Problemset - Codeforces

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Refact.ai Match 1 (Codeforces Round 985)
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Problems

#	Name
2025A	Two Screens binary search, greedy, strings, two pointers	800	x22746
2023C	C+K+S constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings	2400	x847
2013C	Password Cracking constructive algorithms, interactive, strings	1400	x11400
2011E	Rock-Paper-Scissors Bot *special problem, greedy, strings		x158
2010C2	Message Transmission Error (hard version) hashing, string suffix structures, strings, two pointers	1700	x3021
2010C1	Message Transmission Error (easy version) brute force, strings	1400	x6831
2008E	Alternating String brute force, data structures, dp, greedy, implementation, strings	1500	x9764
2008B	Square or Not brute force, math, strings	800	x28134
2005C	Lazy Narek dp, implementation, strings	1800	x6873
2003C	Turtle and Good Pairs constructive algorithms, greedy, sortings, strings	1200	x17888
2003A	Turtle and Good Strings greedy, strings	800	x28652
2000C	Numeric String Template data structures, strings	1000	x25084
2000A	Primary Task implementation, math, strings	800	x36908
1999D	Slavic's Exam greedy, implementation, strings	1100	x26655
1997A	Strong Password brute force, implementation, strings	800	x28670
1996C	Sort dp, greedy, sortings, strings	1200	x22657
1995D	Cases bitmasks, brute force, dp, strings	2300	x2330
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x700
1992E	Novice's Mistake brute force, constructive algorithms, implementation, math, strings	1700	x9066
1989B	Substring and Subsequence brute force, greedy, strings	1200	x20023
1985A	Creating Words implementation, strings	800	x53265
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x3246
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1236
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x6575
1976A	Verify Password implementation, sortings, strings	800	x28486
1975H	378QAQ and Core greedy, strings	3500	x115
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x223
1974B	Symmetric Encoding implementation, sortings, strings	800	x30158
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x25810
1971B	Different String implementation, strings	800	x36772
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x206
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x622
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1955
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x4244
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1933
1952H	Palindrome implementation, strings		x698
1952B	Is it stated? strings		x11134
1952A	Are You a Robot, Again? strings		x12421
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3637
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x4380
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x14431
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x9462
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3862
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x33415
1935A	Entertainment in MAC constructive algorithms, strings	800	x27960
1931A	Recovering a Small String brute force, strings	800	x36247
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2638
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4133
1927B	Following the String constructive algorithms, greedy, strings	900	x33306
1927A	Make it White greedy, strings	800	x43628
1925A	We Got Everything Covered! constructive algorithms, greedy, strings	800	x28921
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x14043
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x378
1922A	Tricky Template constructive algorithms, implementation, strings	800	x27045
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x22613
1915D	Unnatural Language Processing greedy, implementation, strings	900	x30485
1914A	Problemsolving Log implementation, strings	800	x31930
1913F	Palindromic Problem binary search, data structures, hashing, string suffix structures, strings	2800	x328
1913B	Swap and Delete strings	1000	x27408
1912L	LOL Lovers strings	800	x7055
1909G	Pumping Lemma hashing, strings	3000	x405
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x20345
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x25853
1905C	Largest Subsequence greedy, strings	1400	x12398
1902E	Collapsing Strings data structures, strings, trees	1900	x4357
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x28700
1898E	Sofia and Strings data structures, greedy, sortings, strings, two pointers	2200	x2296
1898A	Milica and String brute force, implementation, strings	800	x16089
1896B	AB Flipping greedy, strings, two pointers	900	x14953
1894A	Secret Sport implementation, strings	800	x18989
1886C	Decreasing String implementation, strings	1600	x11650
1883B	Chemistry strings	900	x32905
1881A	Don't Try to Count brute force, strings	800	x32609
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16836
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2664
1864B	Swap and Reverse constructive algorithms, greedy, sortings, strings	1100	x15425
1862A	Gift Carpet dp, greedy, implementation, strings	800	x32626
1861C	Queries for the Array data structures, dfs and similar, implementation, strings, trees	1600	x10235
1860A	Not a Substring constructive algorithms, strings	900	x21793
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5917
1850C	Word on the Paper implementation, strings	800	x44624
1849C	Binary String Copying binary search, brute force, data structures, hashing, strings	1600	x10628
1847D	Professor Higashikata data structures, dsu, greedy, implementation, strings	1900	x3817
1846B	Rudolph and Tic-Tac-Toe brute force, implementation, strings	800	x26958
1845C	Strong Password binary search, dp, greedy, strings	1400	x14397
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x12374
1841C	Ranom Numbers brute force, dp, greedy, math, strings	1800	x7889
1840A	Cipher Shifer implementation, strings, two pointers	800	x34243
1838D	Bracket Walk data structures, greedy, strings	2100	x3276
1834C	Game with Reversing games, greedy, math, strings	1200	x13419
1833A	Musical Puzzle implementation, strings	800	x32743
1832A	New Palindrome strings	800	x25857
1829A	Love Story implementation, strings	800	x51794
1827C	Palindrome Partition binary search, brute force, data structures, dp, hashing, strings	2600	x1227
1825A	LuoTianyi and the Palindrome String greedy, strings	800	x19706
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3862
1822E	Making Anti-Palindromes greedy, math, strings	1600	x10544
1821E	Rearrange Brackets brute force, dp, greedy, sortings, strings	2100	x2389
1821C	Tear It Apart brute force, implementation, math, strings	1300	x14424
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x14918

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