary search, hashing, strings, two pointers	2100	x2989
762B	USB vs. PS/2 greedy, implementation, sortings, two pointers	1400	x10574
762A	k-th divisor math, number theory	1400	x25780
761F	Dasha and Photos brute force, data structures, dp, implementation	2600	x523
761E	Dasha and Puzzle constructive algorithms, dfs and similar, graphs, greedy, trees	2000	x2370
761D	Dasha and Very Difficult Problem binary search, brute force, constructive algorithms, greedy, sortings	1700	x4211
761C	Dasha and Password brute force, dp, implementation	1500	x6037
761B	Dasha and friends brute force, implementation, math	1300	x7056
761A	Dasha and Stairs brute force, constructive algorithms, implementation, math	1000	x15125
760B	Frodo and pillows binary search, greedy	1500	x7802
760A	Petr and a calendar implementation, math	800	x8643
758F	Geometrical Progression brute force, math, number theory	2400	x713
758E	Broken Tree dfs and similar, dp, graphs, greedy, trees	2600	x552
758D	Ability To Convert constructive algorithms, dp, greedy, math, strings	2000	x2935
758C	Unfair Poll binary search, constructive algorithms, implementation, math	1700	x4052
758B	Blown Garland brute force, implementation, number theory	1100	x10729
758A	Holiday Of Equality implementation, math	800	x75273
757G	Can Bash Save the Day? data structures, divide and conquer, graphs, trees	3400	x648
757F	Team Rocket Rises Again data structures, graphs, shortest paths	2800	x1407
757E	Bash Plays with Functions brute force, combinatorics, dp, number theory	2500	x1546
757D	Felicity's Big Secret Revealed bitmasks, dp	2200	x1547
757C	Felicity is Coming! data structures, hashing, sortings, strings	1900	x2464
757B	Bash's Big Day greedy, math, number theory	1400	x11422
757A	Gotta Catch Em' All! implementation	1000	x11816
756F	Long number expression parsing, math, number theory	3400	x130
756E	Byteland coins combinatorics, dp, math	3200	x205
756D	Bacterial Melee brute force, combinatorics, dp, string suffix structures	2400	x1084
756C	Nikita and stack data structures	2200	x1466
756B	Travel Card binary search, dp	1600	x4539
756A	Pavel and barbecue constructive algorithms, dfs and similar	1700	x3217
755G	PolandBall and Many Other Balls combinatorics, divide and conquer, dp, fft, math, number theory	3200	x1024
755F	PolandBall and Gifts bitmasks, dp, greedy	2600	x1863
755E	PolandBall and White-Red graph constructive algorithms, graphs, shortest paths	2400	x917
755D	PolandBall and Polygon data structures	2000	x2675
755C	PolandBall and Forest dfs and similar, dsu, graphs, interactive, trees	1300	x14997
755B	PolandBall and Game binary search, data structures, games, greedy, sortings, strings	1100	x12878
755A	PolandBall and Hypothesis brute force, graphs, math, number theory	800	x19780
754E	Dasha and cyclic table bitmasks, brute force, fft, strings, trees	2600	x563
754D	Fedor and coupons binary search, data structures, greedy, sortings	2100	x2693
754C	Vladik and chat brute force, constructive algorithms, dp, implementation, strings	2200	x1096
754B	Ilya and tic-tac-toe game brute force, implementation	1100	x7505
754A	Lesha and array splitting constructive algorithms, greedy, implementation	1200	x9369
753C	Interactive Bulls and Cows (Hard) brute force, constructive algorithms, interactive	2500	x398
753B	Interactive Bulls and Cows (Easy) brute force, constructive algorithms, implementation	1600	x1438
753A	Santa Claus and Candies dp, greedy, math	1000	x9921
750H	New Year and Snowy Grid dfs and similar, dsu, graphs, interactive	3500	x239
750G	New Year and Binary Tree Paths bitmasks, brute force, combinatorics, dp	3200	x525
750F	New Year and Finding Roots constructive algorithms, implementation, interactive, trees	2800	x594
750E	New Year and Old Subsequence data structures, divide and conquer, dp, matrices	2600	x1875
750D	New Year and Fireworks brute force, data structures, dfs and similar, dp, implementation	1900	x3168
750C	New Year and Rating binary search, greedy, math	1600	x6991
750B	New Year and North Pole geometry, implementation	1300	x9720
750A	New Year and Hurry binary search, brute force, implementation, math	800	x92509
749E	Inversions After Shuffle data structures, probabilities	2400	x1256
749D	Leaving Auction binary search, data structures	2000	x2711
749C	Voting greedy, implementation, two pointers	1500	x6254
749B	Parallelogram is Back brute force, constructive algorithms, geometry	1200	x8932
749A	Bachgold Problem greedy, implementation, math, number theory	800	x57040
748F	Santa Clauses and a Soccer Championship constructive algorithms, dfs and similar, graphs, trees	2300	x715
748E	Santa Claus and Tangerines binary search, data structures, greedy, two pointers	2100	x1598
748D	Santa Claus and a Palindrome constructive algorithms, data structures, greedy	2100	x2053
748C	Santa Claus and Robot constructive algorithms, math	1400	x4855
748B	Santa Claus and Keyboard Check implementation, strings	1500	x5557
748A	Santa Claus and a Place in a Class implementation, math	800	x9345
747F	Igor and Interesting Numbers brute force, combinatorics, dp, math	2500	x482

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