Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
1812J	Unmysterious Language *special problem, constructive algorithms, strings		x6329
1812A	Are You a Robot? special problem, special problem, *special problem, expression parsing, strings		x14406
1811A	Insert Digit greedy, math, strings	800	x35250
1807C	Find and Replace greedy, implementation, strings	800	x35096
1805B	The String Has a Target greedy, strings	800	x20651
1801G	A task for substrings data structures, string suffix structures, strings	3400	x800
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x4939
1800E2	Unforgivable Curse (hard version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings	1500	x15809
1800E1	Unforgivable Curse (easy version) brute force, constructive algorithms, dsu, graphs, greedy, strings	1400	x16123
1800D	Remove Two Letters data structures, greedy, hashing, strings	1200	x30723
1800B	Count the Number of Pairs greedy, strings	1000	x29260
1800A	Is It a Cat? implementation, strings	800	x37920
1799C	Double Lexicographically Minimum greedy, strings	1700	x7095
1796B	Asterisk-Minor Template implementation, strings	1000	x18625
1796A	Typical Interview Problem brute force, implementation, strings	800	x19819
1795A	Two Towers brute force, implementation, strings	800	x24869
1794A	Prefix and Suffix Array strings	800	x19200
1791D	Distinct Split brute force, greedy, strings	1000	x55431
1791A	Codeforces Checking implementation, strings	800	x85804
1790A	Polycarp and the Day of Pi implementation, math, strings	800	x41763
1789F	Serval and Brain Power bitmasks, brute force, dp, greedy, implementation, strings	2700	x1047
1789B	Serval and Inversion Magic brute force, implementation, strings, two pointers	800	x17791
1781C	Equal Frequencies brute force, constructive algorithms, greedy, implementation, sortings, strings	1600	x11402
1779A	Hall of Fame constructive algorithms, greedy, strings	800	x24184
1778C	Flexible String bitmasks, brute force, strings	1600	x11999
1777F	Comfortably Numb bitmasks, data structures, divide and conquer, strings, trees	2400	x1540
1776G	Another Wine Tasting Event combinatorics, constructive algorithms, math, strings	2100	x2501
1771F	Hossam and Range Minimum Query binary search, bitmasks, data structures, hashing, probabilities, strings, trees	2500	x1792
1771D	Hossam and (sub-)palindromic tree brute force, data structures, dfs and similar, dp, strings, trees	2100	x3350
1760B	Atilla's Favorite Problem greedy, implementation, strings	800	x55074
1759A	Yes-Yes? implementation, strings	800	x33193
1758A	SSeeeeiinngg DDoouubbllee constructive algorithms, strings	800	x27316
1750F	Majority combinatorics, dp, math, strings	2700	x1310
1750E	Bracket Cost binary search, data structures, divide and conquer, dp, greedy, strings	2400	x1735
1748B	Diverse Substrings brute force, implementation, strings	1400	x17090
1742F	Smaller constructive algorithms, greedy, strings	1500	x14546
1741A	Compare T-Shirt Sizes implementation, implementation, strings	800	x34226
1739F	Keyboard Design bitmasks, data structures, dp, string suffix structures, strings	2600	x693
1738H	Palindrome Addicts data structures, strings	3300	x321
1737A	Ela Sorting Books greedy, implementation, strings	900	x11021
1736D	Equal Binary Subsequences constructive algorithms, geometry, greedy, implementation, strings	2200	x2841
1735C	Phase Shift dfs and similar, dsu, graphs, greedy, implementation, strings	1400	x11111
1730D	Prefixes and Suffixes constructive algorithms, strings, two pointers	2200	x3113
1729G	Cut Substrings combinatorics, dp, hashing, strings, two pointers	2100	x2628
1729C	Jumping on Tiles constructive algorithms, strings	1100	x21857
1729B	Decode String greedy, strings	800	x32820
1721E	Prefix Function Queries dfs and similar, dp, hashing, string suffix structures, strings, trees	2200	x2783
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x2319
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x6842
1714D	Color with Occurrences brute force, data structures, dp, greedy, strings	1600	x10581
1709C	Recover an RBS constructive algorithms, greedy, implementation, strings	1800	x10811
1706A	Another String Minimization Problem 2-sat, constructive algorithms, greedy, string suffix structures, strings	800	x24418
1704G	Mio and Lucky Array constructive algorithms, fft, math, strings	3500	x186
1703D	Double Strings brute force, data structures, strings	1100	x30125
1703C	Cypher brute force, implementation, strings	800	x42187
1703A	YES or YES? brute force, implementation, strings	800	x103857
1701E	Text Editor brute force, dp, greedy, strings	2500	x1436
1697C	awoo's Favorite Problem binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers	1400	x16069
1691C	Sum of Substrings brute force, constructive algorithms, greedy, math, strings	1400	x17558
1690F	Shifting String graphs, math, number theory, strings	1700	x9390
1688C	Manipulating History constructive algorithms, greedy, strings	1700	x8888
1685B	Linguistics greedy, implementation, sortings, strings	2000	x3766
1684A	Digit Minimization constructive algorithms, games, math, strings	800	x25129
1682A	Palindromic Indices greedy, strings	800	x20108
1680C	Binary String binary search, greedy, strings, two pointers	1600	x11425
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1474
1676C	Most Similar Words brute force, greedy, implementation, implementation, math, strings	800	x36075
1675E	Replace With the Previous, Minimize dsu, greedy, strings	1500	x12328
1674C	Infinite Replacement combinatorics, implementation, strings	1000	x26867
1673B	A Perfectly Balanced String? brute force, greedy, strings	1100	x23991
1673A	Subtle Substring Subtraction games, greedy, strings	800	x19238
1670B	Dorms War brute force, implementation, strings	1100	x13615
1669E	2-Letter Strings data structures, math, strings	1200	x22214
1663G	Six Characters *special problem, constructive algorithms, strings		x233
1663F	In Every Generation... *special problem, strings		x390
1662D	Evolution of Weasels greedy, implementation, strings		x2252
1662B	Toys greedy, strings		x153
1660F2	Promising String (hard version) data structures, implementation, math, strings	2100	x3251
1660F1	Promising String (easy version) brute force, implementation, math, strings	1700	x8072
1660C	Get an Even String dp, greedy, strings	1300	x22493
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x12275
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1569
1654B	Prefix Removals strings	800	x16969
1650A	Deletions of Two Adjacent Letters implementation, strings	800	x37718
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x7190
1634A	Reverse and Concatenate greedy, strings	800	x24760
1628B	Peculiar Movie Preferences greedy, strings	1700	x12929
1626B	Minor Reduction greedy, strings	1100	x24215
1624E	Masha-forgetful brute force, constructive algorithms, dp, hashing, implementation, strings	2000	x4716
1624D	Palindromes Coloring binary search, greedy, sortings, strings	1400	x19580
1623E	Middle Duplication data structures, dfs and similar, greedy, strings, trees	2500	x1377
1619A	Square String? implementation, strings	800	x64750
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4843
1617A	Forbidden Subsequence constructive algorithms, greedy, sortings, strings	800	x17134
1616E	Lexicographically Small Enough brute force, data structures, greedy, strings	2200	x2784
1616B	Mirror in the String greedy, strings	1100	x20873
1609B	William the Vigilant implementation, strings	1100	x12229
1608G	Alphabetic Tree binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees	3500	x327
1607A	Linear Keyboard implementation, strings	800	x41486
1606A	AB Balance strings	900	x41788

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