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
1835C	Twin Clusters bitmasks, brute force, constructive algorithms, math, probabilities	2600	x994
1835B	Lottery binary search, brute force, greedy, math, two pointers	2500	x941
1835A	k-th equality brute force, implementation, math	1700	x7820
1834F	Typewriter brute force, math	2500	x524
1834E	MEX of LCM binary search, data structures, implementation, math, number theory	2300	x2241
1834D	Survey in Class brute force, data structures, greedy, implementation, sortings	1900	x4663
1834C	Game with Reversing games, greedy, math, strings	1200	x13278
1834B	Maximum Strength greedy, math	1000	x15251
1834A	Unit Array greedy, math	800	x24448
1833G	Ksyusha and Chinchilla constructive algorithms, dfs and similar, dp, dsu, greedy, implementation, trees	1800	x5376
1833F	Ira and Flamenco combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers	1700	x7362
1833E	Round Dance dfs and similar, dsu, graphs, shortest paths	1600	x11763
1833D	Flipper brute force, constructive algorithms, greedy	1400	x13326
1833C	Vlad Building Beautiful Array greedy, math	800	x26091
1833B	Restore the Weather greedy, sortings	900	x26492
1833A	Musical Puzzle implementation, strings	800	x32598
1832F	Zombies binary search, dp	3200	x270
1832E	Combinatorics Problem brute force, combinatorics, dp	2200	x2170
1832D2	Red-Blue Operations (Hard Version) binary search, constructive algorithms, greedy, implementation, math	2400	x1905
1832D1	Red-Blue Operations (Easy Version) binary search, greedy, implementation, math	2100	x2937
1832C	Contrast Value greedy, implementation	1200	x20765
1832B	Maximum Sum brute force, sortings, two pointers	1100	x21991
1832A	New Palindrome strings	800	x25727
1831B	Array merging constructive algorithms, greedy	1000	x20848
1831A	Twin Permutations constructive algorithms	800	x26905
1830F	The Third Grace data structures, dp	3200	x244
1830E	Bully Sort data structures, math	3500	x243
1830D	Mex Tree brute force, dp, trees	2800	x679
1830C	Hyperregular Bracket Strings combinatorics, greedy, hashing, math, number theory, sortings	2400	x1662
1830B	The BOSS Can Count Pairs brute force, math	2000	x4882
1830A	Copil Copac Draws Trees dfs and similar, dp, graphs, trees	1400	x13552
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7746
1829G	Hits Different data structures, dp, implementation, math	1600	x10444
1829F	Forever Winter dfs and similar, graphs, math	1300	x17548
1829E	The Lakes dfs and similar, dsu, graphs, implementation	1100	x20022
1829D	Gold Rush brute force, dfs and similar, dp, implementation	1000	x26374
1829C	Mr. Perfectly Fine bitmasks, greedy, implementation	800	x28517
1829B	Blank Space implementation	800	x45878
1829A	Love Story implementation, strings	800	x50682
1828B	Permutation Swap math, number theory	900	x23114
1828A	Divisible Array constructive algorithms, math	800	x23649
1827F	Copium Permutation constructive algorithms, data structures, greedy	3500	x117
1827E	Bus Routes binary search, constructive algorithms, dfs and similar, greedy, trees	3400	x389
1827D	Two Centroids data structures, dfs and similar, greedy, trees	2800	x756
1827C	Palindrome Partition binary search, brute force, data structures, dp, hashing, strings	2600	x1211
1827B2	Range Sorting (Hard Version) binary search, data structures, dp, greedy	2400	x1876
1827B1	Range Sorting (Easy Version) binary search, dp, dsu, greedy, trees, two pointers	2000	x3873
1827A	Counting Orders combinatorics, math, sortings, two pointers	1100	x19040
1826F	Fading into Fog geometry, interactive, math, probabilities	2800	x380
1826E	Walk the Runway bitmasks, brute force, data structures, dp, graphs, implementation, sortings	2400	x1598
1826D	Running Miles brute force, dp, greedy	1700	x9801
1826C	Dreaming of Freedom greedy, math, number theory	1300	x13574
1826B	Lunatic Never Content math, number theory	1100	x17681
1826A	Trust Nobody brute force, greedy, implementation, sortings	1200	x15190
1825B	LuoTianyi and the Table greedy, math	1000	x14683
1825A	LuoTianyi and the Palindrome String greedy, strings	800	x19656
1824E	LuoTianyi and Cartridge data structures, trees	3500	x130
1824D	LuoTianyi and the Function data structures	3000	x490
1824C	LuoTianyi and XOR-Tree data structures, dfs and similar, dp, dsu, greedy, trees	2500	x1388
1824B2	LuoTianyi and the Floating Islands (Hard Version) combinatorics, dfs and similar, math, probabilities, trees	2300	x2630
1824B1	LuoTianyi and the Floating Islands (Easy Version) combinatorics, math, probabilities, trees	1800	x4586
1824A	LuoTianyi and the Show greedy, implementation	1400	x11306
1823F	Random Walk dp, graphs, math, probabilities, trees	2600	x877
1823E	Removing Graph brute force, dp, games, graphs, math	2500	x1243
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3832
1823C	Strongly Composite greedy, math, number theory	1300	x12288
1823B	Sort with Step brute force, math, sortings	900	x16022
1823A	A-characteristic combinatorics, constructive algorithms, math	800	x16142
1822G2	Magic Triples (Hard Version) brute force, data structures, math, number theory	2200	x2428
1822G1	Magic Triples (Easy Version) brute force, data structures, math, number theory	1700	x7051
1822F	Gardening Friends brute force, dfs and similar, dp, graphs, trees	1700	x6140
1822E	Making Anti-Palindromes greedy, math, strings	1600	x10443
1822D	Super-Permutation constructive algorithms, math	1200	x16731
1822C	Bun Lover math	800	x23014
1822B	Karina and Array greedy, math, sortings	800	x24735
1822A	TubeTube Feed brute force, implementation	800	x24257
1821F	Timber combinatorics, dp, fft, math	2600	x752
1821E	Rearrange Brackets brute force, dp, greedy, sortings, strings	2100	x2373
1821D	Black Cells binary search, brute force, greedy, math	1900	x4967
1821C	Tear It Apart brute force, implementation, math, strings	1300	x14287
1821B	Sort the Subarray brute force, greedy	1100	x18569
1821A	Matching combinatorics, math	800	x19780
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x14681
1820A	Yura's New Name implementation, strings	800	x16682
1819F	Willy-nilly, Crack, Into Release! data structures, dp	3500	x132
1819E	Roads in E City interactive, math, probabilities, trees	3200	x283
1819D	Misha and Apples brute force, data structures, dp, two pointers	2800	x637
1819C	The Fox and the Complete Tree Traversal constructive algorithms, dp, implementation, math, trees	2400	x1473
1819B	The Butcher geometry, greedy, implementation, sortings, two pointers	1900	x3586
1819A	Constructive Problem brute force, greedy	1300	x12682
1818B	Indivisible constructive algorithms	900	x14980
1818A	Politics greedy, implementation	800	x12959
1817F	Entangled Substrings string suffix structures, strings	3500	x206
1817E	Half-sum brute force, divide and conquer, greedy	3400	x260
1817D	Toy Machine constructive algorithms, games, implementation	2700	x779
1817C	Similar Polynomials combinatorics, math	2400	x979
1817B	Fish Graph brute force, constructive algorithms, dfs and similar, graphs	1900	x4136
1817A	Almost Increasing Subsequence binary search, data structures, greedy	1500	x11014
1816B	Grid Reconstruction constructive algorithms, greedy	1000	x15265
1816A	Ian Visits Mary constructive algorithms, geometry, number theory	800	x17575