Problemset - Codeforces

Please subscribe to the official Codeforces channel in Telegram via the link https://t.me/codeforces_official. ×

→ Pay attention

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

*has extra registration

→ Filter Problems

Difficulty: —

strings

Add tag

Problems

#	Name
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings		x75
1992E	Novice's Mistake brute force, constructive algorithms, implementation, math, strings	1700	x7249
1989B	Substring and Subsequence brute force, greedy, strings	1200	x17118
1985A	Creating Words implementation, strings	800	x44762
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x2828
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1013
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5819
1976A	Verify Password implementation, sortings, strings	800	x26172
1975H	378QAQ and Core greedy, strings	3500	x88
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x200
1974B	Symmetric Encoding implementation, sortings, strings	800	x28497
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x23639
1971B	Different String implementation, strings	800	x33368
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x168
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x510
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1724
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x3825
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1686
1952H	Palindrome implementation, strings		x394
1952B	Is it stated? strings		x10638
1952A	Are You a Robot, Again? strings		x11807
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3346
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3972
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x13332
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x8777
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3577
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x31656
1935A	Entertainment in MAC constructive algorithms, strings	800	x26797
1931A	Recovering a Small String brute force, strings	800	x34868
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2499
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3897
1927B	Following the String constructive algorithms, greedy, strings	900	x31760
1927A	Make it White greedy, strings	800	x41406
1925A	We Got Everything Covered! constructive algorithms, greedy, strings	800	x28009
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x13111
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x355
1922A	Tricky Template constructive algorithms, implementation, strings	800	x26451
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x20728
1915D	Unnatural Language Processing greedy, implementation, strings	900	x29026
1914A	Problemsolving Log implementation, strings	800	x30742
1913F	Palindromic Problem binary search, data structures, hashing, string suffix structures, strings	2800	x304
1913B	Swap and Delete strings	1000	x24033
1912L	LOL Lovers strings	800	x6680
1909G	Pumping Lemma hashing, strings	3000	x371
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x19291
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x24403
1905C	Largest Subsequence greedy, strings	1400	x11600
1902E	Collapsing Strings data structures, strings, trees	1900	x4080
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x24368
1898E	Sofia and Strings data structures, greedy, sortings, strings, two pointers	2200	x2160
1898A	Milica and String brute force, implementation, strings	800	x15550
1896B	AB Flipping greedy, strings, two pointers	900	x14132
1894A	Secret Sport implementation, strings	800	x18550
1886C	Decreasing String implementation, strings	1600	x10895
1883B	Chemistry strings	900	x29394
1881A	Don't Try to Count brute force, strings	800	x29543
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16391
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2520
1864B	Swap and Reverse constructive algorithms, greedy, sortings, strings	1100	x15086
1862A	Gift Carpet dp, greedy, implementation, strings	800	x31701
1861C	Queries for the Array data structures, dfs and similar, implementation, strings, trees	1600	x9797
1860A	Not a Substring constructive algorithms, strings	900	x21299
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5576
1850C	Word on the Paper implementation, strings	800	x42743
1849C	Binary String Copying binary search, brute force, data structures, hashing, strings	1600	x10196
1847D	Professor Higashikata data structures, dsu, greedy, implementation, strings	1900	x3673
1846B	Rudolph and Tic-Tac-Toe brute force, implementation, strings	800	x26539
1845C	Strong Password binary search, dp, greedy, strings	1400	x13810
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x12031
1841C	Ranom Numbers brute force, dp, greedy, math, strings	1800	x7609
1840A	Cipher Shifer implementation, strings, two pointers	800	x33439
1838D	Bracket Walk data structures, greedy, strings	2100	x3144
1834C	Game with Reversing games, greedy, math, strings	1200	x12994
1833A	Musical Puzzle implementation, strings	800	x32140
1832A	New Palindrome strings	800	x25227
1829A	Love Story implementation, strings	800	x48401
1827C	Palindrome Partition binary search, brute force, data structures, dp, hashing, strings	2600	x1166
1825A	LuoTianyi and the Palindrome String greedy, strings	800	x19477
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3746
1822E	Making Anti-Palindromes greedy, math, strings	1600	x10138
1821E	Rearrange Brackets brute force, dp, greedy, sortings, strings	2100	x2324
1821C	Tear It Apart brute force, implementation, math, strings	1300	x13973
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x14048
1820A	Yura's New Name implementation, strings	800	x16525
1817F	Entangled Substrings string suffix structures, strings	3500	x186
1815E	Bosco and Particle dp, math, number theory, strings	3100	x333
1812J	Unmysterious Language *special problem, constructive algorithms, strings		x5847
1812A	Are You a Robot? special problem, special problem, *special problem, expression parsing, strings		x13167
1811A	Insert Digit greedy, math, strings	800	x30574
1807C	Find and Replace greedy, implementation, strings	800	x29806
1805B	The String Has a Target greedy, strings	800	x18382
1801G	A task for substrings data structures, string suffix structures, strings	3400	x357
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3792
1800E2	Unforgivable Curse (hard version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings	1500	x12422
1800E1	Unforgivable Curse (easy version) brute force, constructive algorithms, dsu, graphs, greedy, strings	1400	x12474
1800D	Remove Two Letters data structures, greedy, hashing, strings	1200	x22509
1800B	Count the Number of Pairs greedy, strings	1000	x24529
1800A	Is It a Cat? implementation, strings	800	x30722
1799C	Double Lexicographically Minimum greedy, strings	1700	x5674
1796B	Asterisk-Minor Template implementation, strings	1000	x16301

←