Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

Before contest
Codeforces Round (Div. 2)
7 days

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
553A	Kyoya and Colored Balls combinatorics, dp, math	1500	x8649
552D	Vanya and Triangles brute force, combinatorics, data structures, geometry, math, sortings	1900	x4482
552C	Vanya and Scales brute force, dp, greedy, math, meet-in-the-middle, number theory	1900	x5474
551B	ZgukistringZ brute force, constructive algorithms, implementation, strings	1800	x3858
550D	Regular Bridge constructive algorithms, graphs, implementation	1900	x3340
550C	Divisibility by Eight brute force, dp, math	1500	x28584
550B	Preparing Olympiad bitmasks, brute force	1400	x21070
550A	Two Substrings brute force, dp, greedy, implementation, strings	1500	x37891
549D	Haar Features greedy, implementation	1900	x2141
548B	Mike and Fun brute force, dp, greedy, implementation	1400	x8424
547B	Mike and Feet binary search, data structures, dp, dsu	1900	x8654
546D	Soldier and Number Game constructive algorithms, dp, math, number theory	1700	x11778
546C	Soldier and Cards brute force, dfs and similar, games	1400	x17543
545D	Queue greedy, implementation, sortings	1300	x25061
545C	Woodcutters dp, greedy	1500	x27752
544B	Sea and Islands constructive algorithms, implementation	1400	x8006
543A	Writing Code dp	1800	x7951
540D	Bad Luck Island dp, probabilities	1900	x5461
540B	School Marks greedy, implementation	1700	x4702
538D	Weird Chess brute force, constructive algorithms, implementation	1800	x2427
538C	Tourist's Notes binary search, brute force, greedy, implementation, math	1600	x5810
538B	Quasi Binary constructive algorithms, dp, greedy, implementation	1400	x18021
538A	Cutting Banner brute force, implementation	1400	x7134
535D	Tavas and Malekas greedy, hashing, string suffix structures, strings	1900	x3951
535C	Tavas and Karafs binary search, greedy, math	1900	x3779
534D	Handshakes binary search, constructive algorithms, data structures, greedy	1900	x2406
534C	Polycarpus' Dice math	1600	x5012
534B	Covered Path dp, greedy, math	1400	x10245
533E	Correcting Mistakes constructive algorithms, dp, greedy, hashing, strings, two pointers	1800	x2258
533C	Board Game games, greedy, implementation, math	1700	x2193
530E	Sum and product *special problem	1700	x307
530D	Set subtraction *special problem	1600	x452
530C	Diophantine equation *special problem	1500	x555
530B	String inside out *special problem	1600	x542
530A	Quadratic equation *special problem	1500	x673
529B	Group Photo 2 (online mirror version) brute force, greedy, sortings	1900	x871
527D	Clique Problem data structures, dp, greedy, implementation, sortings	1800	x4771
527C	Glass Carving binary search, data structures, implementation	1500	x6894
527B	Error Correct System greedy	1500	x3879
526B	Om Nom and Dark Park dfs and similar, greedy, implementation	1400	x4496
526A	King of Thieves brute force, implementation	1300	x4763
525C	Ilya and Sticks greedy, math, sortings	1600	x5809
525B	Pasha and String constructive algorithms, greedy, math, strings	1400	x9369
524C	The Art of Dealing with ATM binary search, sortings	1900	x2048
524B	Фото на память - 2 (round version) dp, greedy	1700	x1459
524A	Возможно, вы знаете этих людей? implementation	1600	x1412
523D	Statistics of Recompressing Videos *special problem, data structures, implementation	1600	x2330
523C	Name Quest *special problem, greedy	1400	x2496
523B	Mean Requests *special problem, implementation	1500	x952
520C	DNA Alignment math, strings	1500	x4147
520B	Two Buttons dfs and similar, graphs, greedy, implementation, math, shortest paths	1400	x50872
519D	A and B and Interesting Substrings data structures, dp, two pointers	1800	x6369
519C	A and B and Team Training greedy, implementation, math, number theory	1300	x19711
518D	Ilya and Escalator combinatorics, dp, math, probabilities	1700	x6970
518C	Anya and Smartphone constructive algorithms, data structures, implementation	1600	x5997
518B	Tanya and Postcard greedy, implementation, strings	1400	x7960
518A	Vitaly and Strings constructive algorithms, strings	1600	x9216
515C	Drazil and Factorial greedy, math, sortings	1400	x25925
515B	Drazil and His Happy Friends brute force, dsu, meet-in-the-middle, number theory	1300	x7447
514B	Han Solo and Lazer Gun brute force, data structures, geometry, implementation, math	1400	x20787
513G1	Inversions problem brute force, dfs and similar, dp, meet-in-the-middle	1800	x1785
513B2	Permutations bitmasks, divide and conquer, math	1800	x2631
513B1	Permutations brute force	1400	x3623
510D	Fox And Jumping bitmasks, brute force, dp, math	1900	x5481
510C	Fox And Names dfs and similar, graphs, sortings	1600	x16229
510B	Fox And Two Dots dfs and similar	1500	x13979
509B	Painting Pebbles constructive algorithms, greedy, implementation	1300	x9623
508C	Anya and Ghosts constructive algorithms, greedy	1600	x4462
508B	Anton and currency you all know greedy, math, strings	1300	x22595
507C	Guess Your Way Out! implementation, math, trees	1700	x4330
507B	Amr and Pins geometry, math	1400	x24524
505C	Mr. Kitayuta, the Treasure Hunter dfs and similar, dp, two pointers	1900	x6358
505B	Mr. Kitayuta's Colorful Graph dfs and similar, dp, dsu, graphs	1400	x12965
501C	Misha and Forest constructive algorithms, data structures, greedy, sortings, trees	1500	x5648
500D	New Year Santa Network combinatorics, dfs and similar, graphs, trees	1900	x3117
500C	New Year Book Reading constructive algorithms, greedy, implementation, math	1600	x5807
500B	New Year Permutation dfs and similar, dsu, graphs, greedy, math, sortings	1600	x8875
498A	Crazy Town geometry	1700	x6447
496D	Tennis Game binary search	1900	x3016
496C	Removing Columns brute force, constructive algorithms, implementation	1500	x7739
496B	Secret Combination brute force, constructive algorithms, implementation	1500	x5880
495B	Modular Equations math, number theory	1600	x6926
494A	Treasure greedy	1500	x6228
493D	Vasya and Chess constructive algorithms, games, math	1700	x9668
493C	Vasya and Basketball binary search, brute force, data structures, implementation, sortings, two pointers	1600	x6794
493B	Vasya and Wrestling implementation	1400	x13317
493A	Vasya and Football implementation	1300	x6109
492D	Vanya and Computer Game binary search, implementation, math, sortings	1800	x3154
492C	Vanya and Exams greedy, sortings	1400	x14045
490D	Chocolate brute force, dfs and similar, math, meet-in-the-middle, number theory	1900	x2139
490C	Hacking Cypher brute force, math, number theory, strings	1700	x9077
490B	Queue dsu, implementation	1500	x5990
489D	Unbearable Controversy of Being brute force, combinatorics, dfs and similar, graphs	1700	x6675
489C	Given Length and Sum of Digits... dp, greedy, implementation	1400	x46137
488B	Candy Boxes brute force, constructive algorithms, math	1900	x2120
487A	Fight the Monster binary search, brute force, implementation	1800	x3721
486C	Palindrome Transformation brute force, greedy, implementation	1700	x11740
486B	OR in Matrix greedy, hashing, implementation	1300	x17589
485B	Valuable Resources brute force, greedy	1300	x6527
485A	Factory implementation, math, matrices	1400	x8263