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)
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Problems

#	Name
2084D	Arcology On Permafrost binary search, brute force, constructive algorithms, greedy, math	1600	x8829
2084C	You Soared Afar With Grace constructive algorithms, data structures, greedy, implementation	1400	x11699
2084B	MIN = GCD greedy, math, number theory	1100	x16595
2084A	Max and Mod constructive algorithms, math	800	x17415
2082B	Floor or Ceil brute force, greedy	1600	x8237
2082A	Binary Matrix constructive algorithms, greedy	800	x11193
2081G2	Hard Formula (Hard Version) math	3400	x54
2081G1	Hard Formula math, number theory	3100	x81
2081F	Hot Matrix constructive algorithms, math	3300	x140
2081E	Quantifier combinatorics, dp, implementation	3300	x80
2081D	MST in Modulo Graph constructive algorithms, dsu, graphs, greedy, math, number theory, sortings, trees	2600	x1181
2081C	Quaternary Matrix bitmasks, constructive algorithms, greedy, implementation, matrices	2700	x353
2081B	Balancing greedy	2500	x997
2081A	Math Division bitmasks, dp, math, probabilities	1800	x4076
2080D	Order Statistics *special problem, binary search	3400	x47
2080C	Card Flip *special problem	2300	x203
2080B	Best Runner *special problem	1700	x495
2080A	Strong Connectivity Strikes Back *special problem, constructive algorithms, graphs	3200	x44
2079D	Cute Subsequences *special problem, sortings	1800	x682
2079C	Dreaming Is Not Harmful *special problem	2300	x222
2079B	Arithmetic Exercise *special problem, data structures, dp, greedy	2600	x155
2079A	Alice, Bob, And Two Arrays *special problem, data structures, dp, games	3300	x37
2078D	Scammy Game Ad dp, greedy, implementation	1800	x6529
2078B	Vicious Labyrinth constructive algorithms, graphs, greedy, implementation, math	1100	x18302
2078A	Final Verdict math	800	x23289
2077G	RGB Walking bitmasks, chinese remainder theorem, dfs and similar, graphs, number theory	3500	x135
2077F	AND x OR bitmasks, constructive algorithms, dp	3300	x261
2077E	Another Folding Strip combinatorics, constructive algorithms, data structures, divide and conquer, dp, greedy, math	2700	x606
2077D	Maximum Polygon brute force, data structures, greedy, implementation, math	3100	x339
2077C	Binary Subsequence Value Sum combinatorics, data structures, dp, fft, math, matrices	2300	x2379
2077B	Finding OR Sum bitmasks, constructive algorithms, implementation, interactive, math	1900	x3654
2077A	Breach of Faith constructive algorithms, greedy, math, sortings	1500	x14565
2075F	Beautiful Sequence Returns binary search, brute force, data structures, implementation	3000	x520
2075E	XOR Matrix bitmasks, combinatorics, dp, implementation, math	2500	x1184
2075D	Equalization bitmasks, brute force, dp, graphs, math	2000	x5820
2075C	Two Colors binary search, combinatorics, math	1500	x14348
2075B	Array Recoloring constructive algorithms, greedy	1300	x18822
2075A	To Zero greedy, math	800	x27901
2074G	Game With Triangles: Season 2 dp, geometry	2100	x2162
2074F	Counting Necessary Nodes bitmasks, divide and conquer, greedy, implementation, math	2000	x2473
2074E	Empty Triangle geometry, interactive, probabilities	1600	x6643
2074D	Counting Points brute force, data structures, geometry, implementation, two pointers	1400	x12052
2074C	XOR and Triangle bitmasks, brute force, geometry, greedy, probabilities	1100	x21965
2074B	The Third Side geometry, greedy, math	800	x34741
2074A	Draw a Square geometry, implementation	800	x44293
2073M	Can You Reach There?	3300	x81
2073L	Boarding Queue	1300	x1775
2073K	Book Sorting	2900	x238
2073J	Gathering Sharks	2000	x1168
2073I	Squares on Grid Lines	3100	x122
2073H	Secret Lilies and Roses interactive	2700	x370
2073G	Corrupted File	2200	x921
2073F	Hold the Star	3500	x67
2073E	Minus Operator interactive	3300	x76
2073D	Tower of Hanoi	2400	x563
2073C	Cactus Connectivity	2700	x336
2073B	Three-Dimensional Embedding	3500	x42
2073A	Control Towers	1900	x1241
2072G	I've Been Flipping Numbers for 300 Years and Calculated the Sum binary search, brute force, combinatorics, divide and conquer, math, number theory	2200	x2145
2072F	Goodbye, Banker Life 2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory	1700	x8425
2072E	Do You Love Your Hero and His Two-Hit Multi-Target Attacks? binary search, brute force, constructive algorithms, dp, geometry, greedy, math	1500	x12255
2072D	For Wizards, the Exam Is Easy, but I Couldn't Handle It brute force, greedy, implementation	1300	x17627
2072C	Creating Keys for StORages Has Become My Main Skill bitmasks, constructive algorithms, greedy	1200	x19558
2072B	Having Been a Treasurer in the Past, I Help Goblins Deceive combinatorics, constructive algorithms, strings	900	x30923
2072A	New World, New Me, New Array greedy, implementation, math	800	x40643
2071F	Towering Arrays binary search, data structures	2700	x332
2071E	LeaFall combinatorics, dp, probabilities, trees	2600	x819
2071D2	Infinite Sequence (Hard Version) bitmasks, brute force, constructive algorithms, data structures, dp, implementation, math	2500	x1100
2071D1	Infinite Sequence (Easy Version) bitmasks, brute force, dp, implementation, math	1800	x6691
2071C	Trapmigiano Reggiano constructive algorithms, data structures, dfs and similar, dp, greedy, sortings, trees	1700	x9688
2071B	Perfecto brute force, constructive algorithms, greedy, math	1100	x20870
2071A	The Play Never Ends math, number theory	800	x27832
2070F	Friends and Pizza bitmasks, divide and conquer, dp, fft	3000	x369
2070E	Game with Binary String constructive algorithms, data structures, divide and conquer, games, greedy, math	2200	x1853
2070D	Tree Jumps dfs and similar, dp, trees	1600	x11086
2070C	Limited Repainting binary search, greedy	1500	x13812
2070B	Robot Program brute force, implementation, math	1100	x19679
2070A	FizzBuzz Remixed brute force, math	800	x26487
2069F	Graph Inclusion data structures, dfs and similar, divide and conquer, dsu, graphs	2800	x788
2069E	A, B, AB and BA constructive algorithms, greedy, sortings, strings	2300	x1904
2069D	Palindrome Shuffle binary search, greedy, hashing, strings, two pointers	1800	x7044
2069C	Beautiful Sequence combinatorics, dp, greedy, two pointers	1500	x14804
2069B	Set of Strangers greedy, matrices	1200	x18801
2069A	Was there an Array? graph matchings, greedy	800	x26540
2068K	Amusement Park Rides flows, graphs	3000	x206
2068J	The Ultimate Wine Tasting Event combinatorics, greedy	2000	x1611
2068I	Pinball graphs, shortest paths	3500	x61
2068H	Statues constructive algorithms, greedy, math	2700	x405
2068G	A Very Long Hike shortest paths	3500	x62
2068F	Mascot Naming brute force, greedy, implementation, strings	1900	x1482
2068E	Porto Vs. Benfica data structures, dfs and similar, dsu, graphs, shortest paths	2800	x369
2068D	Morse Code dp, sortings, trees	3100	x265
2068C	Ads binary search, greedy, two pointers	2100	x1637
2068B	Urban Planning constructive algorithms	3100	x143
2068A	Condorcet Elections constructive algorithms, graphs, greedy, probabilities	2300	x996
2067C	Devyatkino brute force, dfs and similar, greedy, math	1500	x12716
2067B	Two Large Bags brute force, dp, greedy, sortings	1200	x18970
2067A	Adjacent Digit Sums brute force, constructive algorithms, math	800	x25678
2066F	Curse constructive algorithms, dp, math	3300	x71
2066E	Tropical Season binary search, data structures, greedy, implementation	3300	x420

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