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
1665E	MinimizOR bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers	2500	x1518
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3958
1665C	Tree Infection binary search, greedy, sortings, trees	1600	x8368
1665B	Array Cloning Technique constructive algorithms, greedy, sortings	900	x20411
1665A	GCD vs LCM constructive algorithms, math	800	x23601
1661F	Teleporters binary search, greedy	2600	x586
1661E	Narrow Components brute force, data structures, dp, dsu, math, trees	2500	x950
1661D	Progressions Covering data structures, greedy	1900	x4740
1661C	Water the Trees binary search, greedy, math	1700	x9327
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17728
1661A	Array Balancing greedy, math	800	x18364
1660F2	Promising String (hard version) data structures, implementation, math, strings	2100	x2717
1660F1	Promising String (easy version) brute force, implementation, math, strings	1700	x7272
1660E	Matrix and Shifts brute force, constructive algorithms, greedy, implementation	1600	x7306
1660D	Maximum Product Strikes Back brute force, implementation, math, two pointers	1600	x8661
1660C	Get an Even String dp, greedy, strings	1300	x19563
1660B	Vlad and Candies math	800	x28080
1660A	Vasya and Coins greedy, math	800	x35962
1659F	Tree and Permutation Game dfs and similar, games, graphs, trees	3000	x191
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1570
1659D	Reverse Sort Sum constructive algorithms, data structures, greedy, implementation, math, two pointers	1900	x4008
1659C	Line Empire binary search, brute force, dp, greedy, implementation, math	1500	x10496
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10931
1659A	Red Versus Blue constructive algorithms, greedy, implementation, math	1000	x18741
1658F	Juju and Binary String brute force, constructive algorithms, greedy, math	2700	x769
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1047
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2540
1658D1	388535 (Easy Version) bitmasks, math	1600	x9073
1658C	Shinju and the Lost Permutation constructive algorithms, math	1700	x9323
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18593
1658A	Marin and Photoshoot constructive algorithms, implementation, math	800	x20317
1657F	Words on Tree 2-sat, dfs and similar, dsu, graphs, trees	2600	x577
1657E	Star MST combinatorics, dp, graph matchings, math	2200	x2093
1657D	For Gamers. By Gamers. binary search, brute force, greedy, math, sortings	2000	x4861
1657C	Bracket Sequence Deletion greedy, implementation	1200	x16816
1657B	XY Sequence greedy	800	x22799
1657A	Integer Moves brute force, math	800	x23970
1656I	Neighbour Ordering constructive algorithms, graphs	3500	x104
1656H	Equal LCM Subsets data structures, math, number theory	3200	x575
1656G	Cycle Palindrome constructive algorithms, graphs, math	3200	x385
1656F	Parametric MST binary search, constructive algorithms, graphs, greedy, math, sortings	2600	x1036
1656E	Equal Tree Sums constructive algorithms, dfs and similar, math, trees	2200	x3445
1656D	K-good constructive algorithms, math, number theory	1900	x6867
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x19161
1656B	Subtract Operation data structures, greedy, math, two pointers	1100	x18891
1656A	Good Pairs math, sortings	800	x19585
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x76
1654G	Snowy Mountain data structures, dfs and similar, graphs, greedy, shortest paths, trees	2900	x394
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1199
1654E	Arithmetic Operations brute force, data structures, graphs, math	2300	x2090
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2845
1654C	Alice and the Cake data structures, greedy, implementation, sortings	1400	x13486
1654B	Prefix Removals strings	800	x15623
1654A	Maximum Cake Tastiness brute force, greedy, implementation, sortings	800	x18654
1651F	Tower Defense binary search, brute force, data structures	3000	x380
1651E	Sum of Matchings brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math	2600	x519
1651D	Nearest Excluded Points binary search, data structures, dfs and similar, graphs, shortest paths	1900	x5125
1651C	Fault-tolerant Network brute force, data structures, implementation	1500	x10707
1651B	Prove Him Wrong constructive algorithms, greedy	800	x19570
1651A	Playoff implementation	800	x25668
1650G	Counting Shortcuts data structures, dfs and similar, dp, graphs, shortest paths	2100	x2483
1650F	Vitaly and Advanced Useless Algorithms dp, greedy, implementation	2200	x1455
1650E	Rescheduling the Exam binary search, data structures, greedy, implementation, math, sortings	1900	x4143
1650D	Twist the Permutation brute force, constructive algorithms, implementation, math	1300	x13029
1650C	Weight of the System of Nested Segments greedy, hashing, implementation, sortings	1200	x16740
1650B	DIV + MOD math	900	x27660
1650A	Deletions of Two Adjacent Letters implementation, strings	800	x34704
1649B	Game of Ball Passing greedy, implementation	1300	x13030
1649A	Game implementation	800	x15531
1648F	Two Avenues data structures, dfs and similar, graphs	3500	x134
1648E	Air Reform data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees	3200	x402
1648D	Serious Business data structures, divide and conquer, dp, implementation, shortest paths	2800	x882
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x2984
1648B	Integral Array brute force, constructive algorithms, data structures, math	1800	x6438
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x12837
1647F	Madoka and Laziness dp, greedy	3100	x455
1647E	Madoka and the Sixth-graders data structures, dfs and similar, greedy	2500	x992
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5281
1647C	Madoka and Childish Pranks constructive algorithms, greedy	1300	x12594
1647B	Madoka and the Elegant Gift brute force, constructive algorithms, graphs, implementation	1200	x15390
1647A	Madoka and Math Dad implementation, math	800	x22759
1646F	Playing Around the Table constructive algorithms, greedy, implementation	2900	x525
1646E	Power Board brute force, dp, math, number theory	2200	x2436
1646D	Weight the Tree constructive algorithms, dfs and similar, dp, implementation, trees	2000	x3744
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x14127
1646B	Quality vs Quantity brute force, constructive algorithms, greedy, sortings, two pointers	800	x21154
1646A	Square Counting math	800	x24284
1644F	Basis combinatorics, fft, math, number theory	2900	x326
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3099
1644D	Cross Coloring data structures, implementation, math	1700	x7236
1644C	Increase Subarray Sums brute force, dp, greedy, implementation	1400	x13772
1644B	Anti-Fibonacci Permutation brute force, constructive algorithms, implementation	800	x20673
1644A	Doors and Keys implementation	800	x27345
1642B	Power Walking greedy	900	x16933
1642A	Hard Way geometry	800	x16202
1641F	Covering Circle geometry	3500	x99
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x208
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1161
1641C	Anonymity Is Important binary search, brute force, data structures, dsu, greedy, sortings	2200	x2427
1641B	Repetitions Decoding constructive algorithms, implementation, sortings	2000	x3813