Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 1 + Div. 2)
2 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1557D	Ezzat and Grid data structures, dp, greedy	2200	x2483
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8348
1557B	Moamen and k-subarrays greedy, sortings	1100	x22874
1557A	Ezzat and Two Subsequences brute force, math, sortings	800	x27503
1556H	DIY Tree graphs, greedy, math, probabilities	3300	x323
1556G	Gates to Another World bitmasks, data structures, dsu, two pointers	3300	x309
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1179
1556E	Equilibrium data structures, dp, greedy	2200	x2515
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x6519
1556C	Compressed Bracket Sequence brute force, implementation	1800	x5661
1556B	Take Your Places! implementation	1300	x12441
1556A	A Variety of Operations math	800	x17914
1555F	Good Graph data structures, dsu, graphs, trees	2700	x830
1555E	Boring Segments data structures, sortings, trees, two pointers	2100	x3870
1555D	Say No to Palindromes brute force, constructive algorithms, dp, strings	1600	x11794
1555C	Coin Rows brute force, constructive algorithms, dp, implementation	1300	x20948
1555B	Two Tables brute force	1300	x15654
1555A	PizzaForces brute force, math	900	x27352
1554E	You dfs and similar, dp, math, number theory	2600	x1183
1554D	Diane constructive algorithms, greedy, strings	1800	x9107
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x8555
1554B	Cobb bitmasks, brute force, greedy, math	1700	x12461
1554A	Cherry greedy	800	x28638
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x196
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x675
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x979
1553F	Pairwise Modulo data structures, math	2300	x2108
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3245
1553D	Backspace dp, greedy, strings, two pointers	1500	x13365
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x17356
1553B	Reverse String brute force, dp, hashing, implementation, strings	1300	x13854
1553A	Digits Sum math, number theory	800	x30219
1552I	Organizing a Music Festival dfs and similar, math	3400	x121
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x316
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x454
1552F	Telepanting binary search, data structures, dp, sortings	2200	x2792
1552E	Colors and Intervals constructive algorithms, data structures, greedy, sortings	2300	x1774
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x6714
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5779
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x15003
1552A	Subsequence Permutation sortings, strings	800	x23535
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x1752
1551E	Fixed Points binary search, brute force, dp	2000	x3696
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2666
1551D1	Domino (easy version) constructive algorithms, math	1700	x6864
1551C	Interesting Story greedy, sortings, strings	1500	x12915
1551B2	Wonderful Coloring - 2 binary search, constructive algorithms, data structures, greedy	1400	x15086
1551B1	Wonderful Coloring - 1 greedy, strings	800	x28699
1551A	Polycarp and Coins greedy, math	800	x48641
1550F	Jumping Around binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths	2700	x631
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1442
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1788
1550C	Manhattan Subarrays brute force, geometry, greedy, implementation	1700	x9956
1550B	Maximum Cost Deletion greedy, math	1000	x25798
1550A	Find The Array greedy, math	800	x27694
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x23842
1549A	Gregor and Cryptography math, number theory	800	x31457
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x339
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x238
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1429
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1738
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9333
1548A	Web of Lies brute force, graphs, greedy	1400	x16056
1547G	How Many Paths? dfs and similar, dp, graphs, trees	2100	x2870
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5524
1547E	Air Conditioners data structures, dp, implementation, shortest paths, sortings, two pointers	1500	x13891
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x16098
1547C	Pair Programming greedy, two pointers	1100	x22055
1547B	Alphabetical Strings greedy, implementation, strings	800	x26002
1547A	Shortest Path with Obstacle implementation, math	800	x29934
1546B	AquaMoon and Stolen String interactive, math	1200	x12870
1546A	AquaMoon and Two Arrays brute force, greedy	800	x18097
1545F	AquaMoon and Potatoes brute force, data structures, dp	3500	x105
1545E2	AquaMoon and Time Stop (hard version) data structures, dp	3500	x79
1545E1	AquaMoon and Time Stop (easy version) data structures, dp	3500	x74
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x464
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x586
1545B	AquaMoon and Chess combinatorics, math	1900	x5659
1545A	AquaMoon and Strange Sort sortings	1500	x13606
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x395
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x1948
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x7455
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5190
1543B	Customising the Track combinatorics, greedy, math	900	x22694
1543A	Exciting Bets greedy, math, number theory	900	x26553
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x812
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1188
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2535
1542C	Strange Function math, number theory	1600	x13572
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x22153
1542A	Odd Set math	800	x42501
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x26656
1541A	Pretty Permutations constructive algorithms, greedy, implementation	800	x29018
1540E	Tasty Dishes math, matrices	3500	x99
1540D	Inverse Inversions binary search, brute force, data structures	3200	x264
1540C2	Converging Array (Hard Version) dp, math	2900	x439
1540C1	Converging Array (Easy Version) dp, math	2700	x597
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2497
1540A	Great Graphs constructive algorithms, graphs, greedy, shortest paths, sortings	1400	x13704
1539F	Strange Array data structures, greedy, sortings	2600	x837