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
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1061
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x4215
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x11593
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x934
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5437
1979B	XOR Sequences bitmasks, greedy	1000	x19908
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x1519
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x15797
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x669
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x175
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12407
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x254
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1469
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5835
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x4028
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x16525
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3518
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1123
1952I	Dark Matter bitmasks, geometry		x404
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3863
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x8279
1948G	MST with Matching bitmasks, brute force, dsu, graph matchings, trees	3100	x655
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4292
1944B	Equal XOR bitmasks, constructive algorithms	1100	x15173
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x449
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6884
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1227
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1255
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3222
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x911
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x655
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2458
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1566
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1572
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10853
1926D	Vlad and Division bitmasks, greedy	1300	x14423
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7283
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x13112
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x919
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x39910
1915A	Odd One Out bitmasks, implementation	800	x52280
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x14197
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2169
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1289
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x15041
1906B	Button Pressing bitmasks, constructive algorithms, hashing	2600	x467
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x730
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x5303
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x11907
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3880
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x5724
1886E	I Wanna be the Team Leader bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers	2400	x1372
1883E	Look Back bitmasks, greedy	1700	x7448
1882D	Tree XOR bitmasks, dfs and similar, dp, greedy, trees	1900	x5135
1882B	Sets and Union bitmasks, brute force, constructive algorithms, greedy	1300	x14823
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6933
1878G	wxhtzdy ORO Tree binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees	2300	x1129
1878E	Iva & Pav binary search, bitmasks, data structures, greedy	1400	x11750
1875C	Jellyfish and Green Apple bitmasks, greedy, math, number theory	1400	x11169
1874B	Jellyfish and Math bitmasks, brute force, dfs and similar, dp, graphs, shortest paths	2400	x1097
1872E	Data Structures Fan binary search, bitmasks, data structures, dp	1500	x12598
1870E	Another MEX Problem bitmasks, brute force, dp, shortest paths	2300	x2259
1870B	Friendly Arrays bitmasks, greedy, math	1200	x13727
1868B2	Candy Party (Hard Version) bitmasks, constructive algorithms, dp, greedy, implementation, math	2100	x2322
1868B1	Candy Party (Easy Version) bitmasks, constructive algorithms, graphs, greedy, implementation, math	1700	x6671
1867B	XOR Palindromes bitmasks, constructive algorithms, strings	1100	x16274
1864E	Guess Game bitmasks, data structures, games, math, probabilities, sortings, strings, trees	2100	x2504
1864C	Divisor Chain bitmasks, constructive algorithms, math, number theory	1300	x12973
1863F	Divide, XOR, and Conquer bitmasks, dp, math	2600	x1055
1862F	Magic Will Save the World binary search, bitmasks, brute force, dp	1800	x5876
1861F	Four Suits binary search, bitmasks, flows, greedy	3200	x188
1856E2	PermuTree (hard version) bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees	2700	x1335
1854B	Earn or Unlock bitmasks, brute force, dp	2200	x3410
1851F	Lisa and the Martians bitmasks, greedy, math, strings, trees	1800	x5508
1849F	XOR Partition binary search, bitmasks, data structures, divide and conquer, greedy, trees	2700	x680
1848F	Vika and Wiki binary search, bitmasks, combinatorics, divide and conquer, dp, math	2400	x1486
1847F	The Boss's Identity binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings	2500	x865
1847C	Vampiric Powers, anyone? bitmasks, brute force, dp, greedy	1400	x12461
1847B	Hamon Odyssey bitmasks, greedy, two pointers	1000	x19470
1846G	Rudolf and CodeVid-23 bitmasks, dp, graphs, greedy, shortest paths	1900	x4185
1844G	Tree Weights bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees	3000	x673
1843C	Sum in Binary Tree bitmasks, combinatorics, math, trees	800	x31849
1842H	Tenzing and Random Real Numbers bitmasks, dp, graphs, math, probabilities	3000	x581
1842B	Tenzing and Books bitmasks, greedy, math	1100	x16244
1840B	Binary Cafe bitmasks, combinatorics, math	1100	x21916
1835F	Good Graph bitmasks, dfs and similar, graph matchings, graphs, implementation	3500	x157
1835C	Twin Clusters bitmasks, brute force, constructive algorithms, math, probabilities	2600	x950
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x7334
1829C	Mr. Perfectly Fine bitmasks, greedy, implementation	800	x27695
1826E	Walk the Runway bitmasks, brute force, data structures, dp, graphs, implementation, sortings	2400	x1531
1815D	XOR Counting bitmasks, combinatorics, dp, math	2600	x1076
1807G2	Subsequence Addition (Hard Version) bitmasks, dp, greedy, implementation, sortings	1100	x18242
1805A	We Need the Zero bitmasks, brute force	800	x21909
1804H	Code Lock bitmasks, dp	3300	x171
1804E	Routing bitmasks, brute force, dfs and similar, dp, graphs	2400	x1381
1801A	The Very Beautiful Blanket bitmasks, constructive algorithms	1600	x8290
1800F	Dasha and Nightmares bitmasks, hashing, meet-in-the-middle, strings	1900	x3769
1799H	Tree Cutting bitmasks, dfs and similar, dp	3200	x275
1795G	Removal Sequences bitmasks, dfs and similar, graphs	2700	x660
1792D	Fixed Prefix Permutations binary search, bitmasks, data structures, hashing, math, sortings	1700	x6014

←