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
2193F	Pizza Delivery dp, greedy	1600	x8436
2193E	Product Queries dp, math, number theory, shortest paths	1300	x15170
2193D	Monster Game binary search, sortings, two pointers	1100	x21536
2193C	Replace and Sum data structures, greedy	1000	x28680
2193B	Reverse a Permutation greedy	800	x30083
2193A	DBMB and the Array brute force, math	800	x42599
2192F	Fish Fight dp, dp, math, probabilities, probabilities	2900	x172
2192E	Swap to Rearrange constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, greedy, strings	2100	x2069
2192D	Cost of Tree dp, greedy, trees, trees	1800	x3530
2192C	All-in-one Gun binary search, greedy, math	1300	x10974
2192B	Flipping Binary String constructive algorithms, strings	1000	x14501
2192A	String Rotation Game brute force, strings	800	x17861
2191B	MEX Reordering constructive algorithms, sortings	1000	x19878
2191A	Array Coloring constructive algorithms	800	x27749
2190G	Maximize Determinant graphs	3300	x96
2190F	Xor Product bitmasks, dp	3300	x92
2190E	Median Permutation combinatorics	3200	x235
2190D	Prufer Vertex combinatorics, dsu, number theory, probabilities, trees	2500	x950
2190C	Comparable Permutations greedy, implementation, interactive, sortings, two pointers	2300	x1289
2190B2	Sub-RBS (Hard Version) dp, games, implementation, strings	1900	x3179
2190B1	Sub-RBS (Easy Version) combinatorics, constructive algorithms, dp, greedy, strings, two pointers	1400	x10653
2190A	Sorting Game constructive algorithms, games, greedy	1200	x17099
2189F	Zhora the Vacuum Cleaner data structures, dfs and similar, dp, greedy, implementation, sortings, trees	2800	x227
2189E	Majority Wins? constructive algorithms, greedy, math, strings	2600	x818
2189D2	Little String (Hard Version) combinatorics, dp, greedy, math, number theory	2200	x1943
2189D1	Little String (Easy Version) combinatorics, dp, greedy, math, number theory	1900	x3954
2189C2	XOR-convenience (Hard Version) bitmasks, constructive algorithms, math	1800	x6201
2189C1	XOR Convenience (Easy Version) bitmasks, constructive algorithms, math	1300	x13878
2189B	The Curse of the Frog constructive algorithms, greedy, math	1200	x15287
2189A	Table with Numbers greedy, implementation	800	x24346
2188B	Seats greedy	1000	x20983
2188A	Divisible Permutation constructive algorithms	800	x25873
2187G	Many Cartesian Trees greedy, sortings, trees	3500	x98
2187F2	Al Fine (Counting Version) dp, trees	3500	x70
2187F1	Al Fine (Maximizing Version) binary search, data structures, divide and conquer, trees	3100	x212
2187E	Doors and Keys brute force, data structures, dp	3500	x324
2187D	Cool Problem bitmasks, dp, math	2600	x633
2187C	Jerry and Tom data structures, dfs and similar, dsu, games, graphs, greedy, trees	2300	x1366
2187B	Shortest Statement Ever bitmasks, constructive algorithms, dp, greedy	1800	x5272
2187A	Restricted Sorting greedy, sortings	1300	x15848
2185H	BattleCows 2 binary search, brute force, data structures, dp, greedy	2500	x679
2185G	Mixing MEXes data structures, implementation, math	1800	x3298
2185F	BattleCows data structures, divide and conquer, implementation	1700	x4994
2185E	The Robotic Rush binary search, greedy, implementation, two pointers	1500	x10196
2185D	OutOfMemoryError data structures, implementation, math, two pointers	1100	x20645
2185C	Shifted MEX implementation, sortings	900	x28941
2185B	Prefix Max greedy	800	x40624
2185A	Perfect Root constructive algorithms, math	800	x43008
2184G	Nastiness of Segments binary search, data structures	1900	x2954
2184F	Cherry Tree dfs and similar, dp, graphs, trees	1900	x3887
2184E	Exquisite Array combinatorics, data structures, dsu, sortings	1800	x5758
2184D	Unfair Game combinatorics, dp, math	1600	x9482
2184C	Huge Pile binary search, dfs and similar, dp, graphs, math	1100	x21822
2184B	Hourglass math	1100	x24064
2184A	Social Experiment math	800	x38032
2183I2	Pairs Flipping (Hard Version) constructive algorithms	3500	x69
2183I1	Pairs Flipping (Easy Version) constructive algorithms	3500	x82
2183H	Minimise Cost binary search, dp, greedy, sortings	3500	x159
2183G	Snake Instructions constructive algorithms, greedy, interactive	3200	x221
2183F	Jumping Man brute force, combinatorics, dfs and similar, dp, trees	2500	x1122
2183E	LCM is Legendary Counting Master dp, math, number theory	2100	x2849
2183D2	Tree Coloring (Hard Version) combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees	2100	x2496
2183D1	Tree Coloring (Easy Version) constructive algorithms, dfs and similar, greedy, trees	1500	x8833
2183C	War Strategy binary search, greedy, math, two pointers	1500	x10654
2183B	Yet Another MEX Problem constructive algorithms, greedy	1100	x16154
2183A	Binary Array Game games	800	x23654
2182G	Short Garland combinatorics, data structures, dfs and similar, dp, trees	2800	x350
2182F2	Christmas Reindeer (hard version) bitmasks, brute force, combinatorics, data structures, greedy, math	2500	x1093
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1269
2182E	New Year's Gifts binary search, data structures, greedy, sortings, two pointers	1800	x5562
2182D	Christmas Tree Decoration combinatorics, dp, greedy, math	1600	x8938
2182C	Production of Snowmen brute force, combinatorics, dp	1200	x15494
2182B	New Year Cake brute force	800	x23411
2182A	New Year String constructive algorithms, greedy, implementation, strings	800	x25304
2181M	Medical Parity dp, strings	1700	x3471
2181L	LLM Training math, string suffix structures	2800	x132
2181K	Knit the Grid 2-sat, constructive algorithms, graphs, matrices	3500	x65
2181J	Jinx or Jackpot brute force, dp, math, probabilities	2300	x707
2181I	Irrigation Interlock geometry	3500	x49
2181H	Honey Cake brute force, math, number theory	1200	x6580
2181G	Greta's Game binary search, dp, graphs, greedy, math	2400	x647
2181F	Fragmented Nim games	1600	x3512
2181E	Elevator Against Humanity brute force, constructive algorithms, greedy, sortings	2900	x143
2181D	Doorway binary search, data structures, sortings	2000	x1354
2181C	Cacti Classification binary search, constructive algorithms, interactive, math	3200	x147
2181B	Battle of Arrays data structures, games, greedy	1400	x5653
2181A	Alphabet City binary search, math, strings	1300	x3716
2180H2	Bug Is Feature (Conditional Version) games	3500	x105
2180H1	Bug Is Feature (Unconditional Version) games	3400	x120
2180G	Balance bitmasks, combinatorics, implementation, math	3500	x134
2180F2	Control Car (Hard Version) combinatorics, dp, matrices, probabilities	3200	x223
2180F1	Control Car (Easy Version) combinatorics, dp, probabilities	2800	x405
2180E	No Effect XOR bitmasks, divide and conquer, dp, greedy, math	2300	x1736
2180D	Insolvable Disks data structures, dp, greedy, math	1900	x4248
2180C	XOR-factorization bitmasks, constructive algorithms, dp, greedy, number theory	1900	x6456
2180B	Ashmal greedy, strings	800	x24561
2180A	Carnival Wheel brute force, number theory	800	x25859
2179H	Blackslex and Plants bitmasks, data structures, dp, implementation, math	2200	x1300
2179G	Blackslex and Penguin Migration brute force, interactive, math	2200	x1207
2179F	Blackslex and Another RGB Walking communication, constructive algorithms, graphs, interactive, number theory, trees	2000	x2746

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