Problemset - Codeforces

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

#	Name
2207H3	Bowser's Castle (Hard Version) constructive algorithms, divide and conquer, interactive, trees, two pointers		x55
2207H2	Bowser's Castle (Medium Version) constructive algorithms, divide and conquer, interactive, trees, two pointers		x39
2207H1	Bowser's Castle (Easy Version) binary search, constructive algorithms, divide and conquer, greedy, interactive, trees		x51
2207G	Toothless constructive algorithms, dfs and similar, dsu	3300	x154
2207F	Hanabi binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy	2900	x268
2207E2	N-MEX (Counting Version) combinatorics, constructive algorithms, math	2400	x854
2207E1	N-MEX (Constructive Version) constructive algorithms, greedy	2100	x1649
2207D	Boxed Like a Fish dfs and similar, dp, games, shortest paths, trees	2200	x2098
2207C	Where's My Water? data structures, divide and conquer, dp, math	1600	x5377
2207B	One Night At Freddy's games, greedy, sortings	1600	x5753
2207A	1-1 greedy, strings	800	x13601
2206M	Deformed Balance	2900	x46
2206L	Onion	3500	x38
2206K	Time Display Stickers binary search	1300	x1375
2206J	Worldwide Playlist math	1700	x978
2206I	Growth Factor combinatorics, dp, math, number theory	2900	x165
2206H	Reflect Sort number theory	1800	x832
2206G	Extra Transition graphs	3100	x75
2206F	Minesweeper String fft, number theory	2400	x415
2206E	Parallel Sums data structures, geometry	2500	x397
2206D	Christmas Tree Un-decoration data structures, dp, trees	2600	x238
2206C	Upside Down Dijkstra dfs and similar	2200	x619
2206B	Subtree Removal Game binary search, games, trees	2500	x343
2206A	Compare Suffixes interactive	3500	x83
2205G	Simons and Diophantus Equation bitmasks, brute force, data structures, math, number theory	3000	x202
2205F	Simons and Reconstructing His Roads constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, data structures, data structures, dsu, graphs	2400	x636
2205E	Simons and Dividing the Rhythm combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings	2100	x1556
2205D	Simons and Beating Peaks data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees	1700	x4873
2205C	Simons and Posting Blogs greedy, greedy, greedy, sortings	1500	x7669
2205B	Simons and Cakes for Success implementation, math, math	800	x16092
2205A	Simons and Making It Beautiful brute force, constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms, constructive algorithms	800	x17208
2204G	Grid Path dp, dp, graphs, matrices	2700	x398
2204F	Sum of Fractions binary search, brute force, combinatorics, data structures, greedy, math, number theory, two pointers	2200	x1217
2204E	Sum of Digits (and Again) brute force, constructive algorithms, math	1800	x4752
2204D	Alternating Path constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, graphs	1400	x8817
2204C	Spring math, math, math, math, math, number theory	1000	x17250
2204B	Right Maximum greedy	800	x19366
2204A	Passing the Ball brute force, implementation	800	x21616
2203F	Binary Search with One Swap binary search, divide and conquer, dp, hashing, math, two pointers	2600	x412
2203E	Probabilistic Card Game binary search, data structures, games, greedy, math, ternary search	2200	x1408
2203D	Divisibility Game brute force, games, games, games, greedy, number theory, number theory	1700	x5395
2203C	Test Generator binary search, bitmasks, greedy, math	1500	x6964
2203B	Beautiful Numbers bitmasks, dp, fft, greedy, math	1000	x14166
2203A	Towers of Boxes math	800	x17880
2202G1	Monotone Monochrome Matrices (Easy Version) data structures, data structures, data structures, data structures	2500	x275
2202B	ABAB Construction dp, greedy, greedy, greedy, implementation	1200	x11071
2202A	Parkour Design math, math, math, math	800	x16262
2201G	Codeforces Heuristic Contest 1001 constructive algorithms	3500	x65
2201F2	Monotone Monochrome Matrices (Hard Version) constructive algorithms, data structures, hashing, math	2800	x397
2201F1	Monotone Monochrome Matrices (Medium Version) data structures, hashing	2900	x269
2201E	ABBA Counting fft, fft, math, number theory, strings	2900	x277
2201D	Binary Not Search and Queries data structures, greedy, implementation	2500	x774
2201C	Rigged Bracket Sequence combinatorics, dp, greedy	2000	x1974
2201B	Recollect Numbers constructive algorithms	1700	x4920
2201A2	Lost Civilization (Hard Version) data structures, dp	1700	x5059
2201A1	Lost Civilization (Easy Version) data structures, data structures	1300	x10993
2200H	Six Seven divide and conquer, math, number theory, strings, strings, trees	2600	x451
2200G	Operation Permutation combinatorics, dp, math, probabilities	2200	x1017
2200F	Mooclear Reactor 2 brute force, data structures, greedy, implementation, sortings	1900	x2865
2200E	Divisive Battle games, greedy, math, number theory	1500	x7993
2200D	Portal greedy, sortings	1300	x11700
2200C	Specialty String brute force, greedy, strings	900	x21599
2200B	Deletion Sort bitmasks, brute force, greedy, sortings	800	x25330
2200A	Eating Game greedy	800	x27929
2199I	Strange Process *special problem	3000	x34
2199H	Sum of MEX *special problem, combinatorics, data structures, dp, math	2300	x90
2199G	Jammer *special problem, math	2500	x58
2199F	Self-Produced Sequences *special problem, combinatorics, math	2000	x147
2199E	Supersequence *special problem, binary search, greedy	2100	x181
2199D	Two Arrays *special problem, math	1800	x275
2199C	Minesweeper *special problem, constructive algorithms, greedy	1600	x406
2199B	Two Towers *special problem, greedy, math	1400	x871
2199A	Game *special problem	1000	x1329
2197B	Array and Permutation implementation, schedules, sortings, two pointers	1100	x15838
2197A	Friendly Numbers binary search, brute force, expression parsing, math, schedules	800	x22804
2196F	Indivisible brute force, constructive algorithms, graphs	3300	x106
2196E2	Fuzzy Concatenation (Hard version) binary search, bitmasks, data structures, dp, greedy, string suffix structures	3000	x198
2196E1	Fuzzy Concatenation (Easy Version) binary search, bitmasks, brute force, data structures, greedy, string suffix structures	2900	x281
2196D	Double Bracket Sequence data structures, dp, expression parsing, flows, greedy, strings	2500	x988
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2506
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x3573
2196B	Another Problem about Beautiful Pairs brute force, math, two pointers	1600	x8536
2196A	Game with a Fraction games, math	1200	x15751
2195H	Codeforces Heuristic Contest 001 brute force, constructive algorithms, geometry, implementation	2400	x459
2195G	Idiot First Search and Queries binary search, data structures, dp, graphs, trees	2300	x1039
2195F	Parabola Independence dp, graphs, greedy, math, sortings	2000	x2688
2195E	Idiot First Search dfs and similar, dp, trees	1500	x8506
2195D	Absolute Cinema math	1300	x13609
2195C	Dice Roll Sequence dp, greedy	1100	x20461
2195B	Heapify 1 implementation, sortings	900	x24763
2195A	Sieve of Erato67henes math, number theory	800	x35329
2194F2	Again Trees... (hard version) bitmasks, data structures, dfs and similar, dp, fft, trees	3000	x167
2194F1	Again Trees... (Easy Version) bitmasks, dfs and similar, dp, trees	2300	x884
2194E	The Turtle Strikes Back dp, graphs, greedy, implementation	2000	x2605
2194D	Table Cut constructive algorithms, greedy, implementation	1600	x7812
2194C	Secret message bitmasks, brute force, dp, math, number theory	1300	x10859
2194B	Offshores greedy, implementation, math	1000	x18350
2194A	Lawn Mower greedy, math	800	x23768
2193H	Remove the Grail Tree dfs and similar, dp, graphs, greedy, implementation, trees	2400	x1042
2193G	Paths in a Tree dfs and similar, interactive, sortings, trees	2100	x2234

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