Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 1, Based on Zhili Cup 2026)
5 days
Register now »

*has extra registration

Before contest
Codeforces Round (Div. 2, Based on Zhili Cup 2026)
5 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
2179E	Blackslex and Girls constructive algorithms, geometry, math	1800	x5768
2179D	Blackslex and Penguin Civilization bitmasks, constructive algorithms, greedy, math	1300	x13483
2179C	Blackslex and Number Theory implementation, math, number theory, sortings	1100	x22271
2179B	Blackslex and Showering dp, greedy, implementation	800	x28310
2179A	Blackslex and Password math, strings	800	x34378
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x219
2178H	Create or Duplicate bitmasks, graphs, number theory, shortest paths	3300	x311
2178G	deCH OR Dations bitmasks, data structures, dp, hashing, probabilities	2800	x593
2178F	Conquer or of Forest combinatorics, math, trees	2200	x1821
2178E	Flatten or Concatenate binary search, divide and conquer, interactive	2000	x3682
2178D	Xmas or Hysteria constructive algorithms, greedy, implementation, math	1700	x6691
2178C	First or Second dp, greedy, implementation	1200	x15667
2178B	Impost or Sus dp, greedy, implementation, strings	900	x21555
2178A	Yes or Yes greedy, strings	800	x25698
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1484
2176E	Remove at the lowest cost data structures, dfs and similar, dp, dsu, greedy, implementation, trees	2400	x1272
2176D	Fibonacci Paths data structures, dp, graphs, sortings	1800	x5753
2176C	Odd Process greedy, sortings	1300	x15691
2176B	Optimal Shifts bitmasks, greedy, strings	1000	x22867
2176A	Operations with Inversions greedy, implementation, math	800	x29024
2175B	XOR Array constructive algorithms, math	1300	x12168
2175A	Little Fairy's Painting implementation	800	x18700
2174F	Mosaic Tree combinatorics, dp, fft, math, trees	2800	x466
2174E2	Game of Scientists (Version 2) binary search, chinese remainder theorem, dfs and similar, interactive, math	3200	x97
2174E1	Game of Scientists (Version 1) chinese remainder theorem, constructive algorithms, interactive, math	3100	x133
2174D	Secret Message data structures, dp, greedy, trees	3400	x292
2174C2	Beautiful Patterns (Hard Version) combinatorics, math, probabilities	2500	x1022
2174C1	Beautiful Patterns (Easy Version) combinatorics, math, probabilities	2400	x1163
2174B	Wishing Cards dp	1900	x3959
2174A	Needle in a Haystack greedy, strings, two pointers	1200	x14265
2173F	Isla's Memory Thresholds binary search, brute force, data structures, divide and conquer, math	2600	x559
2173E	Shiro's Mirror Duel constructive algorithms, greedy, interactive, probabilities, sortings	2200	x1528
2173D	Taiga's Carry Chains bitmasks, brute force, dp, greedy, math	1900	x3630
2173C	Kanade's Perfect Multiples brute force, constructive algorithms, greedy, number theory	1400	x12346
2173B	Niko's Tactical Cards dp, greedy, math	1100	x18092
2173A	Sleeping Through Classes greedy, implementation	800	x23743
2172N	New Kingdom constructive algorithms, graphs, implementation	2800	x163
2172M	Maximum Distance To Port graphs, shortest paths	1300	x5794
2172L	Maximum Color Segment dp, implementation	2300	x800
2172K	Kindergarten Homework implementation, strings	2100	x840
2172J	Sliding Tiles data structures, divide and conquer, dsu	2300	x560
2172I	Birthday geometry	2000	x1075
2172H	Shuffling Cards with Problem Solver 68! hashing, string suffix structures, strings	2500	x302
2172G	Gene Editor	3300	x66
2172F	Cluster Computing System graphs, greedy, math	1600	x3867
2172E	Number Maze implementation	1200	x5881
2172D	Divisor Card Game combinatorics, dp	3100	x102
2172C	Circles Are Far from Each Other binary search, greedy	3100	x95
2172B	Buses greedy, sortings	1800	x2127
2172A	ASCII Art Contest implementation	800	x14487
2171H	Shiori Miyagi and Maximum Array Score binary search, data structures, dp, sortings	2400	x1012
2171G	Sakura Adachi and Optimal Sequences bitmasks, combinatorics, greedy, math	2000	x2316
2171F	Rae Taylor and Trees (hard version) binary search, constructive algorithms, data structures, dp, dsu, greedy, implementation, trees	1600	x7106
2171E	Anisphia Wynn Palettia and Good Permutations constructive algorithms, greedy, number theory	2000	x3637
2171D	Rae Taylor and Trees (easy version) binary search, data structures, dp, dsu, greedy, implementation, trees	1400	x11546
2171C2	Renako Amaori and XOR Game (hard version) bitmasks, games, greedy	1400	x11818
2171C1	Renako Amaori and XOR Game (easy version) bitmasks, games, greedy	1100	x19207
2171B	Yuu Koito and Minimum Absolute Sum math	900	x27053
2171A	Shizuku Hoshikawa and Farm Legs brute force, math	800	x37192
2170F	Build XOR on a Segment bitmasks, dp	2600	x776
2170E	Binary Strings and Blocks combinatorics, data structures, dp	2100	x2314
2170D	Almost Roman constructive algorithms, greedy, implementation	2200	x1678
2170C	Quotient and Remainder binary search, greedy, two pointers	1300	x11219
2170B	Addition on a Segment greedy, math	1200	x14252
2170A	Maximum Neighborhood bitmasks, brute force, greedy, implementation, math	800	x19873
2169F	Subsequence Problem combinatorics, dp, fft, math	2700	x331
2169E	Points Selection dp, greedy	2400	x1040
2169D2	Removal of a Sequence (Hard Version) binary search, divide and conquer, greedy, implementation, math, number theory	2100	x2268
2169D1	Removal of a Sequence (Easy Version) binary search, implementation, math, number theory	1500	x8523
2169C	Range Operation dp, greedy, math, two pointers	1300	x12632
2169B	Drifting Away greedy, implementation	1100	x16082
2169A	Alice and Bob greedy, implementation	900	x19014
2168C	Intercepting Butterflies bitmasks, communication, constructive algorithms, graphs, interactive		x876
2168B	Locate binary search, combinatorics, communication, constructive algorithms, greedy, interactive		x1550
2168A2	Encode and Decode (Hard Version) bitmasks, communication, interactive, math		x3297
2168A1	Encode and Decode (Easy Version) communication, constructive algorithms, interactive		x5019
2167G	Mukhammadali and the Smooth Array data structures, dp	1600	x10998
2167F	Tree, TREE!!! dfs and similar, dp, math, trees	1600	x7115
2167E	khba Loves to Sleep! binary search, data structures, geometry, greedy, implementation	1600	x9044
2167D	Yet Another Array Problem brute force, implementation, math, number theory	1000	x30148
2167C	Isamatdin and His Magic Wand! constructive algorithms, greedy, implementation, sortings	800	x36009
2167B	Your Name sortings, strings	800	x51705
2167A	Square? math, sortings	800	x58285
2166B	Tab Closing math	900	x18084
2166A	Same Difference brute force, greedy, strings	800	x22865
2165F	Arctic Acquisition data structures, greedy	3500	x194
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	x4526
2165A	Cyclic Merging constructive algorithms, greedy	1300	x14073
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	x1575
2164D	Copy String greedy, implementation, strings, two pointers	1800	x4954
2164C	Dungeon binary search, brute force, data structures, greedy, sortings	1400	x10670
2164B	Even Modulo Pair brute force, math, number theory	1000	x18214
2164A	Sequence Game brute force, sortings	800	x20800

The only programming contests Web 2.0 platform

Server time: May/01/2026 16:15:44 (n2).

Desktop version, switch to mobile version.

Supported by