Problemset - Codeforces

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Codeforces Round 955 (Div. 2, with prizes from NEAR!)
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bitmasks

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Problems

#	Name
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x4046
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x11184
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5261
1979B	XOR Sequences bitmasks, greedy	1000	x19441
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x15496
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12196
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5765
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x3990
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x16348
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3490
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3812
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x8217
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4265
1944B	Equal XOR bitmasks, constructive algorithms	1100	x15053
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6832
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10756
1926D	Vlad and Division bitmasks, greedy	1300	x14331
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7252
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x13049
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x39737
1915A	Odd One Out bitmasks, implementation	800	x51861
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x14107
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2152
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x14854
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x5274
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x11800
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3854
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x5705
1883E	Look Back bitmasks, greedy	1700	x7402
1882D	Tree XOR bitmasks, dfs and similar, dp, greedy, trees	1900	x5120
1882B	Sets and Union bitmasks, brute force, constructive algorithms, greedy	1300	x14748
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6893
1878E	Iva & Pav binary search, bitmasks, data structures, greedy	1400	x11674
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x11112
1872E	Data Structures Fan binary search, bitmasks, data structures, dp	1500	x12523
1870B	Friendly Arrays bitmasks, greedy, math	1200	x13671
1868B1	Candy Party (Easy Version) bitmasks, constructive algorithms, graphs, greedy, implementation, math	1700	x6643
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16220
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12914
1862F	Magic Will Save the World binary search, bitmasks, brute force, dp	1800	x5849
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5485
1847C	Vampiric Powers, anyone? bitmasks, brute force, dp, greedy	1400	x12422
1847B	Hamon Odyssey bitmasks, greedy, two pointers	1000	x19408
1846G	Rudolf and CodeVid-23 bitmasks, dp, graphs, greedy, shortest paths	1900	x4171
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x31725
1842B	Tenzing and Books bitmasks, greedy, math	1100	x16142
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21860
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7300
1829C	Mr. Perfectly Fine bitmasks, greedy, implementation	800	x27622
1807G2	Subsequence Addition (Hard Version) bitmasks, dp, greedy, implementation, sortings	1100	x18165
1805A	We Need the Zero bitmasks, brute force	800	x21766
1801A	The Very Beautiful Blanket bitmasks, constructive algorithms	1600	x8264
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3759
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x5998
1790E	Vlad and a Pair of Numbers bitmasks, constructive algorithms	1400	x14513
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4735
1778C	Flexible String bitmasks, brute force, strings	1600	x7844
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3296
1775C	Interesting Sequence bitmasks, math	1600	x9931
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x13026
1763A	Absolute Maximization bitmasks, constructive algorithms, greedy, math	800	x15452
1760G	SlavicG's Favorite Problem bitmasks, dfs and similar, graphs	1700	x7057
1747D	Yet Another Problem binary search, bitmasks, constructive algorithms, data structures	1900	x4545
1742G	Orray bitmasks, brute force, greedy, math, sortings	1500	x10185
1732C1	Sheikh (Easy version) binary search, bitmasks, greedy, two pointers	1800	x5669
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9165
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x14823
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x10703
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x6416
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x5796
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x4993
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10239
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19328
1698A	XOR Mixup bitmasks, brute force	800	x28221
1696A	NIT orz! bitmasks, greedy	800	x18470
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x17988
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21080
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x17656
1680E	Moving Chips bitmasks, dp, greedy	2000	x3672
1669H	Maximal AND bitmasks, greedy, math	1300	x17098
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3763
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17221
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10718
1658D1	388535 (Easy Version) bitmasks, math	1600	x8887
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x13522
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6082
1635A	Min Or Sum bitmasks, greedy	800	x22444
1634B	Fortune Telling bitmasks, math	1400	x15967
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12401
1632B	Roof Construction bitmasks, constructive algorithms	1000	x21360
1630A	And Matching bitmasks, constructive algorithms	1500	x14227
1625A	Ancient Civilization bitmasks, greedy, math	800	x17045
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5693
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4088
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15412
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10026
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13647
1600J	Robot Factory bitmasks, dfs and similar	1400	x3816
1594B	Special Numbers bitmasks, math	1100	x19422
1592C	Bakry and Partitioning bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees	1700	x7721

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