Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
4 days
Register now »

*has extra registration

Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1278A	Shuffle Hashing brute force, implementation, strings	1000	x18288
1277D	Let's Play the Words? data structures, hashing, implementation, math	1900	x3275
1277B	Make Them Odd greedy, number theory	1200	x17033
1277A	Happy Birthday, Polycarp! implementation	1000	x14483
1276F	Asterisk Substrings string suffix structures	3400	x447
1276E	Four Stones constructive algorithms	3500	x123
1276D	Tree Elimination dp, trees	2900	x671
1276C	Beautiful Rectangle brute force, combinatorics, constructive algorithms, data structures, greedy, math	2300	x1788
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x5668
1276A	As Simple as One and Two dp, greedy	1400	x12947
1275F	Шардирование постов *special problem, binary search, interactive		x92
1275E3	Контрольная сумма *special problem		x61
1275E2	Контрольная сумма *special problem		x138
1275E1	Контрольная сумма *special problem		x265
1275D	Storage2 *special problem		x422
1275C	#define Задача B ... *special problem		x698
1275B	Code Review *special problem		x844
1275A	Скрытый друг *special problem		x891
1272F	Two Bracket Sequences dp, strings, two pointers	2200	x2330
1272E	Nearest Opposite Parity dfs and similar, graphs, shortest paths	1900	x7918
1272D	Remove One Element brute force, dp	1500	x19280
1272C	Yet Another Broken Keyboard combinatorics, dp, implementation	1200	x30717
1272B	Snow Walking Robot constructive algorithms, greedy, implementation	1200	x14680
1272A	Three Friends brute force, greedy, math, sortings	900	x22071
1271F	Divide The Students brute force	2700	x260
1271E	Common Number binary search, combinatorics, dp, math	2100	x3712
1271D	Portals data structures, dp, greedy, implementation, sortings	2100	x3402
1271C	Shawarma Tent brute force, geometry, greedy, implementation	1300	x11120
1271B	Blocks greedy, math	1300	x12095
1271A	Suits brute force, greedy, math	800	x15671
1270I	Xor on Figures constructive algorithms, fft, math	3500	x317
1270H	Number of Components data structures	3300	x1005
1270G	Subset with Zero Sum constructive algorithms, dfs and similar, graphs, math	2700	x2956
1270F	Awesome Substrings math, strings	2600	x1336
1270E	Divide Points constructive algorithms, geometry, math	2300	x2746
1270D	Strange Device constructive algorithms, interactive, math, sortings	1900	x4868
1270C	Make Good bitmasks, constructive algorithms, math	1400	x15036
1270B	Interesting Subarray constructive algorithms, greedy, math	1200	x17357
1270A	Card Game games, greedy, math	800	x17812
1269B	Modulo Equality brute force, sortings	1500	x9615
1269A	Equation brute force, math	800	x24091
1268E	Happy Cactus dp	3400	x295
1268D	Invertation in Tournament brute force, divide and conquer, graphs, math	3200	x639
1268C	K Integers binary search, data structures	2300	x1953
1268B	Domino for Young dp, greedy, math	2000	x6430
1268A	Long Beautiful Integer constructive algorithms, greedy, implementation, strings	1700	x9069
1267L	Lexicography constructive algorithms, strings	1800	x3357
1267K	Key Storage combinatorics, math	2100	x2142
1267J	Just Arrange the Icons greedy, implementation, math	1800	x3056
1267I	Intriguing Selection brute force, constructive algorithms, implementation, interactive, sortings	2600	x1068
1267H	Help BerLine constructive algorithms	3200	x229
1267G	Game Relics math, probabilities	3000	x825
1267F	Foolprüf Security graphs	2600	x720
1267E	Elections greedy	1700	x3504
1267D	DevOps Best Practices constructive algorithms	2800	x261
1267C	Cactus Revenge constructive algorithms	3500	x391
1267B	Balls of Buma	900	x4538
1267A	Apprentice Learning Trajectory	2400	x1061
1266H	Red-Blue Graph dp, graphs, math, matrices, meet-in-the-middle	3400	x132
1266G	Permutation Concatenation string suffix structures	3300	x139
1266F	Almost Same Distance dfs and similar, graphs	2900	x377
1266E	Spaceship Solitaire data structures, greedy, implementation	2100	x2348
1266D	Decreasing Debts constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers	2000	x3870
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x10067
1266B	Dice Tower constructive algorithms, math	1000	x16573
1266A	Competitive Programmer chinese remainder theorem, math	1000	x17502
1265E	Beautiful Mirrors data structures, dp, math, probabilities	2100	x4514
1265B	Beautiful Numbers data structures, implementation, math, two pointers	1300	x13523
1265A	Beautiful String constructive algorithms, greedy	1000	x15946
1264F	Beautiful Fibonacci Problem constructive algorithms, number theory	3500	x1097
1264E	Beautiful League constructive algorithms, flows, graph matchings	2700	x928
1264D2	Beautiful Bracket Sequence (hard version) combinatorics, probabilities	2900	x1315
1264D1	Beautiful Bracket Sequence (easy version) combinatorics, dp, probabilities	2600	x1525
1264C	Beautiful Mirrors with queries data structures, probabilities	2400	x1322
1264B	Beautiful Sequence brute force, constructive algorithms, greedy	1900	x6046
1264A	Beautiful Regional Contest greedy, implementation	1500	x10440
1263F	Economic Difficulties data structures, dfs and similar, dp, flows, graphs, trees	2400	x951
1263E	Editor data structures, implementation	2100	x2973
1263D	Secret Passwords dfs and similar, dsu, graphs	1500	x15997
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x14661
1263B	PIN Codes greedy, implementation	1400	x11810
1263A	Sweet Problem math	1100	x17221
1261F	Xor-Set bitmasks, divide and conquer, math	3100	x442
1260F	Colored Tree data structures, trees	2700	x631
1260E	Tournament brute force, dp, greedy	2400	x1890
1260D	A Game with Traps binary search, dp, greedy, sortings	1900	x4188
1260C	Infinite Fence greedy, math, number theory	1700	x8780
1260B	Obtain Two Zeroes binary search, math	1300	x16710
1260A	Heating math	1000	x15814
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x734
1257F	Make Them Similar bitmasks, brute force, hashing, meet-in-the-middle	2400	x2312
1257E	The Contest data structures, dp, greedy	2000	x4534
1257D	Yet Another Monster Killing Problem binary search, data structures, dp, greedy, sortings, two pointers	1700	x8171
1257C	Dominated Subarray greedy, implementation, sortings, strings, two pointers	1200	x17142
1257B	Magic Stick math	1000	x22518
1257A	Two Rival Students greedy, math	800	x21660
1256F	Equalizing Two Strings constructive algorithms, sortings, strings	2000	x3621
1256E	Yet Another Division Into Teams dp, greedy, sortings	2000	x4598
1256D	Binary String Minimizing greedy	1500	x12746
1256C	Platforms Jumping greedy	1700	x7320

The only programming contests Web 2.0 platform

Server time: May/02/2026 15:36:36 (g2).

Desktop version, switch to mobile version.

Supported by