Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
1992E	Novice's Mistake brute force, constructive algorithms, math, strings	1700	x5385
1989B	Substring and Subsequence brute force, greedy, strings	1200	x16191
1985A	Creating Words implementation, strings	800	x43668
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x2759
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x978
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5686
1976A	Verify Password implementation, sortings, strings	800	x25785
1975H	378QAQ and Core greedy, strings	3500	x83
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x196
1974B	Symmetric Encoding implementation, sortings, strings	800	x28309
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x23390
1971B	Different String implementation, strings	800	x33091
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x164
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x500
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1711
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x3784
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1662
1952H	Palindrome implementation, strings		x387
1952B	Is it stated? strings		x10604
1952A	Are You a Robot, Again? strings		x11770
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3316
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3930
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x13243
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x8717
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3560
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x31515
1935A	Entertainment in MAC constructive algorithms, strings	800	x26678
1931A	Recovering a Small String brute force, strings	800	x34717
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2484
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3878
1927B	Following the String constructive algorithms, greedy, strings	900	x31631
1927A	Make it White greedy, strings	800	x41254
1925A	We Got Everything Covered! constructive algorithms, greedy, strings	800	x27938
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x13017
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x348
1922A	Tricky Template constructive algorithms, implementation, strings	800	x26390
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x20573
1915D	Unnatural Language Processing greedy, implementation, strings	900	x28885
1914A	Problemsolving Log implementation, strings	800	x30660
1913F	Palindromic Problem binary search, data structures, hashing, string suffix structures, strings	2800	x300
1913B	Swap and Delete strings	1000	x23798
1912L	LOL Lovers strings	800	x6644
1909G	Pumping Lemma hashing, strings	3000	x368
1907C	Removal of Unattractive Pairs constructive algorithms, greedy, math, strings	1200	x19198
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x24297
1905C	Largest Subsequence greedy, strings	1400	x11535
1902E	Collapsing Strings data structures, strings, trees	1900	x4046
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x24063
1898E	Sofia and Strings data structures, greedy, sortings, strings, two pointers	2200	x2147
1898A	Milica and String brute force, implementation, strings	800	x15495
1896B	AB Flipping greedy, strings, two pointers	900	x14045
1894A	Secret Sport implementation, strings	800	x18501
1886C	Decreasing String implementation, strings	1600	x10800
1883B	Chemistry strings	900	x29136
1881A	Don't Try to Count brute force, strings	800	x29274
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16331
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2514
1864B	Swap and Reverse constructive algorithms, greedy, sortings, strings	1100	x15037
1862A	Gift Carpet dp, greedy, implementation, strings	800	x31612
1861C	Queries for the Array data structures, dfs and similar, implementation, strings, trees	1600	x9762
1860A	Not a Substring constructive algorithms, strings	900	x21258
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5551
1850C	Word on the Paper implementation, strings	800	x42576
1849C	Binary String Copying binary search, brute force, data structures, hashing, strings	1600	x10148
1847D	Professor Higashikata data structures, dsu, greedy, implementation, strings	1900	x3668
1846B	Rudolph and Tic-Tac-Toe brute force, implementation, strings	800	x26491
1845C	Strong Password binary search, dp, greedy, strings	1400	x13740
1844D	Row Major constructive algorithms, greedy, math, number theory, strings	1400	x11969
1841C	Ranom Numbers brute force, dp, greedy, math, strings	1800	x7501
1840A	Cipher Shifer implementation, strings, two pointers	800	x33378
1838D	Bracket Walk data structures, greedy, strings	2100	x3136
1834C	Game with Reversing games, greedy, math, strings	1200	x12945
1833A	Musical Puzzle implementation, strings	800	x32090
1832A	New Palindrome strings	800	x25190
1829A	Love Story implementation, strings	800	x48166
1827C	Palindrome Partition binary search, brute force, data structures, dp, hashing, strings	2600	x1166
1825A	LuoTianyi and the Palindrome String greedy, strings	800	x19447
1823D	Unique Palindromes constructive algorithms, math, strings	1900	x3738
1822E	Making Anti-Palindromes greedy, math, strings	1600	x10091
1821E	Rearrange Brackets brute force, dp, greedy, sortings, strings	2100	x2312
1821C	Tear It Apart brute force, implementation, math, strings	1300	x13935
1820B	JoJo's Incredible Adventures math, strings, two pointers	1100	x13958
1820A	Yura's New Name implementation, strings	800	x16504
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		x5841
1812A	Are You a Robot? special problem, special problem, *special problem, expression parsing, strings		x13160
1811A	Insert Digit greedy, math, strings	800	x30526
1807C	Find and Replace greedy, implementation, strings	800	x29745
1805B	The String Has a Target greedy, strings	800	x18360
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	x3780
1800E2	Unforgivable Curse (hard version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings	1500	x12378
1800E1	Unforgivable Curse (easy version) brute force, constructive algorithms, dsu, graphs, greedy, strings	1400	x12431
1800D	Remove Two Letters data structures, greedy, hashing, strings	1200	x22406
1800B	Count the Number of Pairs greedy, strings	1000	x24463
1800A	Is It a Cat? implementation, strings	800	x30661
1799C	Double Lexicographically Minimum greedy, strings	1700	x5657
1796B	Asterisk-Minor Template implementation, strings	1000	x16262
1796A	Typical Interview Problem brute force, implementation, strings	800	x18680

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