Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
1989B	Substring and Subsequence brute force, greedy, strings	1200	x13703
1985A	Creating Words implementation, strings	800	x41826
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x2653
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x934
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5437
1976A	Verify Password implementation, sortings, strings	800	x25239
1975H	378QAQ and Core greedy, strings	3500	x77
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x193
1974B	Symmetric Encoding implementation, sortings, strings	800	x27877
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x22972
1971B	Different String implementation, strings	800	x32594
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x162
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x487
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1669
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x3683
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1620
1952H	Palindrome implementation, strings		x384
1952B	Is it stated? strings		x10562
1952A	Are You a Robot, Again? strings		x11715
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3273
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3863
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x13087
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x8652
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3520
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x31181
1935A	Entertainment in MAC constructive algorithms, strings	800	x26520
1931A	Recovering a Small String brute force, strings	800	x34527
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2458
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3841
1927B	Following the String constructive algorithms, greedy, strings	900	x31409
1927A	Make it White greedy, strings	800	x41007
1925A	We Got Everything Covered! constructive algorithms, greedy, strings	800	x27828
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x12909
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x345
1922A	Tricky Template constructive algorithms, implementation, strings	800	x26322
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x20379
1915D	Unnatural Language Processing greedy, implementation, strings	900	x28679
1914A	Problemsolving Log implementation, strings	800	x30500
1913F	Palindromic Problem binary search, data structures, hashing, string suffix structures, strings	2800	x296
1913B	Swap and Delete strings	1000	x23502
1912L	LOL Lovers strings	800	x6568
1909G	Pumping Lemma hashing, strings	3000	x355
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x19053
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x24144
1905C	Largest Subsequence greedy, strings	1400	x11441
1902E	Collapsing Strings data structures, strings, trees	1900	x4010
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x23719
1898E	Sofia and Strings data structures, greedy, sortings, strings, two pointers	2200	x2124
1898A	Milica and String brute force, implementation, strings	800	x15416
1896B	AB Flipping greedy, strings, two pointers	900	x13949
1894A	Secret Sport implementation, strings	800	x18427
1886C	Decreasing String implementation, strings	1600	x10693
1883B	Chemistry strings	900	x28793
1881A	Don't Try to Count brute force, strings	800	x28936
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16274
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2504
1864B	Swap and Reverse constructive algorithms, greedy, sortings, strings	1100	x14986
1862A	Gift Carpet dp, greedy, implementation, strings	800	x31494
1861C	Queries for the Array data structures, dfs and similar, implementation, strings, trees	1600	x9707
1860A	Not a Substring constructive algorithms, strings	900	x21187
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5508
1850C	Word on the Paper implementation, strings	800	x42345
1849C	Binary String Copying binary search, brute force, data structures, hashing, strings	1600	x10094
1847D	Professor Higashikata data structures, dsu, greedy, implementation, strings	1900	x3654
1846B	Rudolph and Tic-Tac-Toe brute force, implementation, strings	800	x26416
1845C	Strong Password binary search, dp, greedy, strings	1400	x13650
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11915
1841C	Ranom Numbers brute force, dp, greedy, math, strings	1800	x7466
1840A	Cipher Shifer implementation, strings, two pointers	800	x33266
1838D	Bracket Walk data structures, greedy, strings	2100	x3128
1834C	Game with Reversing games, greedy, math, strings	1200	x12894
1833A	Musical Puzzle implementation, strings	800	x32001
1832A	New Palindrome strings	800	x25136
1829A	Love Story implementation, strings	800	x47860
1827C	Palindrome Partition binary search, brute force, data structures, dp, hashing, strings	2600	x1163
1825A	LuoTianyi and the Palindrome String greedy, strings	800	x19416
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3724
1822E	Making Anti-Palindromes greedy, math, strings	1600	x10000
1821E	Rearrange Brackets brute force, dp, greedy, sortings, strings	2100	x2296
1821C	Tear It Apart brute force, implementation, math, strings	1300	x13850
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x13862
1820A	Yura's New Name implementation, strings	800	x16488
1817F	Entangled Substrings string suffix structures, strings	3500	x186
1815E	Bosco and Particle dp, math, number theory, strings	3100	x332
1812J	Unmysterious Language *special problem, constructive algorithms, strings		x5834
1812A	Are You a Robot? special problem, special problem, *special problem, expression parsing, strings		x13149
1811A	Insert Digit greedy, math, strings	800	x30444
1807C	Find and Replace greedy, implementation, strings	800	x29658
1805B	The String Has a Target greedy, strings	800	x18338
1801G	A task for substrings data structures, string suffix structures, strings	3400	x356
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3769
1800E2	Unforgivable Curse (hard version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings	1500	x12327
1800E1	Unforgivable Curse (easy version) brute force, constructive algorithms, dsu, graphs, greedy, strings	1400	x12377
1800D	Remove Two Letters data structures, greedy, hashing, strings	1200	x22250
1800B	Count the Number of Pairs greedy, strings	1000	x24364
1800A	Is It a Cat? implementation, strings	800	x30482
1799C	Double Lexicographically Minimum greedy, strings	1700	x5627
1796B	Asterisk-Minor Template implementation, strings	1000	x16206
1796A	Typical Interview Problem brute force, implementation, strings	800	x18658
1795A	Two Towers brute force, implementation, strings	800	x23403

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