Problemset - Codeforces

Codeforces and Polygon may be unavailable from December 6, 19:00 (UTC) to December 6, 21:00 (UTC) due to technical maintenance. ×

→ Pay attention

Before contest
Codeforces Round 991 (Div. 3)
12:26:01
Register now »

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1556C	Compressed Bracket Sequence brute force, implementation	1800	x5827
1554D	Diane constructive algorithms, greedy, strings	1800	x9571
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x8994
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7102
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5953
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x10021
1535D	Playoff Tournament data structures, dfs and similar, dp, implementation, trees	1800	x7812
1534D	Lost Tree constructive algorithms, interactive, trees	1800	x6117
1525D	Armchairs dp, flows, graph matchings, greedy	1800	x9883
1517D	Explorer Space dp, graphs, shortest paths	1800	x7806
1509C	The Sports Festival dp, greedy	1800	x12786
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x4041
1505E	Cakewalk *special problem, greedy, implementation, shortest paths	1800	x1809
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x802
1500A	Going Home brute force, hashing, implementation, math	1800	x8933
1491D	Zookeeper and The Infinite Zoo bitmasks, constructive algorithms, dp, greedy, math	1800	x7242
1488B	RBS Deletion *special problem, greedy	1800	x568
1477A	Nezzar and Board constructive algorithms, math, number theory	1800	x6016
1475D	Cleaning the Phone binary search, dp, sortings, two pointers	1800	x10268
1468J	Road Reform dsu, graphs, greedy	1800	x4432
1466E	Apollo versus Pan bitmasks, brute force, math	1800	x7368
1463C	Busy Robot implementation	1800	x5687
1462F	The Treasure of The Segments binary search, data structures, greedy	1800	x7061
1450D	Rating Compression binary search, data structures, greedy, implementation, two pointers	1800	x5522
1446B	Catching Cheaters dp, strings	1800	x7925
1442B	Identify the Operations combinatorics, data structures, dsu, greedy, implementation	1800	x4516
1442A	Extreme Subtraction constructive algorithms, dp, greedy	1800	x8940
1437C	Chef Monocarp dp, flows, graph matchings, greedy, math, sortings	1800	x10622
1426E	Rock, Paper, Scissors brute force, constructive algorithms, flows, greedy, math	1800	x7494
1420D	Rescue Nibel! combinatorics, data structures, sortings	1800	x7667
1409E	Two Platforms binary search, dp, sortings, two pointers	1800	x7891
1402A	Fancy Fence *special problem, data structures, dsu, implementation, math, sortings	1800	x1207
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x9392
1398D	Colored Rectangles dp, greedy, sortings	1800	x11584
1396B	Stoned Game brute force, constructive algorithms, games, greedy	1800	x11502
1394A	Boboniu Chats with Du dp, greedy, sortings, two pointers	1800	x6817
1388C	Uncle Bogdan and Country Happiness dfs and similar, greedy, math, trees	1800	x9787
1381B	Unmerge dp	1800	x8984
1367D	Task On The Board constructive algorithms, greedy, implementation, sortings	1800	x8385
1355C	Count Triangles binary search, implementation, math, two pointers	1800	x10752
1338B	Edge Weight Assignment bitmasks, constructive algorithms, dfs and similar, greedy, math, trees	1800	x8529
1335E2	Three Blocks Palindrome (hard version) brute force, data structures, dp, two pointers	1800	x8397
1334D	Minimum Euler Cycle constructive algorithms, graphs, greedy, implementation	1800	x7361
1329A	Dreamoon Likes Coloring constructive algorithms, greedy, implementation, math	1800	x9190
1328D	Carousel constructive algorithms, dp, graphs, greedy, math	1800	x13313
1327E	Count The Blocks combinatorics, dp, math	1800	x9023
1326D2	Prefix-Suffix Palindrome (Hard version) binary search, greedy, hashing, string suffix structures, strings	1800	x10280
1324F	Maximum White Subtree dfs and similar, dp, graphs, trees	1800	x10284
1316C	Primitive Primes constructive algorithms, math, ternary search	1800	x7314
1304D	Shortest and Longest LIS constructive algorithms, graphs, greedy, two pointers	1800	x6360
1299B	Aerodynamic geometry	1800	x5273
1296E1	String Coloring (easy version) constructive algorithms, dp, graphs, greedy, sortings	1800	x7548
1295D	Same GCDs math, number theory	1800	x9054
1290B	Irreducible Anagrams binary search, constructive algorithms, data structures, strings, two pointers	1800	x5536
1286B	Numbers on Tree constructive algorithms, data structures, dfs and similar, graphs, greedy, trees	1800	x4759
1286A	Garland dp, greedy, sortings	1800	x8886
1283E	New Year Parties dp, greedy	1800	x6626
1283D	Christmas Trees graphs, greedy, shortest paths	1800	x7875
1282C	Petya and Exam greedy, sortings, two pointers	1800	x4337
1280B	Beingawesomeism implementation, math	1800	x4021
1267L	Lexicography constructive algorithms, strings	1800	x3130
1267J	Just Arrange the Icons greedy, implementation, math	1800	x2882
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4701
1252H	Twin Buildings greedy, implementation	1800	x2694
1250J	The Parade binary search, greedy	1800	x2970
1250B	The Feast and the Bus brute force, constructive algorithms, greedy, math	1800	x2619
1249D2	Too Many Segments (hard version) data structures, greedy, sortings	1800	x5318
1249D1	Too Many Segments (easy version) greedy	1800	x5142
1244D	Paint the Tree brute force, constructive algorithms, dp, graphs, implementation, trees	1800	x7632
1227D2	Optimal Subsequences (Hard Version) data structures, greedy	1800	x4411
1225D	Power Products hashing, math, number theory	1800	x8202
1221D	Make The Fence Great Again dp	1800	x9222
1213G	Path Queries divide and conquer, dsu, graphs, sortings, trees	1800	x7440
1208C	Magic Grid constructive algorithms	1800	x6052
1207D	Number Of Permutations combinatorics	1800	x6124
1196E	Connected Component on a Chessboard constructive algorithms, implementation	1800	x3753
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4684
1190B	Tokitsukaze, CSL and Stone Game games	1800	x6475
1187C	Vasya And Array constructive algorithms, greedy, implementation	1800	x6397
1186C	Vus the Cossack and Strings implementation, math	1800	x6143
1179B	Tolik and His Uncle constructive algorithms	1800	x4395
1177B	Digits Sequence (Hard Edition) binary search, divide and conquer, implementation	1800	x2601
1176D	Recover it! dfs and similar, graphs, greedy, number theory, sortings	1800	x5329
1172A	Nauuo and Cards greedy, implementation	1800	x5001
1156B	Ugly Pairs dfs and similar, greedy, implementation, sortings, strings	1800	x6247
1154E	Two Teams data structures, implementation, sortings	1800	x6364
1152C	Neko does Maths brute force, math, number theory	1800	x6722
1151C	Problem for Nazar constructive algorithms, math	1800	x5372
1148D	Dirty Deeds Done Dirt Cheap greedy, sortings	1800	x5004
1138B	Circus brute force, greedy, math, strings	1800	x4039
1136D	Nastya Is Buying Lunch greedy	1800	x3832
1133E	K Balanced Teams dp, sortings, two pointers	1800	x5579
1129A2	Toy Train brute force, greedy	1800	x4113
1119D	Frets On Fire binary search, sortings	1800	x4875
1118F1	Tree Cutting (Easy Version) dfs and similar, trees	1800	x6006
1109B	Sasha and One More Name constructive algorithms, hashing, strings	1800	x4372
1108E1	Array and Segments (Easy version) brute force, greedy, implementation	1800	x4566
1107D	Compression dp, implementation, math, number theory	1800	x3740
1096D	Easy Problem dp	1800	x8199
1090D	Similar Arrays constructive algorithms	1800	x2113