Problemset - Codeforces

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Codeforces Round (Div. 2)
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bitmasks

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Problems

#	Name
1795G	Removal Sequences bitmasks, dfs and similar, graphs	2700	x663
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x6031
1790E	Vlad and a Pair of Numbers bitmasks, constructive algorithms	1400	x14622
1789F	Serval and Brain Power bitmasks, brute force, dp, greedy, implementation, strings	2700	x540
1789D	Serval and Shift-Shift-Shift bitmasks, brute force, constructive algorithms, implementation	2200	x1618
1788F	XOR, Tree, and Queries bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees	2500	x809
1787E	The Harmonization of XOR bitmasks, constructive algorithms, greedy, math	2100	x2253
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1412
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4775
1779F	Xorcerer's Stones bitmasks, constructive algorithms, dp, trees	2500	x1233
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x844
1778C	Flexible String bitmasks, brute force, strings	1600	x7915
1777F	Comfortably Numb bitmasks, data structures, divide and conquer, strings, trees	2400	x854
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3356
1775C	Interesting Sequence bitmasks, math	1600	x10028
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x13186
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x346
1771F	Hossam and Range Minimum Query binary search, bitmasks, data structures, hashing, probabilities, strings, trees	2500	x1029
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x638
1767E	Algebra Flash bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees	2500	x870
1765A	Access Levels bitmasks, dsu, flows, graph matchings	2400	x673
1763A	Absolute Maximization bitmasks, constructive algorithms, greedy, math	800	x15522
1760G	SlavicG's Favorite Problem bitmasks, dfs and similar, graphs	1700	x7125
1748F	Circular Xor Reversal bitmasks, constructive algorithms	3000	x328
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2718
1747D	Yet Another Problem binary search, bitmasks, constructive algorithms, data structures	1900	x4566
1743G	Antifibonacci Cut bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math	3000	x249
1742G	Orray bitmasks, brute force, greedy, math, sortings	1500	x10292
1741G	Kirill and Company bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths	2200	x1453
1739F	Keyboard Design bitmasks, data structures, dp, string suffix structures, strings	2600	x517
1739E	Cleaning Robot bitmasks, dp	2400	x1194
1734F	Zeros and Ones bitmasks, divide and conquer, dp, math	2500	x778
1732C2	Sheikh (Hard Version) binary search, bitmasks, brute force, greedy, implementation, two pointers	2100	x2496
1732C1	Sheikh (Easy version) binary search, bitmasks, greedy, two pointers	1800	x5705
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9217
1730F	Almost Sorted bitmasks, data structures, dp	2700	x426
1728G	Illumination binary search, bitmasks, brute force, combinatorics, dp, math, two pointers	2700	x440
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x14888
1725F	Field Photography bitmasks, data structures, sortings	2100	x950
1725D	Deducing Sortability binary search, bitmasks, math	2900	x119
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x10825
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x6475
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x1778
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x5837
1716E	Swap and Maximum Block bitmasks, data structures, dfs and similar, divide and conquer, dp	2500	x1036
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x5026
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x521
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1302
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x538
1709E	XOR Tree bitmasks, data structures, dfs and similar, dsu, greedy, trees	2400	x2516
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x146
1705F	Mark and the Online Exam bitmasks, constructive algorithms, interactive, probabilities	2900	x588
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x2028
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10323
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19403
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x308
1698A	XOR Mixup bitmasks, brute force	800	x28404
1696A	NIT orz! bitmasks, greedy	800	x18530
1689E	ANDfinity bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2500	x1173
1688B	Patchouli's Magical Talisman bitmasks, constructive algorithms, greedy, sortings	800	x18028
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21167
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x17862
1680E	Moving Chips bitmasks, dp, greedy	2000	x3684
1679F	Formalism for Formalism bitmasks, dp, math	2600	x513
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1122
1673F	Anti-Theft Road Planning bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math	2400	x786
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x688
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x939
1670E	Hemose on the Tree bitmasks, constructive algorithms, dfs and similar, trees	2200	x1705
1669H	Maximal AND bitmasks, greedy, math	1300	x17401
1665E	MinimizOR bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers	2500	x1475
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3785
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17328
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1493
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10761
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2471
1658D1	388535 (Easy Version) bitmasks, math	1600	x8913
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1089
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x13626
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1070
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6119
1635A	Min Or Sum bitmasks, greedy	800	x22582
1634B	Fortune Telling bitmasks, math	1400	x16076
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12480
1632B	Roof Construction bitmasks, constructive algorithms	1000	x21540
1630A	And Matching bitmasks, constructive algorithms	1500	x14297
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2006
1625A	Ancient Civilization bitmasks, greedy, math	800	x17073
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5744
1622E	Math Test bitmasks, brute force, greedy	2200	x1863
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x870
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4110
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x815
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x1856
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15512
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10064
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x1966
1605D	Treelabeling bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees	2100	x2866
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13914
1600J	Robot Factory bitmasks, dfs and similar	1400	x3831