Problemset - Codeforces

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Educational Codeforces Round 173 (Rated for Div. 2)
31:11:35
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Problems

#	Name
1531D	Редактируем Зингер \| color special problem, special problem		x354
1531C	Симметричный амфитеатр *special problem, constructive algorithms, dp		x650
1531B2	Мониторинг *special problem		x769
1531B1	Мониторинг special problem, special problem		x1114
1531A	Зингер \| color *special problem, implementation		x1453
1530H	Turing's Award data structures, dp	3400	x165
1530G	What a Reversal constructive algorithms	3300	x146
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x835
1530E	Minimax constructive algorithms, greedy, strings	2100	x3003
1530D	Secret Santa constructive algorithms, flows, graphs, greedy, math	1600	x9332
1530C	Pursuit binary search, brute force, greedy, sortings	1200	x14779
1530B	Putting Plates constructive algorithms, implementation	800	x15830
1530A	Binary Decimal greedy, math	800	x21167
1529B	Sifid and Strange Subsequences greedy, math, sortings	1100	x20658
1529A	Eshag Loves Big Arrays constructive algorithms, greedy, math	800	x29914
1528F	AmShZ Farm combinatorics, fft, math	3300	x291
1528E	Mashtali and Hagh Trees combinatorics, dp, trees	2900	x536
1528D	It's a bird! No, it's a plane! No, it's AaParsa! constructive algorithms, graphs, shortest paths	2500	x1460
1528C	Trees of Tranquillity data structures, dfs and similar, greedy, trees	2300	x2680
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8794
1528A	Parsa's Humongous Tree dfs and similar, divide and conquer, dp, greedy, trees	1600	x15161
1527E	Partition Game binary search, data structures, divide and conquer, dp	2500	x2395
1527D	MEX Tree combinatorics, dfs and similar, implementation, math, trees	2400	x1938
1527C	Sequence Pair Weight hashing, implementation, math	1600	x13750
1527B2	Palindrome Game (hard version) constructive algorithms, games	1900	x8039
1527B1	Palindrome Game (easy version) constructive algorithms, games	1200	x26744
1527A	And Then There Were K bitmasks	800	x36309
1526F	Median Queries constructive algorithms, interactive, probabilities	3000	x295
1526E	Oolimry and Suffix Array combinatorics, constructive algorithms, math	2400	x1072
1526D	Kill Anton brute force, constructive algorithms, data structures, math, strings	2200	x2503
1526C2	Potions (Hard Version) data structures, greedy	1600	x23396
1526C1	Potions (Easy Version) brute force, data structures, dp, greedy	1500	x23207
1526B	I Hate 1111 dp, math, number theory	1400	x31341
1526A	Mean Inequality constructive algorithms, sortings	800	x24304
1525F	Goblins And Gnomes brute force, dp, flows, graph matchings	2800	x334
1525E	Assimilation IV combinatorics, dp, math, probabilities, two pointers	2100	x2122
1525D	Armchairs dp, flows, graph matchings, greedy	1800	x9916
1525C	Robot Collisions data structures, greedy, implementation, sortings	2000	x4519
1525B	Permutation Sort constructive algorithms, greedy	900	x25112
1525A	Potion-making math, number theory	800	x25718
1523H	Hopping Around the Array data structures, dp	3500	x309
1523G	Try Booking data structures, divide and conquer	3200	x470
1523F	Favorite Game bitmasks, dp	3300	x438
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1726
1523D	Love-Hate bitmasks, brute force, dp, probabilities	2400	x2201
1523C	Compression and Expansion brute force, data structures, greedy, implementation, trees	1600	x8854
1523B	Lord of the Values constructive algorithms	1100	x12130
1523A	Game of Life implementation	800	x13538
1521E	Nastia and a Beautiful Matrix binary search, constructive algorithms, dp, greedy	2700	x682
1521D	Nastia Plays with a Tree constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees	2500	x1988
1521C	Nastia and a Hidden Permutation constructive algorithms, interactive	2000	x4396
1521B	Nastia and a Good Array constructive algorithms, math, number theory	1300	x21578
1521A	Nastia and Nearly Good Numbers constructive algorithms, math, number theory	1000	x37859
1520G	To Go Or Not To Go? brute force, dfs and similar, graphs, greedy, implementation, shortest paths	2200	x3770
1520F2	Guess the K-th Zero (Hard version) binary search, constructive algorithms, data structures, interactive	2200	x3061
1520F1	Guess the K-th Zero (Easy version) binary search, interactive	1600	x12143
1520E	Arranging The Sheep greedy, math	1400	x21989
1520D	Same Differences data structures, hashing, math	1200	x48718
1520C	Not Adjacent Matrix constructive algorithms	1000	x32121
1520B	Ordinary Numbers brute force, math, number theory	800	x45112
1520A	Do Not Be Distracted! brute force, implementation	800	x52632
1519F	Chests and Keys bitmasks, brute force, dfs and similar, dp, flows	3200	x442
1519E	Off by One constructive algorithms, dfs and similar, geometry, graphs, sortings, trees	2700	x832
1519D	Maximum Sum of Products brute force, dp, implementation, math, two pointers	1600	x15511
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x17309
1519B	The Cake Is a Lie dp, math	800	x31180
1519A	Red and Blue Beans math	800	x29124
1517H	Fly Around the World dp, geometry	3500	x75
1517G	Starry Night Camping constructive algorithms, flows, graphs	3300	x516
1517F	Reunion combinatorics, dp, trees	3200	x472
1517E	Group Photo binary search, data structures, implementation, two pointers	2500	x989
1517D	Explorer Space dp, graphs, shortest paths	1800	x7859
1517C	Fillomino 2 constructive algorithms, dfs and similar, greedy, implementation	1400	x13462
1517B	Morning Jogging constructive algorithms, greedy, sortings	1200	x13321
1517A	Sum of 2050 greedy, math	800	x25682
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x893
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x4486
1516C	Baby Ehab Partitions Again bitmasks, constructive algorithms, dp, math	1700	x12087
1516B	AGAGA XOOORRR bitmasks, brute force, dp, greedy	1500	x19879
1516A	Tit for Tat greedy	800	x23637
1515I	Phoenix and Diamonds binary search, data structures, sortings	3400	x286
1515H	Phoenix and Bits bitmasks, brute force, data structures, sortings	3500	x253
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x1046
1515F	Phoenix and Earthquake constructive algorithms, dfs and similar, dsu, graphs, greedy, trees	2600	x1845
1515E	Phoenix and Computers combinatorics, dp, math	2200	x3687
1515D	Phoenix and Socks greedy, sortings, two pointers	1500	x11502
1515C	Phoenix and Towers constructive algorithms, data structures, greedy	1400	x17346
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x25224
1515A	Phoenix and Gold constructive algorithms, greedy, math	800	x20319
1514E	Baby Ehab's Hyper Apartment binary search, graphs, interactive, sortings, two pointers	2700	x630
1514D	Cut and Stick binary search, data structures, greedy, implementation, sortings	2000	x4392
1514C	Product 1 Modulo N greedy, number theory	1600	x15497
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x25875
1514A	Perfectly Imperfect Array math, number theory	800	x24340
1513F	Swapping Problem brute force, constructive algorithms, data structures, sortings	2500	x1294
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x1535
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x5579
1513C	Add One dp, matrices	1600	x14385
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x15116
1513A	Array and Peaks constructive algorithms, implementation	800	x19466