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	x4028
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x11153
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5242
1979B	XOR Sequences bitmasks, greedy	1000	x19389
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x15475
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12180
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5762
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x3988
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x16338
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3488
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3810
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x8212
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4262
1944B	Equal XOR bitmasks, constructive algorithms	1100	x15045
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6824
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10748
1926D	Vlad and Division bitmasks, greedy	1300	x14322
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7251
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x13044
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x39724
1915A	Odd One Out bitmasks, implementation	800	x51835
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x14103
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2150
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x14838
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x5271
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x11797
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	x7397
1882D	Tree XOR bitmasks, dfs and similar, dp, greedy, trees	1900	x5116
1882B	Sets and Union bitmasks, brute force, constructive algorithms, greedy	1300	x14742
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6892
1878E	Iva & Pav binary search, bitmasks, data structures, greedy	1400	x11669
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x11108
1872E	Data Structures Fan binary search, bitmasks, data structures, dp	1500	x12519
1870B	Friendly Arrays bitmasks, greedy, math	1200	x13667
1868B1	Candy Party (Easy Version) bitmasks, constructive algorithms, graphs, greedy, implementation, math	1700	x6637
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16218
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12913
1862F	Magic Will Save the World binary search, bitmasks, brute force, dp	1800	x5848
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5485
1847C	Vampiric Powers, anyone? bitmasks, brute force, dp, greedy	1400	x12420
1847B	Hamon Odyssey bitmasks, greedy, two pointers	1000	x19405
1846G	Rudolf and CodeVid-23 bitmasks, dp, graphs, greedy, shortest paths	1900	x4171
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x31714
1842B	Tenzing and Books bitmasks, greedy, math	1100	x16135
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21855
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7300
1829C	Mr. Perfectly Fine bitmasks, greedy, implementation	800	x27620
1807G2	Subsequence Addition (Hard Version) bitmasks, dp, greedy, implementation, sortings	1100	x18162
1805A	We Need the Zero bitmasks, brute force	800	x21763
1801A	The Very Beautiful Blanket bitmasks, constructive algorithms	1600	x8263
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3758
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	x14511
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4735
1778C	Flexible String bitmasks, brute force, strings	1600	x7839
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3295
1775C	Interesting Sequence bitmasks, math	1600	x9924
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x13019
1763A	Absolute Maximization bitmasks, constructive algorithms, greedy, math	800	x15449
1760G	SlavicG's Favorite Problem bitmasks, dfs and similar, graphs	1700	x7055
1747D	Yet Another Problem binary search, bitmasks, constructive algorithms, data structures	1900	x4545
1742G	Orray bitmasks, brute force, greedy, math, sortings	1500	x10182
1732C1	Sheikh (Easy version) binary search, bitmasks, greedy, two pointers	1800	x5668
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9163
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x14822
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x10697
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	x5794
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x4993
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10232
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19327
1698A	XOR Mixup bitmasks, brute force	800	x28201
1696A	NIT orz! bitmasks, greedy	800	x18469
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x17987
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21078
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x17650
1680E	Moving Chips bitmasks, dp, greedy	2000	x3672
1669H	Maximal AND bitmasks, greedy, math	1300	x17086
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3762
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17210
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	x13520
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6082
1635A	Min Or Sum bitmasks, greedy	800	x22439
1634B	Fortune Telling bitmasks, math	1400	x15963
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12399
1632B	Roof Construction bitmasks, constructive algorithms	1000	x21353
1630A	And Matching bitmasks, constructive algorithms	1500	x14226
1625A	Ancient Civilization bitmasks, greedy, math	800	x17045
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5691
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4086
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15409
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10025
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13641
1600J	Robot Factory bitmasks, dfs and similar	1400	x3815
1594B	Special Numbers bitmasks, math	1100	x19419
1592C	Bakry and Partitioning bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees	1700	x7720

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