Problemset - Codeforces

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

→ Pay attention

Before contest
Kotlin Heroes: Episode 11
8 days
Register now »

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
290E	HQ *special problem, constructive algorithms	2500	x200
290D	Orange *special problem, implementation	1400	x1797
290C	WTF? *special problem, graph matchings, implementation, trees	1700	x1537
290B	QR code *special problem, implementation	1500	x2430
290A	Mysterious strings *special problem, implementation	1400	x2989
289B	Polo the Penguin and Matrix brute force, dp, implementation, sortings, ternary search	1400	x17222
289A	Polo the Penguin and Segments brute force, implementation	1100	x9177
288E	Polo the Penguin and Lucky Numbers dp, implementation, math	2800	x289
288D	Polo the Penguin and Trees combinatorics, dfs and similar, trees	2400	x751
288C	Polo the Penguin and XOR operation implementation, math	1700	x2284
288B	Polo the Penguin and Houses combinatorics	1500	x2905
288A	Polo the Penguin and Strings greedy	1300	x6482
287B	Pipeline binary search, math	1700	x9619
287A	IQ Test brute force, implementation	1100	x19675
286E	Ladies' Shop constructive algorithms, fft, math	2800	x832
286D	Tourists data structures, sortings	2600	x378
286C	Main Sequence greedy, implementation	2100	x1503
286B	Shifting implementation	2200	x1112
286A	Lucky Permutation constructive algorithms, math	1400	x3156
285E	Positions in Permutations combinatorics, dp, math	2600	x984
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1543
285C	Building Permutation greedy, implementation, sortings	1200	x23156
285B	Find Marble implementation	1200	x14988
285A	Slightly Decreasing Permutations greedy, implementation	1100	x13319
284B	Cows and Poker Game brute force, implementation	1000	x6768
284A	Cows and Primitive Roots implementation, math, number theory	1400	x6555
283E	Cow Tennis Tournament combinatorics, data structures, math	2800	x768
283D	Cows and Cool Sequences dp, math, number theory	2400	x531
283C	Coin Troubles dp	2100	x1433
283B	Cow Program dfs and similar, dp, graphs	1700	x3654
283A	Cows and Sequence constructive algorithms, data structures, implementation	1600	x6553
282E	Sausage Maximization bitmasks, data structures, trees	2200	x3575
282D	Yet Another Number Game dp, games	2100	x1423
282C	XOR and OR constructive algorithms, implementation, math	1500	x9371
282B	Painting Eggs greedy, math	1500	x12912
282A	Bit++ implementation	800	x257214
281B	Nearest Fraction brute force, implementation, two pointers	1700	x3026
281A	Word Capitalization implementation, strings	800	x208991
280E	Sequence Transformation brute force, data structures, dp, implementation, math	3000	x205
280D	k-Maximum Subsequence Sum data structures, flows, graphs, implementation	2800	x1277
280C	Game on Tree implementation, math, probabilities, trees	2200	x3954
280B	Maximum Xor Secondary data structures, implementation, two pointers	1800	x4527
280A	Rectangle Puzzle geometry	2000	x1463
279E	Beautiful Decomposition dp, games, greedy, number theory	1900	x1437
279D	The Minimum Number of Variables bitmasks, dp	2200	x725
279C	Ladder dp, implementation, two pointers	1700	x8221
279B	Books binary search, brute force, implementation, two pointers	1400	x52106
279A	Point on Spiral brute force, geometry, implementation	1400	x5581
278B	New Problem brute force, strings	1500	x3449
278A	Circle Line implementation	800	x11633
277E	Binary Tree on Plane flows, trees	2400	x1278
277D	Google Code Jam dp, probabilities	2800	x336
277C	Game games, implementation	2400	x449
277B	Set of Points constructive algorithms, geometry	2300	x803
277A	Learning Languages dfs and similar, dsu	1400	x18788
276E	Little Girl and Problem on Trees data structures, graphs, trees	2100	x1597
276D	Little Girl and Maximum XOR bitmasks, dp, greedy, implementation, math	1700	x13705
276C	Little Girl and Maximum Sum data structures, greedy, implementation, sortings	1500	x26118
276B	Little Girl and Game games, greedy	1300	x28389
276A	Lunch Rush implementation	900	x27529
275B	Convex Shape constructive algorithms, implementation	1700	x2820
275A	Lights Out implementation	900	x29922
274E	Mirror Room data structures, implementation	3000	x313
274D	Lovely Matrix dfs and similar, graphs, greedy, sortings	2200	x1029
274C	The Last Hole! brute force, geometry	2600	x350
274B	Zero Tree dfs and similar, dp, greedy, trees	1800	x4997
274A	k-Multiple Free Set binary search, greedy, sortings	1500	x10020
273E	Dima and Game dp, games	2600	x366
273D	Dima and Figure dp	2400	x412
272E	Dima and Horses combinatorics, constructive algorithms, graphs	2200	x1218
272D	Dima and Two Sequences combinatorics, math, sortings	1600	x2615
272C	Dima and Staircase data structures, implementation	1500	x6773
272B	Dima and Sequence implementation, math	1400	x4014
272A	Dima and Friends implementation, math	1000	x24409
271E	Three Horses constructive algorithms, math, number theory	2200	x486
271D	Good Substrings data structures, strings	1800	x11152
271C	Secret constructive algorithms, implementation	1500	x2938
271B	Prime Matrix binary search, brute force, math, number theory	1300	x12950
271A	Beautiful Year brute force	800	x136315
270B	Multithreading data structures, greedy, implementation	1400	x4125
270A	Fancy Fence geometry, implementation, math	1100	x45110
269E	String Theory geometry, math, strings	3100	x108
269D	Maximum Waterfall data structures, dp, graphs, sortings	2600	x449
269C	Flawed Flow constructive algorithms, flows, graphs, greedy	2100	x1673
269B	Greenhouse Effect dp	1700	x6282
269A	Magical Boxes greedy, math	1600	x3518
268E	Playlist math, probabilities, sortings	2100	x986
268D	Wall Bars dp	2300	x508
268C	Beautiful Sets of Points constructive algorithms, implementation	1500	x13612
268B	Buttons implementation, math	1000	x32182
268A	Games brute force	800	x85641
267C	Berland Traffic math, matrices	2700	x161
267B	Dominoes dfs and similar, graphs	2000	x632
267A	Subtractions math, number theory	900	x7438
266E	More Queries to Array... data structures, math	2500	x919
266D	BerDonalds graphs, math, shortest paths	2400	x890
266C	Below the Diagonal constructive algorithms, greedy, math	2100	x1347
266B	Queue at the School constructive algorithms, graph matchings, implementation, shortest paths	800	x133842
266A	Stones on the Table implementation	800	x188766
265B	Roadside Trees (Simplified Edition) greedy, implementation	1000	x17185