Problemset - Codeforces

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

#	Name
1623A	Robot Cleaner brute force, implementation, math	800	x20719
1622F	Quadratic Set constructive algorithms, hashing, math, number theory	2900	x858
1622E	Math Test bitmasks, brute force, greedy	2200	x2243
1622D	Shuffle combinatorics, math, two pointers	2000	x4641
1622C	Set or Decrease binary search, brute force, greedy, sortings	1600	x15535
1622B	Berland Music data structures, greedy, math, sortings	1000	x22310
1622A	Construct a Rectangle geometry, math	800	x32020
1621I	Two Sequences data structures, hashing, string suffix structures	3500	x144
1621H	Trains and Airplanes dfs and similar, graphs, shortest paths, trees	3500	x199
1621G	Weighted Increasing Subsequences data structures, dp, math	3200	x778
1621F	Strange Instructions data structures, greedy, implementation	2700	x636
1621E	New School binary search, data structures, dp, greedy, implementation, sortings	2300	x1919
1621D	The Winter Hike constructive algorithms, greedy, math	2100	x4390
1621C	Hidden Permutations dfs and similar, interactive, math	1700	x7505
1621B	Integers Shop data structures, greedy, implementation	1500	x14550
1621A	Stable Arrangement of Rooks constructive algorithms	800	x24764
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x1155
1620F	Bipartite Array dp, greedy	2800	x750
1620E	Replace the Numbers constructive algorithms, data structures, dsu, implementation	1900	x9662
1620D	Exact Change brute force, constructive algorithms, greedy	2000	x4806
1620C	BA-String brute force, dp, greedy, implementation, math	1800	x7272
1620B	Triangles on a Rectangle geometry, greedy, math	1000	x31422
1620A	Equal or Not Equal constructive algorithms, dsu, implementation	800	x23149
1619H	Permutation and Queries brute force, data structures, divide and conquer, two pointers	2400	x1432
1619G	Unusual Minesweeper binary search, dfs and similar, dsu, greedy, sortings	2000	x2734
1619F	Let's Play the Hat? brute force, constructive algorithms, greedy, math	2000	x2339
1619E	MEX and Increments constructive algorithms, data structures, dp, greedy, implementation, math, sortings	1700	x10202
1619D	New Year's Problem binary search, greedy, sortings	1800	x8456
1619C	Wrong Addition implementation	1200	x22653
1619B	Squares and Cubes implementation, math	800	x32936
1619A	Square String? implementation, strings	800	x62766
1618G	Trader Problem data structures, dsu, greedy, sortings	2200	x1932
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4730
1618E	Singers' Tour constructive algorithms, math	1700	x7788
1618D	Array and Operations dp, greedy, math	1300	x20889
1618C	Paint the Array math	1100	x32369
1618B	Missing Bigram implementation	800	x23831
1618A	Polycarp and Sums of Subsequences math, sortings	800	x34372
1617E	Christmas Chocolates dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees	2700	x1016
1617D2	Too Many Impostors (hard version) constructive algorithms, implementation, interactive, math	2400	x2029
1617D1	Too Many Impostors (easy version) constructive algorithms, implementation, interactive	1800	x5167
1617C	Paprika and Permutation binary search, greedy, math, sortings	1300	x15994
1617B	GCD Problem brute force, constructive algorithms, math, number theory	900	x26802
1617A	Forbidden Subsequence constructive algorithms, greedy, sortings, strings	800	x17005
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x1233
1616G	Just Add an Edge dfs and similar, dp, graphs	3500	x424
1616F	Tricolor Triangles brute force, graphs, math, matrices	2900	x720
1616E	Lexicographically Small Enough brute force, data structures, greedy, strings	2200	x2716
1616D	Keep the Average High dp, greedy, math	2000	x5563
1616C	Representative Edges brute force, geometry, implementation, math	1500	x13199
1616B	Mirror in the String greedy, strings	1100	x20703
1616A	Integer Diversity implementation	800	x23825
1615H	Reindeer Games binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths	3000	x386
1615G	Maximum Adjacent Pairs constructive algorithms, graph matchings	3300	x172
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x1149
1615E	Purple Crayon data structures, dfs and similar, games, graphs, greedy, math, sortings, trees	2400	x1699
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x2134
1615C	Menorah brute force, graphs, greedy, math	1600	x9192
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x17909
1615A	Closing The Gap greedy, math	800	x21579
1614E	Divan and a Cottage binary search, data structures	2600	x948
1614D2	Divan and Kostomuksha (hard version) dp, number theory	2300	x2742
1614D1	Divan and Kostomuksha (easy version) dp, number theory	2100	x4474
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x11309
1614B	Divan and a New Project constructive algorithms, sortings	1000	x28992
1614A	Divan and a Store brute force, constructive algorithms, greedy	800	x24591
1613F	Tree Coloring combinatorics, divide and conquer, fft	2600	x830
1613E	Crazy Robot dfs and similar, graphs	2000	x5888
1613D	MEX Sequences dp, math	1900	x5301
1613C	Poisoned Dagger binary search	1200	x29677
1613B	Absent Remainder greedy, implementation, sortings	1000	x23310
1613A	Long Comparison implementation, math	900	x26625
1612G	Max Sum Array combinatorics, constructive algorithms, greedy, sortings	2500	x1000
1612F	Armor and Weapons brute force, dp, greedy, shortest paths	2800	x693
1612E	Messages brute force, dp, greedy, probabilities, sortings	2000	x2817
1612D	X-Magic Pair math, number theory	1600	x10257
1612C	Chat Ban binary search, math	1300	x25759
1612B	Special Permutation constructive algorithms, greedy	900	x18428
1612A	Distance brute force, constructive algorithms	800	x18211
1611G	Robot and Candies data structures, graph matchings, greedy	2500	x741
1611F	ATM and Students binary search, data structures, two pointers	1800	x7370
1611E2	Escape The Maze (hard version) dfs and similar, dp, greedy, shortest paths, trees	1900	x4314
1611E1	Escape The Maze (easy version) dfs and similar, greedy, shortest paths, trees, two pointers	1700	x8345
1611D	Weights Assignment For Tree Edges constructive algorithms, trees	1500	x11594
1611C	Polycarp Recovers the Permutation constructive algorithms	1000	x19356
1611B	Team Composition: Programmers and Mathematicians binary search, constructive algorithms, math	800	x31909
1611A	Make Even constructive algorithms, math	800	x33408
1610I	Mashtali vs AtCoder games, trees	3100	x338
1610H	Squid Game data structures, dfs and similar, greedy, trees	3100	x628
1610G	AmShZ Wins a Bet data structures, greedy, hashing	3300	x654
1610F	Mashtali: a Space Oddysey constructive algorithms, dfs and similar, graphs	3000	x706
1610E	AmShZ and G.O.A.T. binary search, brute force, greedy, implementation, math	2300	x1923
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x3038
1610C	Keshi Is Throwing a Party binary search, greedy	1600	x15605
1610B	Kalindrome Array greedy, two pointers	1100	x23356
1610A	Anti Light's Cell Guessing math	900	x17071
1609H	Pushing Robots	3500	x104
1609G	A Stroll Around the Matrix data structures, greedy, math	3000	x484
1609F	Interesting Sections data structures, divide and conquer, meet-in-the-middle, two pointers	2800	x960
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x2451

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