Problemset - Codeforces

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Codeforces Round 950 (Div. 3)
43:11:31
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bitmasks

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Problems

#	Name
1787E	The Harmonization of XOR bitmasks, constructive algorithms, greedy, math	2100	x2198
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1396
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4691
1779F	Xorcerer's Stones bitmasks, constructive algorithms, dp, trees	2500	x1225
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x827
1778C	Flexible String bitmasks, brute force, strings	1600	x7746
1777F	Comfortably Numb bitmasks, data structures, divide and conquer, strings, trees	2400	x826
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3250
1775C	Interesting Sequence bitmasks, math	1600	x9770
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x12750
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x324
1771F	Hossam and Range Minimum Query binary search, bitmasks, data structures, hashing, probabilities, strings, trees	2500	x979
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x622
1767E	Algebra Flash bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees	2500	x847
1765A	Access Levels bitmasks, dsu, flows, graph matchings	2400	x669
1763A	Absolute Maximization bitmasks, constructive algorithms, greedy, math	800	x15359
1760G	SlavicG's Favorite Problem bitmasks, dfs and similar, graphs	1700	x6975
1748F	Circular Xor Reversal bitmasks, constructive algorithms	3000	x326
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2685
1747D	Yet Another Problem binary search, bitmasks, constructive algorithms, data structures	1900	x4515
1743G	Antifibonacci Cut bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math	3000	x247
1742G	Orray bitmasks, brute force, greedy, math, sortings	1500	x10011
1741G	Kirill and Company bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths	2200	x1437
1739F	Keyboard Design bitmasks, data structures, dp, string suffix structures, strings	2600	x516
1739E	Cleaning Robot bitmasks, dp	2400	x1180
1734F	Zeros and Ones bitmasks, divide and conquer, dp, math	2500	x775
1732C2	Sheikh (Hard Version) binary search, bitmasks, brute force, greedy, implementation, two pointers	2100	x2474
1732C1	Sheikh (Easy version) binary search, bitmasks, greedy, two pointers	1800	x5616
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9046
1730F	Almost Sorted bitmasks, data structures, dp	2700	x413
1728G	Illumination binary search, bitmasks, brute force, combinatorics, dp, math, two pointers	2700	x429
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x14725
1725F	Field Photography bitmasks, data structures, sortings	2100	x942
1725D	Deducing Sortability binary search, bitmasks, math	2900	x119
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x10524
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x6360
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x1759
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x5763
1716E	Swap and Maximum Block bitmasks, data structures, dfs and similar, divide and conquer, dp	2500	x1027
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x4959
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x514
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1284
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x537
1709E	XOR Tree bitmasks, data structures, dfs and similar, dsu, greedy, trees	2400	x2481
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x146
1705F	Mark and the Online Exam bitmasks, constructive algorithms, interactive, probabilities	2900	x577
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x1983
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10113
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19238
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x303
1698A	XOR Mixup bitmasks, brute force	800	x28013
1696A	NIT orz! bitmasks, greedy	800	x18393
1689E	ANDfinity bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2500	x1155
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x17914
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x20933
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x17426
1680E	Moving Chips bitmasks, dp, greedy	2000	x3649
1679F	Formalism for Formalism bitmasks, dp, math	2600	x502
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1105
1673F	Anti-Theft Road Planning bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math	2400	x776
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x665
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x923
1670E	Hemose on the Tree bitmasks, constructive algorithms, dfs and similar, trees	2200	x1688
1669H	Maximal AND bitmasks, greedy, math	1300	x16712
1665E	MinimizOR bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers	2500	x1430
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3730
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17094
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1473
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10672
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2451
1658D1	388535 (Easy Version) bitmasks, math	1600	x8810
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1061
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x13346
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1053
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6038
1635A	Min Or Sum bitmasks, greedy	800	x22267
1634B	Fortune Telling bitmasks, math	1400	x15799
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12325
1632B	Roof Construction bitmasks, constructive algorithms	1000	x21072
1630A	And Matching bitmasks, constructive algorithms	1500	x14143
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x1976
1625A	Ancient Civilization bitmasks, greedy, math	800	x16992
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5601
1622E	Math Test bitmasks, brute force, greedy	2200	x1848
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x863
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4066
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x803
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x1846
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15303
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x9962
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x1885
1605D	Treelabeling bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees	2100	x2847
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13429
1600J	Robot Factory bitmasks, dfs and similar	1400	x3794
1599J	Bob's Beautiful Array bitmasks, brute force, greedy	2600	x285
1598F	RBS binary search, bitmasks, brute force, data structures, dp	2400	x1331
1594B	Special Numbers bitmasks, math	1100	x19257
1592E	Bored Bakry bitmasks, greedy, math, two pointers	2400	x1550
1592C	Bakry and Partitioning bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees	1700	x7662
1584F	Strange LCS bitmasks, dp, graphs, greedy, strings	2600	x856