Problemset - Codeforces

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

→ Pay attention

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

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1405B	Array Cancellation constructive algorithms, implementation	1000	x21548
1405A	Permutation Forgery constructive algorithms	800	x21446
1404E	Bricks flows, graph matchings, graphs	2800	x1236
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x1079
1404C	Fixed Point Removal binary search, constructive algorithms, data structures, greedy, two pointers	2300	x2664
1404B	Tree Tag dfs and similar, dp, games, trees	1900	x7397
1404A	Balanced Bitstring implementation, strings	1500	x15426
1403C	Chess Rush *special problem, combinatorics, dp, implementation, math	3200	x51
1403B	Spring cleaning *special problem, data structures, dfs and similar, graphs, trees	2300	x366
1403A	The Potion of Great Power *special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers	2400	x290
1402C	Star Trek *special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees	2600	x203
1402B	Roads *special problem, geometry, sortings	2900	x110
1402A	Fancy Fence *special problem, data structures, dsu, implementation, math, sortings	1800	x1187
1401F	Reverse and Swap binary search, bitmasks, data structures	2400	x1741
1401E	Divide Square data structures, geometry, implementation, sortings	2400	x2424
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x9307
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x24279
1401B	Ternary Sequence constructive algorithms, greedy, math	1100	x21073
1401A	Distance and Axis constructive algorithms, math	900	x27466
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x965
1400F	x-prime Substrings brute force, dfs and similar, dp, string suffix structures, strings	2800	x892
1400E	Clear the Multiset data structures, divide and conquer, dp, greedy	2200	x5434
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x10267
1400C	Binary String Reconstruction 2-sat, brute force, constructive algorithms, greedy	1500	x17321
1400B	RPG Protagonist brute force, greedy, math	1700	x11188
1400A	String Similarity constructive algorithms, strings	800	x27009
1399F	Yet Another Segments Subset data structures, dp, graphs, sortings	2300	x1609
1399E2	Weights Division (hard version) binary search, dfs and similar, greedy, sortings, trees, two pointers	2200	x2281
1399E1	Weights Division (easy version) data structures, dfs and similar, greedy, trees	2000	x5827
1399D	Binary String To Subsequences constructive algorithms, data structures, greedy, implementation	1500	x18270
1399C	Boats Competition brute force, greedy, two pointers	1200	x28850
1399B	Gifts Fixing greedy	800	x43501
1399A	Remove Smallest greedy, sortings	800	x66401
1398G	Running Competition bitmasks, fft, math, number theory	2600	x1103
1398F	Controversial Rounds binary search, data structures, dp, greedy, two pointers	2500	x1281
1398E	Two Types of Spells binary search, data structures, greedy, implementation, math, sortings	2200	x2421
1398D	Colored Rectangles dp, greedy, sortings	1800	x11473
1398C	Good Subarrays data structures, dp, math	1600	x26381
1398B	Substring Removal Game games, greedy, sortings	800	x24604
1398A	Bad Triangle geometry, math	800	x27512
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14698
1397A	Juggling Letters greedy, strings	800	x28576
1396E	Distance Matching constructive algorithms, dfs and similar, trees	3200	x350
1396D	Rainbow Rectangles data structures, sortings, two pointers	3300	x308
1396C	Monster Invaders dp, greedy, implementation	2300	x2591
1396B	Stoned Game brute force, constructive algorithms, games, greedy	1800	x11392
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x15432
1395C	Boboniu and Bit Operations bitmasks, brute force, dp, greedy	1600	x14105
1395B	Boboniu Plays Chess constructive algorithms	1100	x16058
1395A	Boboniu Likes to Color Balls brute force, math	1000	x24103
1394E	Boboniu and Banknote Collection strings	3500	x147
1394D	Boboniu and Jianghu dp, greedy, sortings, trees	2800	x1020
1394C	Boboniu and String binary search, geometry, ternary search	2600	x1089
1394B	Boboniu Walks on Graph brute force, dfs and similar, graphs, hashing	2300	x2010
1394A	Boboniu Chats with Du dp, greedy, sortings, two pointers	1800	x6769
1393E2	Twilight and Ancient Scroll (harder version) dp, hashing, implementation, string suffix structures, strings, two pointers	3200	x368
1393E1	Twilight and Ancient Scroll (easier version) dp, hashing, implementation, string suffix structures, strings	2800	x388
1393D	Rarity and New Dress dfs and similar, dp, implementation, shortest paths	2100	x4000
1393C	Pinkie Pie Eats Patty-cakes constructive algorithms, greedy, math, sortings	1700	x10623
1393B	Applejack and Storages constructive algorithms, data structures, greedy, implementation	1400	x16695
1393A	Rainbow Dash, Fluttershy and Chess Coloring greedy, math	800	x20507
1392I	Kevin and Grid fft, graphs, math	3300	x204
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x720
1392G	Omkar and Pies bitmasks, dfs and similar, dp, math, shortest paths	2900	x486
1392F	Omkar and Landslide binary search, constructive algorithms, data structures, greedy, math	2400	x2149
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3531
1392D	Omkar and Bed Wars dp, greedy	1700	x8937
1392C	Omkar and Waterslide greedy, implementation	1200	x18784
1392B	Omkar and Infinity Clock implementation, math	800	x18479
1392A	Omkar and Password greedy, math	800	x20597
1391E	Pairs of Pairs constructive algorithms, dfs and similar, graphs, greedy, trees	2600	x1712
1391D	505 bitmasks, brute force, constructive algorithms, dp, greedy, implementation	2000	x5274
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x15013
1391B	Fix You brute force, greedy, implementation	800	x27231
1391A	Suborrays constructive algorithms, math	800	x24370
1389G	Directing Edges dfs and similar, dp, graphs, trees	2800	x395
1389F	Bicolored Segments data structures, dp, graph matchings, sortings	2600	x980
1389E	Calendar Ambiguity math, number theory	2200	x3445
1389D	Segment Intersections brute force, greedy, implementation, math	2100	x4310
1389C	Good String brute force, dp, greedy, two pointers	1500	x19015
1389B	Array Walk brute force, dp, greedy	1600	x16756
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x41241
1388E	Uncle Bogdan and Projections data structures, geometry, sortings	2700	x591
1388D	Captain Flint and Treasure data structures, dfs and similar, graphs, greedy, implementation, trees	2000	x6424
1388C	Uncle Bogdan and Country Happiness dfs and similar, greedy, math, trees	1800	x9716
1388B	Captain Flint and a Long Voyage greedy, math	1000	x22278
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x24912
1387C	Viruses *special problem, dp, shortest paths, string suffix structures	2900	x130
1387B2	Village (Maximum) *special problem, dfs and similar, trees	2500	x903
1387B1	Village (Minimum) *special problem, dp, greedy, trees	2100	x1446
1387A	Graph *special problem, binary search, dfs and similar, dp, math, ternary search	2100	x712
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x520
1386B	Mixture *special problem, data structures, geometry, math, sortings	2900	x121
1386A	Colors *special problem, binary search, constructive algorithms, interactive	2700	x263
1385G	Columns Swaps 2-sat, dfs and similar, dsu, graphs, implementation	2300	x1556
1385F	Removing Leaves data structures, greedy, implementation, trees	2300	x2535
1385E	Directing Edges constructive algorithms, dfs and similar, graphs	2000	x7437
1385D	a-Good String bitmasks, brute force, divide and conquer, dp, implementation	1500	x19293
1385C	Make It Good greedy	1200	x26976
1385B	Restore the Permutation by Merger greedy	800	x37144