Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1621A	Stable Arrangement of Rooks constructive algorithms	800	x23790
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x899
1620F	Bipartite Array dp, greedy	2800	x612
1620E	Replace the Numbers constructive algorithms, data structures, dsu, implementation	1900	x8265
1620D	Exact Change brute force, constructive algorithms, greedy	2000	x4201
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x6568
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x21175
1620A	Equal or Not Equal constructive algorithms, dsu, implementation	800	x21580
1619H	Permutation and Queries brute force, data structures, divide and conquer, two pointers	2400	x1143
1619G	Unusual Minesweeper binary search, dfs and similar, dsu, greedy, sortings	2000	x2403
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2098
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x9172
1619D	New Year's Problem binary search, greedy, sortings	1800	x7547
1619C	Wrong Addition implementation	1200	x20966
1619B	Squares and Cubes implementation, math	800	x30772
1619A	Square String? implementation, strings	800	x51520
1618G	Trader Problem data structures, dsu, greedy, sortings	2200	x1568
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4206
1618E	Singers' Tour constructive algorithms, math	1700	x7182
1618D	Array and Operations dp, greedy, math	1300	x18920
1618C	Paint the Array math	1100	x23034
1618B	Missing Bigram implementation	800	x22615
1618A	Polycarp and Sums of Subsequences math, sortings	800	x32275
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x871
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x1788
1617D1	Too Many Impostors (easy version) constructive algorithms, implementation, interactive	1800	x4680
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x14986
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x23340
1617A	Forbidden Subsequence constructive algorithms, greedy, sortings, strings	800	x16275
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x946
1616G	Just Add an Edge dfs and similar, dp, graphs	3500	x280
1616F	Tricolor Triangles brute force, graphs, math, matrices	2900	x593
1616E	Lexicographically Small Enough brute force, data structures, greedy, strings	2200	x2483
1616D	Keep the Average High dp, greedy, math	2000	x4888
1616C	Representative Edges brute force, geometry, implementation, math	1500	x12237
1616B	Mirror in the String greedy, strings	1100	x19658
1616A	Integer Diversity implementation	800	x22699
1615H	Reindeer Games binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths	3000	x327
1615G	Maximum Adjacent Pairs constructive algorithms, graph matchings	3300	x150
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x877
1615E	Purple Crayon data structures, dfs and similar, games, graphs, greedy, math, sortings, trees	2400	x1479
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x1891
1615C	Menorah brute force, graphs, greedy, math	1600	x8373
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15956
1615A	Closing The Gap greedy, math	800	x20748
1614E	Divan and a Cottage binary search, data structures	2600	x826
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2348
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x3894
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10247
1614B	Divan and a New Project constructive algorithms, sortings	1000	x19274
1614A	Divan and a Store brute force, constructive algorithms, greedy	800	x23258
1613F	Tree Coloring combinatorics, divide and conquer, fft	2600	x687
1613E	Crazy Robot dfs and similar, graphs	2000	x5167
1613D	MEX Sequences dp, math	1900	x4607
1613C	Poisoned Dagger binary search	1200	x24477
1613B	Absent Remainder greedy, implementation, sortings	1000	x21644
1613A	Long Comparison implementation, math	900	x24492
1612G	Max Sum Array combinatorics, constructive algorithms, greedy, sortings	2500	x841
1612F	Armor and Weapons brute force, dp, greedy, shortest paths	2800	x612
1612E	Messages brute force, dp, greedy, probabilities, sortings	2000	x2503
1612D	X-Magic Pair math, number theory	1600	x9141
1612C	Chat Ban binary search, math	1300	x17427
1612B	Special Permutation constructive algorithms, greedy	900	x17199
1612A	Distance brute force, constructive algorithms	800	x17655
1611G	Robot and Candies data structures, graph matchings, greedy	2500	x645
1611F	ATM and Students binary search, data structures, two pointers	1800	x6447
1611E2	Escape The Maze (hard version) dfs and similar, dp, greedy, shortest paths, trees	1900	x3820
1611E1	Escape The Maze (easy version) dfs and similar, greedy, shortest paths, trees, two pointers	1700	x7272
1611D	Weights Assignment For Tree Edges constructive algorithms, trees	1500	x9856
1611C	Polycarp Recovers the Permutation constructive algorithms	1000	x18353
1611B	Team Composition: Programmers and Mathematicians binary search, constructive algorithms, math	800	x29515
1611A	Make Even constructive algorithms, math	800	x31410
1610I	Mashtali vs AtCoder games, trees	3100	x283
1610H	Squid Game data structures, dfs and similar, greedy, trees	3100	x495
1610G	AmShZ Wins a Bet data structures, greedy, hashing	3300	x441
1610F	Mashtali: a Space Oddysey constructive algorithms, dfs and similar, graphs	3000	x536
1610E	AmShZ and G.O.A.T. binary search, brute force, greedy, implementation, math	2300	x1670
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2704
1610C	Keshi Is Throwing a Party binary search, greedy	1600	x11566
1610B	Kalindrome Array greedy, two pointers	1100	x15889
1610A	Anti Light's Cell Guessing math	900	x16091
1609H	Pushing Robots	3500	x92
1609G	A Stroll Around the Matrix data structures, greedy, math	3000	x398
1609F	Interesting Sections data structures, divide and conquer, meet-in-the-middle, two pointers	2800	x784
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x2081
1609D	Social Network dsu, graphs, greedy, implementation, trees	1600	x7302
1609C	Complex Market Analysis binary search, dp, implementation, number theory, schedules, two pointers	1400	x9742
1609B	William the Vigilant implementation, strings	1100	x11687
1609A	Divide and Multiply greedy, implementation, math, number theory	900	x17092
1608G	Alphabetic Tree binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees	3500	x157
1608F	MEX counting combinatorics, dp, implementation	3200	x595
1608E	The Cells on the Paper binary search, implementation, sortings	2800	x434
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1392
1608C	Game Master data structures, dfs and similar, dp, graphs, greedy, two pointers	1700	x6649
1608B	Build the Permutation constructive algorithms, greedy	1200	x11715
1608A	Find Array constructive algorithms, math	800	x19046
1607H	Banquet Preparations 2 greedy, sortings, two pointers	2200	x1240
1607G	Banquet Preparations 1 greedy	2200	x1560
1607F	Robot on the Board 2 brute force, dfs and similar, graphs, implementation	2300	x1942
1607E	Robot on the Board 1 implementation	1600	x9310