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
1806D	DSU Master combinatorics, dp, dsu, math	2500	x915
1806C	Sequence Master brute force, constructive algorithms, math	1600	x7615
1806B	Mex Master constructive algorithms, greedy	900	x17733
1806A	Walking Master geometry, greedy, math	800	x24776
1805F2	Survival of the Weakest (hard version) greedy, math, sortings, two pointers	3100	x349
1805F1	Survival of the Weakest (easy version) binary search, brute force, implementation, math, sortings	2600	x906
1805E	There Should Be a Lot of Maximums brute force, data structures, dfs and similar, dp, trees, two pointers	2300	x1612
1805D	A Wide, Wide Graph dfs and similar, dp, graphs, greedy, trees	1800	x6562
1805C	Place for a Selfie binary search, data structures, geometry, math	1400	x12566
1805B	The String Has a Target greedy, strings	800	x18553
1805A	We Need the Zero bitmasks, brute force	800	x23538
1804H	Code Lock bitmasks, dp	3300	x185
1804G	Flow Control data structures, dsu, implementation	3500	x202
1804F	Approximate Diameter binary search, divide and conquer, graphs, shortest paths	2700	x911
1804E	Routing bitmasks, brute force, dfs and similar, dp, graphs	2400	x1452
1804D	Accommodation brute force, dp, greedy, implementation	2000	x4641
1804C	Pull Your Luck brute force, greedy, math, number theory	1500	x12131
1804B	Vaccination greedy, implementation	1000	x14266
1804A	Lame King greedy, math	800	x17939
1802B	Settlement of Guinea Pigs greedy, implementation, math	1000	x13334
1802A	Likes greedy, implementation	800	x15823
1801G	A task for substrings data structures, string suffix structures, strings	3400	x377
1801F	Another n-dimensional chocolate bar dp, math, meet-in-the-middle, number theory	2700	x588
1801E	Gasoline prices data structures, divide and conquer, dsu, hashing, trees	3000	x452
1801D	The way home binary search, data structures, dp, graphs, greedy, shortest paths, sortings	2100	x2218
1801C	Music Festival binary search, data structures, dp, greedy, sortings	1900	x3437
1801B	Buying gifts data structures, greedy, sortings	1800	x6239
1801A	The Very Beautiful Blanket bitmasks, constructive algorithms	1600	x8571
1800G	Symmetree dfs and similar, hashing, implementation, trees	2200	x2075
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3890
1800E2	Unforgivable Curse (hard version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings	1500	x12823
1800E1	Unforgivable Curse (easy version) brute force, constructive algorithms, dsu, graphs, greedy, strings	1400	x12827
1800D	Remove Two Letters data structures, greedy, hashing, strings	1200	x23591
1800C2	Powering the Hero (hard version) data structures, greedy	1100	x22472
1800C1	Powering the Hero (easy version) data structures, greedy	1000	x23543
1800B	Count the Number of Pairs greedy, strings	1000	x25140
1800A	Is It a Cat? implementation, strings	800	x31454
1799H	Tree Cutting bitmasks, dfs and similar, dp	3200	x281
1799G	Count Voting combinatorics, dp, math	2600	x769
1799F	Halve or Subtract binary search, brute force, dp, greedy, sortings	2700	x834
1799E	City Union constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math	2300	x1202
1799D2	Hot Start Up (hard version) data structures, dp	2100	x2442
1799D1	Hot Start Up (easy version) dp	1900	x4468
1799C	Double Lexicographically Minimum greedy, strings	1700	x5819
1799B	Equalize by Divide brute force, constructive algorithms, greedy, math	1200	x11358
1799A	Recent Actions data structures, greedy, implementation, math	800	x11587
1798F	Gifts from Grandfather Ahmed dp, math, number theory	2500	x495
1798E	Multitest Generator brute force, dp	2300	x1601
1798D	Shocking Arrangement constructive algorithms, greedy, math	1600	x9867
1798C	Candy Store greedy, math, number theory	1700	x8193
1798B	Three Sevens brute force, data structures, greedy, implementation	1000	x16590
1798A	Showstopper greedy, implementation, sortings	800	x19690
1797F	Li Hua and Path data structures, dfs and similar, divide and conquer, dsu, trees	3000	x352
1797E	Li Hua and Array brute force, data structures, dsu, math, number theory, two pointers	2300	x1270
1797D	Li Hua and Tree brute force, data structures, dfs and similar, dp, implementation, trees	1900	x3956
1797C	Li Hua and Chess constructive algorithms, greedy, interactive	1600	x7633
1797B	Li Hua and Pattern constructive algorithms, greedy	1100	x15988
1797A	Li Hua and Maze constructive algorithms, flows, graphs, greedy, implementation	800	x17434
1796F	Strange Triples brute force, math, number theory	2900	x172
1796E	Colored Subgraphs dfs and similar, dp, games, greedy, trees	2500	x757
1796D	Maximum Subarray data structures, dp, greedy, two pointers	2000	x4337
1796C	Maximum Set binary search, math	1600	x10416
1796B	Asterisk-Minor Template implementation, strings	1000	x16565
1796A	Typical Interview Problem brute force, implementation, strings	800	x18855
1795G	Removal Sequences bitmasks, dfs and similar, graphs	2700	x684
1795F	Blocking Chips binary search, constructive algorithms, dfs and similar, greedy, trees	2400	x1111
1795E	Explosions? binary search, data structures, dp, greedy, math	2200	x2019
1795D	Triangle Coloring combinatorics, math	1600	x9144
1795C	Tea Tasting binary search, data structures, implementation	1500	x12448
1795B	Ideal Point brute force, geometry, greedy	900	x22063
1795A	Two Towers brute force, implementation, strings	800	x23610
1794E	Labeling the Tree with Distances data structures, dp, greedy, hashing, implementation, trees	2400	x1090
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3589
1794C	Scoring Subsequences binary search, greedy, math, two pointers	1300	x13834
1794B	Not Dividing constructive algorithms, greedy, math	900	x22394
1794A	Prefix and Suffix Array strings	800	x17175
1793F	Rebrending brute force, data structures, divide and conquer, implementation	2600	x1378
1793E	Velepin and Marketing binary search, data structures, dp, greedy, sortings, two pointers	2600	x1060
1793D	Moscow Gorillas binary search, dp, greedy, implementation, math, two pointers	1800	x6137
1793C	Dora and Search constructive algorithms, data structures, two pointers	1200	x20325
1793B	Fedya and Array constructive algorithms, math	1100	x15817
1793A	Yet Another Promotion greedy, math	800	x18037
1792F2	Graph Coloring (hard version) brute force, combinatorics, divide and conquer, dp, fft, graphs	2900	x390
1792F1	Graph Coloring (easy version) combinatorics, dp, graphs	2700	x720
1792E	Divisors and Table brute force, dfs and similar, dp, number theory	2400	x1382
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x6262
1792C	Min Max Sort binary search, brute force, greedy, math, two pointers	1500	x14116
1792B	Stand-up Comedian greedy, math	1200	x21369
1792A	GamingForces greedy, sortings	800	x28082
1791G2	Teleporters (Hard Version) binary search, greedy, sortings	1900	x4792
1791G1	Teleporters (Easy Version) greedy, sortings	1100	x22625
1791F	Range Update Point Query binary search, brute force, data structures	1500	x12427
1791E	Negatives and Positives dp, greedy, sortings	1100	x28387
1791D	Distinct Split brute force, greedy, strings	1000	x30612
1791C	Prepend and Append implementation, two pointers	800	x45316
1791B	Following Directions geometry, implementation	800	x44367
1791A	Codeforces Checking implementation, strings	800	x60451
1790G	Tokens on Graph constructive algorithms, dfs and similar, graphs, shortest paths	2300	x1122
1790F	Timofey and Black-White Tree brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees	2100	x3353
1790E	Vlad and a Pair of Numbers bitmasks, constructive algorithms	1400	x15127