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
2165E	Rainbow Branch constructive algorithms, dp, greedy, trees	3200	x255
2165D	Path Split graph matchings, greedy	2500	x894
2165C	Binary Wine bitmasks, greedy, math	2000	x3512
2165B	Marble Council dp, math, sortings	1900	x4527
2164H	PalindromePalindrome data structures, strings	3400	x42
2164G	Pointless Machine constructive algorithms, graphs, interactive, trees	3300	x203
2164F2	Chain Prefix Rank (Hard Version) binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees	2900	x420
2164F1	Chain Prefix Rank (Easy Version) combinatorics, dfs and similar, dp, math, trees	2600	x648
2164E	Journey data structures, dfs and similar, dsu, graphs, greedy	2300	x1576
2164D	Copy String greedy, implementation, strings, two pointers	1800	x4954
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x634
2163D2	Diadrash (Hard Version) binary search, interactive, math, sortings	2500	x1495
2163D1	Diadrash (Easy Version) binary search, brute force, divide and conquer, implementation, interactive	2100	x2727
2163B	Siga ta Kymata constructive algorithms, greedy, implementation, math	1700	x9118
2162H	Beautiful Problem dp	2900	x312
2162G	Beautiful Tree constructive algorithms, math, probabilities, trees	2200	x2808
2162F	Beautiful Intervals constructive algorithms, greedy	2100	x2909
2162E	Beautiful Palindromes constructive algorithms, greedy, schedules	1600	x9311
2161H	Cycle Sort data structures	3500	x63
2161G	Bitwise And Equals bitmasks, greedy	3500	x91
2161F	SubMST combinatorics, graphs, trees	3000	x344
2161E	Left is Always Right combinatorics, implementation, math	2400	x780
2161D	Locked Out binary search, data structures, dp, greedy	2100	x2765
2161B	Make Connected brute force, implementation	1700	x5365
2159F	Grand Finale: Snakes binary search, interactive, ternary search	3500	x134
2159E	Super-Short-Polynomial-San math, meet-in-the-middle	3500	x195
2159D2	Inverse Minimum Partition (Hard Version) dp, greedy, math	3200	x393
2159D1	Inverse Minimum Partition (Easy Version) binary search, brute force, dp, geometry, greedy, math, two pointers	2500	x1017
2159C	Twin Polynomials combinatorics, graph matchings, math	2300	x1686
2159B	Rectangles brute force, data structures, dp, dsu, greedy, implementation, two pointers	2100	x2306
2159A	MAD Interactive Problem constructive algorithms, implementation, interactive	1700	x8123
2158F2	Distinct GCDs (Hard Version) combinatorics, constructive algorithms, graphs, math, number theory, number theory	3000	x245
2158F1	Distinct GCDs (Easy Version) constructive algorithms, graphs, math, number theory	2600	x400
2158E	Sink data structures, divide and conquer, dsu, graphs, implementation	2600	x624
2158D	Palindrome Flipping brute force, constructive algorithms, graphs, implementation, shortest paths, strings	2000	x3278
2157I	Hyper Smawk Bros dp, dp, games	3500	x171
2157H	Keygen 3 brute force, combinatorics, constructive algorithms, dfs and similar, math	3200	x116
2157G	Isaac's Queries bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities	2800	x408
2157F	Git Gud brute force, constructive algorithms, divide and conquer, math, ternary search	2400	x1287
2157E	Adjusting Drones binary search, brute force, data structures, dp, dsu, greedy, implementation, sortings	1900	x3563
2157D	Billion Players Game binary search, greedy, math, sortings, ternary search, two pointers	1600	x5989
2156F2	Strange Operation (Hard Version) data structures, greedy, trees	3000	x243
2156F1	Strange Operation (Easy Version) brute force, data structures, greedy, implementation, sortings	2200	x1616
2156E	Best Time to Buy and Sell Stock binary search, brute force, data structures, dp, games, graphs, greedy	2500	x959
2156D	Find the Last Number binary search, bitmasks, constructive algorithms, interactive	1900	x5366
2155F	Juan's Colorful Tree data structures, dfs and similar, dfs and similar, dsu, graphs, graphs, meet-in-the-middle, trees	2800	x637
2155E	Mimo & Yuyu games, greedy, math	2200	x2832
2155D	Batteries brute force, constructive algorithms, graph matchings, graphs, interactive, math	1800	x5857
2154F2	Bombing (Hard Version) combinatorics, dp	3300	x175
2154F1	Bombing (Easy Version) brute force, combinatorics, constructive algorithms, implementation, math	2700	x563
2154E	No Mind To Think binary search, divide and conquer, greedy, sortings, ternary search, two pointers	2500	x1202
2154D	Catshock constructive algorithms, dfs and similar, graphs, trees, two pointers	1900	x4755
2154C2	No Cost Too Great (Hard Version) greedy, math, number theory	2000	x5505
2153F	Odd Queries on Odd Array bitmasks, brute force, data structures, implementation, trees	2900	x323
2153E	Zero Trailing Factorial brute force, math, number theory	2400	x984
2153D	Not Alone dp, greedy	1800	x6283
2152H2	Victorious Coloring (Hard Version) data structures, greedy, schedules	3500	x199
2152H1	Victorious Coloring (Easy Version) dfs and similar, dp, greedy	2900	x610
2152G	Query Jungle data structures, implementation, math, matrices, trees	2900	x712
2152F	Triple Attack data structures, greedy	2500	x1033
2152E	Monotone Subsequence constructive algorithms, graphs, greedy, interactive, math	2100	x2777
2152D	Division Versus Addition games, greedy, math	1700	x6743
2150G	Counting Is Fun: The Finale combinatorics, implementation	3500	x82
2150F	Cycle Closing constructive algorithms, graphs, implementation, shortest paths, trees	3000	x203
2150E2	Hidden Single (Version 2) binary search, divide and conquer, interactive, math, probabilities	2800	x597
2150E1	Hidden Single (Version 1) divide and conquer, interactive, math, probabilities, sortings	2600	x1025
2150D	Attraction Theory combinatorics, dp, math	2700	x751
2150C	Limited Edition Shop data structures, dp	2100	x2647
2150B	Grid Counting combinatorics, implementation, math	1700	x6044
2149G	Buratsuta 3 binary search, brute force, data structures, divide and conquer, probabilities	2100	x2664
2149F	Nezuko in the Clearing binary search, math, ternary search	1900	x4800
2148G	Farmer John's Last Wish binary search, data structures, math, number theory	1900	x4188
2148F	Gravity Falls greedy, implementation, sortings	1800	x6579
2147I2	Longest Increasing Path (Hard Version) constructive algorithms, math	3500	x104
2147I1	Longest Increasing Path (Easy Version) constructive algorithms, math	3300	x134
2147H	Maxflow GCD Coloring constructive algorithms, flows, graphs	3500	x188
2147G	Modular Tetration combinatorics, math, number theory	3100	x359
2147F	Exchange Queries combinatorics, data structures, greedy	2800	x663
2147E	Maximum OR Popcount binary search, bitmasks, brute force, data structures, greedy	2300	x2116
2147D	Game on Array games, greedy	1700	x7468
2146F	Bubble Sort brute force, combinatorics, dp	2900	x301
2146E	Yet Another MEX Problem brute force, constructive algorithms, data structures, divide and conquer, greedy, hashing	2300	x2051
2146D2	Max Sum OR (Hard Version) bitmasks, constructive algorithms, divide and conquer, greedy	2000	x4029
2145G	Cost of Coloring combinatorics, divide and conquer, dp, fft, math	2900	x523
2145F	Long Journey dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory	2500	x981
2145E	Predicting Popularity binary search, data structures, greedy, sortings	2100	x3062
2145D	Inversion Value of a Permutation constructive algorithms, dfs and similar, dp	1800	x6657
2144F	Bracket Groups brute force, constructive algorithms, dp, string suffix structures, strings	2700	x917
2144E2	Looking at Towers (difficult version) combinatorics, data structures, dp	2500	x1435
2144E1	Looking at Towers (easy version) combinatorics, dp	2200	x2555
2144D	Price Tags brute force, dp, math	1800	x6994
2143F	Increasing Xor bitmasks, data structures, math	2700	x422
2143E	Make Good constructive algorithms, greedy, math, strings	2400	x1914
2143D2	Inversion Graph Coloring (Hard Version) binary search, combinatorics, data structures, dp, two pointers	2200	x2763
2143D1	Inversion Graph Coloring (Easy Version) combinatorics, data structures, dp, greedy, two pointers	1800	x6389
2141I	Color the Tree *special problem	3500	x56
2141H	Merging Vertices in a Graph *special problem, dfs and similar, dsu, graphs	2700	x84
2141G	Good Robot Paths *special problem, data structures, geometry, sortings	2800	x62
2141F	Array Reduction *special problem, greedy	2200	x141
2141E	Perfect Cut *special problem, dp, greedy	2100	x257

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