Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 2)
5 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

bitmasks

Add tag

Problems

#	Name
1790E	Vlad and a Pair of Numbers bitmasks, constructive algorithms	1400	x14552
1789F	Serval and Brain Power bitmasks, brute force, dp, greedy, implementation, strings	2700	x528
1789D	Serval and Shift-Shift-Shift bitmasks, brute force, constructive algorithms, implementation	2200	x1610
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	x2226
1780F	Three Chairs bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings	2300	x1410
1780D	Bit Guessing Game binary search, bitmasks, constructive algorithms, interactive	1800	x4756
1779F	Xorcerer's Stones bitmasks, constructive algorithms, dp, trees	2500	x1228
1778E	The Tree Has Fallen! bitmasks, dfs and similar, math, trees	2500	x840
1778C	Flexible String bitmasks, brute force, strings	1600	x7879
1777F	Comfortably Numb bitmasks, data structures, divide and conquer, strings, trees	2400	x843
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3308
1775C	Interesting Sequence bitmasks, math	1600	x9972
1775B	Gardener and the Array bitmasks, constructive algorithms	1300	x13098
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x326
1771F	Hossam and Range Minimum Query binary search, bitmasks, data structures, hashing, probabilities, strings, trees	2500	x999
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x631
1767E	Algebra Flash bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees	2500	x863
1765A	Access Levels bitmasks, dsu, flows, graph matchings	2400	x671
1763A	Absolute Maximization bitmasks, constructive algorithms, greedy, math	800	x15489
1760G	SlavicG's Favorite Problem bitmasks, dfs and similar, graphs	1700	x7083
1748F	Circular Xor Reversal bitmasks, constructive algorithms	3000	x328
1748D	ConstructOR bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory	2100	x2707
1747D	Yet Another Problem binary search, bitmasks, constructive algorithms, data structures	1900	x4560
1743G	Antifibonacci Cut bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math	3000	x248
1742G	Orray bitmasks, brute force, greedy, math, sortings	1500	x10240
1741G	Kirill and Company bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths	2200	x1447
1739F	Keyboard Design bitmasks, data structures, dp, string suffix structures, strings	2600	x517
1739E	Cleaning Robot bitmasks, dp	2400	x1189
1734F	Zeros and Ones bitmasks, divide and conquer, dp, math	2500	x777
1732C2	Sheikh (Hard Version) binary search, bitmasks, brute force, greedy, implementation, two pointers	2100	x2489
1732C1	Sheikh (Easy version) binary search, bitmasks, greedy, two pointers	1800	x5681
1731C	Even Subarrays bitmasks, brute force, hashing, math, number theory	1700	x9190
1730F	Almost Sorted bitmasks, data structures, dp	2700	x422
1728G	Illumination binary search, bitmasks, brute force, combinatorics, dp, math, two pointers	2700	x435
1726B	Mainak and Interesting Sequence bitmasks, constructive algorithms, math	1100	x14852
1725F	Field Photography bitmasks, data structures, sortings	2100	x949
1725D	Deducing Sortability binary search, bitmasks, math	2900	x119
1722G	Even-Odd XOR bitmasks, constructive algorithms, greedy	1500	x10763
1721D	Maximum AND bitmasks, dfs and similar, divide and conquer, greedy, sortings	1800	x6445
1720D2	Xor-Subsequence (hard version) bitmasks, data structures, dp, strings, trees	2400	x1772
1720D1	Xor-Subsequence (easy version) bitmasks, brute force, dp, strings, trees, two pointers	1800	x5818
1716E	Swap and Maximum Block bitmasks, data structures, dfs and similar, divide and conquer, dp	2500	x1032
1715D	2+ doors 2-sat, bitmasks, graphs, greedy	1900	x5009
1713F	Lost Array bitmasks, combinatorics, constructive algorithms, dp, math	2900	x520
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1297
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	x2505
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x146
1705F	Mark and the Online Exam bitmasks, constructive algorithms, interactive, probabilities	2900	x587
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x2002
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x10276
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x19368
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x308
1698A	XOR Mixup bitmasks, brute force	800	x28317
1696A	NIT orz! bitmasks, greedy	800	x18497
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	x18000
1688A	Cirno's Perfect Bitmasks Classroom bitmasks, brute force	800	x21118
1682B	AND Sorting bitmasks, constructive algorithms, sortings	1100	x17748
1680E	Moving Chips bitmasks, dp, greedy	2000	x3676
1679F	Formalism for Formalism bitmasks, dp, math	2600	x510
1679E	Typical Party in Dorm bitmasks, combinatorics, dp, strings	2400	x1117
1673F	Anti-Theft Road Planning bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math	2400	x781
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x683
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x935
1670E	Hemose on the Tree bitmasks, constructive algorithms, dfs and similar, trees	2200	x1700
1669H	Maximal AND bitmasks, greedy, math	1300	x17235
1665E	MinimizOR bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers	2500	x1454
1665D	GCD Guess bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory	2000	x3770
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x17282
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1489
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x10737
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x2464
1658D1	388535 (Easy Version) bitmasks, math	1600	x8896
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1072
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x13568
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1068
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6105
1635A	Min Or Sum bitmasks, greedy	800	x22492
1634B	Fortune Telling bitmasks, math	1400	x16022
1632C	Strange Test binary search, bitmasks, brute force, dp, math	1600	x12440
1632B	Roof Construction bitmasks, constructive algorithms	1000	x21442
1630A	And Matching bitmasks, constructive algorithms	1500	x14247
1625D	Binary Spiders bitmasks, data structures, implementation, math, sortings, trees	2300	x2002
1625A	Ancient Civilization bitmasks, greedy, math	800	x17056
1624G	MinOr Tree bitmasks, dfs and similar, dsu, graphs, greedy	1900	x5714
1622E	Math Test bitmasks, brute force, greedy	2200	x1859
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x868
1618F	Reverse bitmasks, constructive algorithms, dfs and similar, implementation, math, strings	2000	x4095
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x812
1615D	X(or)-mas Tree bitmasks, dfs and similar, dsu, graphs, trees	2200	x1852
1615B	And It's Non-Zero bitmasks, greedy, math	1300	x15450
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10043
1609E	William The Oblivious bitmasks, data structures, dp, matrices	2400	x1894
1605D	Treelabeling bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees	2100	x2861
1601A	Array Elimination bitmasks, greedy, math, number theory	1300	x13709
1600J	Robot Factory bitmasks, dfs and similar	1400	x3825
1599J	Bob's Beautiful Array bitmasks, brute force, greedy	2600	x286
1598F	RBS binary search, bitmasks, brute force, data structures, dp	2400	x1336