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
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
2163C	Monopati brute force, combinatorics, dp, math, two pointers	1500	x9006
2163B	Siga ta Kymata constructive algorithms, greedy, implementation, math	1700	x9118
2163A	Souvlaki VS. Kalamaki brute force, greedy, math, sortings	800	x19571
2162H	Beautiful Problem dp	2900	x313
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
2162D	Beautiful Permutation binary search, interactive	1400	x12344
2162C	Beautiful XOR bitmasks, constructive algorithms, greedy	1100	x21295
2162B	Beautiful String brute force, constructive algorithms	1000	x27866
2162A	Beautiful Average brute force, greedy	800	x41550
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
2161C	Loyalty constructive algorithms, greedy, sortings, two pointers	1200	x12521
2161B	Make Connected brute force, implementation	1700	x5365
2161A	Round Trip games, greedy, implementation, math	800	x15704
2160C	Reverse XOR bitmasks	1300	x15132
2160B	Distinct Elements greedy, math	1100	x17739
2160A	MEX Partition math	800	x22433
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
2158C	Annoying Game dp, games, greedy	1400	x11030
2158B	Split constructive algorithms, greedy, math	1200	x13919
2158A	Suspension constructive algorithms, greedy, math	800	x23360
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
2157C	Meximum Array 2 constructive algorithms, greedy, implementation, math	1400	x9225
2157B	Expansion Plan 2 implementation, math	900	x12830
2157A	Dungeon Equilibrium greedy, implementation, sortings	800	x16477
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	x5367
2156C	Maximum GCD on Whiteboard greedy, math, number theory	1400	x12265
2156B	Strange Machine binary search, brute force, greedy, implementation	1000	x20739
2156A	Pizza Time brute force, constructive algorithms, greedy	800	x26830
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
2155C	The Ancient Wizards' Capes brute force, greedy, implementation	1500	x10236
2155B	Abraham's Great Escape constructive algorithms, graphs	1100	x16966
2155A	El fucho implementation, math	800	x25134
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	x5506
2154C1	No Cost Too Great (Easy Version) greedy, implementation, math, number theory	1400	x13527
2154B	Make it Zigzag constructive algorithms, greedy	1000	x19791
2154A	Notelock greedy, two pointers	800	x23146
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
2153C	Symmetrical Polygons constructive algorithms, geometry, greedy, implementation, sortings	1500	x11756
2153B	Bitwise Reversion bitmasks, greedy	800	x22580
2153A	Circle of Apple Trees greedy, sortings	800	x26344
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
2152C	Triple Removal data structures, greedy, math	1400	x12198
2152B	Catching the Krug games	1300	x12840
2152A	Increase or Smash greedy, implementation	800	x22296
2151C	Incremental Stay greedy, implementation, math	1400	x10248
2151A	Incremental Subarray math, strings	800	x17948
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
2150A	Incremental Path data structures, hashing, implementation	1300	x11673
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
2149E	Hidden Knowledge of the Ancients data structures, two pointers	1500	x9251
2149D	A and B strings	1200	x19312
2149C	MEX rose greedy	900	x28098
2149B	Unconventional Pairs greedy, sortings	800	x33000

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