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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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bitmasks

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Problems

#	Name
2066C	Bitwise Slides bitmasks, combinatorics, dp, math	2300	x2523
2064D	Eating binary search, bitmasks, brute force, data structures, dp, greedy, trees, two pointers	1900	x5873
2062H	Galaxy Generator bitmasks, combinatorics, dp	3500	x174
2061E	Kevin and And bitmasks, brute force, dp, greedy, math, sortings	2000	x3992
2061D	Kevin and Numbers bitmasks, data structures	1600	x10777
2057C	Trip to the Olympiad bitmasks, constructive algorithms, greedy, math	1500	x13794
2056F2	Xor of Median (Hard Version) bitmasks, brute force, combinatorics, dp, math	3000	x354
2056F1	Xor of Median (Easy Version) bitmasks, brute force, combinatorics, dp, math	2700	x447
2053C	Bewitching Stargazer bitmasks, divide and conquer, dp, math	1500	x12330
2051G	Snakes bitmasks, dp, dsu, graphs	2100	x2428
2049F	MEX OR Mania bitmasks, brute force, data structures, dsu, implementation	2700	x581
2049E	Broken Queries binary search, bitmasks, brute force, constructive algorithms, implementation, interactive	2400	x1591
2048I2	Kevin and Puzzle (Hard Version) bitmasks, fft, math	3500	x57
2048C	Kevin and Binary Strings bitmasks, brute force, greedy, implementation, strings	1200	x15138
2045J	Xorderable Array bitmasks, data structures	2600	x341
2043F	Nim bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths	2700	x906
2043E	Matrix Transformation bitmasks, brute force, data structures, dfs and similar, graphs, greedy, implementation	2300	x1825
2041C	Cube bitmasks, dfs and similar, dp	2000	x2011
2040C	Ordered Permutations bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers	1600	x10775
2039C2	Shohag Loves XOR (Hard Version) bitmasks, brute force, math, number theory	1800	x4969
2039C1	Shohag Loves XOR (Easy Version) bitmasks, brute force, math, number theory	1200	x13513
2038D	Divide OR Conquer binary search, bitmasks, data structures, dp, implementation	2400	x854
2037G	Natlan Exploring bitmasks, combinatorics, data structures, dp, math, number theory	2000	x3727
2036F	XORificator 3000 bitmasks, dp, number theory, two pointers	1900	x5257
2035C	Alya and Permutation bitmasks, constructive algorithms, math	1400	x11525
2029H	Message Spread bitmasks, brute force, combinatorics, dp	3500	x111
2028F	Alice's Adventures in Addition bitmasks, brute force, dp, implementation	2700	x541
2027E2	Bit Game (Hard Version) bitmasks, dp, math	3100	x110
2027E1	Bit Game (Easy Version) bitmasks, brute force, games, math	2800	x248
2026E	Best Subsequence bitmasks, dfs and similar, flows, graph matchings, graphs	2500	x2012
2020E	Expected Power bitmasks, dp, math, probabilities	2000	x3984
2020C	Bitwise Balancing bitmasks, hashing, implementation, math, schedules, ternary search	1400	x18289
2020A	Find Minimum Operations bitmasks, brute force, greedy, math, number theory	800	x25935
2009F	Firefly's Queries bitmasks, data structures, flows, math	1700	x8485
2002G	Lattice Optimizing bitmasks, brute force, hashing, meet-in-the-middle	3400	x283
1995D	Cases bitmasks, brute force, dp, strings	2300	x2888
1994G	Minecraft bitmasks, brute force, dp, graphs, math	2600	x1627
1994E	Wooden Game bitmasks, greedy, math, trees	2000	x5486
1994B	Fun Game bitmasks, constructive algorithms, greedy, math	1100	x19485
1993E	Xor-Grid Problem bitmasks, constructive algorithms, dp, implementation	2700	x729
1991H	Prime Split Game bitmasks, dp, fft, games, math, number theory	3300	x559
1991D	Prime XOR Coloring bitmasks, constructive algorithms, graphs, greedy, math, number theory	1900	x7886
1991B	AND Reconstruction bitmasks, constructive algorithms, greedy	1100	x18900
1990D	Grid Puzzle bitmasks, brute force, dp, greedy, implementation	1800	x7713
1988C	Increasing Sequence with Fixed OR bitmasks, constructive algorithms, greedy	1300	x20288
1983G	Your Loss bitmasks, brute force, dp, trees	3000	x285
1983F	array-value binary search, bitmasks, data structures, greedy, two pointers	2500	x1523
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1905
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x6339
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x16419
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1701
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x7850
1979B	XOR Sequences bitmasks, greedy	1000	x26420
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x2346
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x19894
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x1036
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x320
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x16817
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x546
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x2238
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x8118
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x5809
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x20399
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x4779
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1519
1952I	Dark Matter *special problem, bitmasks, geometry		x649
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x6071
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x11273
1948G	MST with Matching bitmasks, brute force, dsu, graph matchings, trees	3100	x874
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x5605
1944B	Equal XOR bitmasks, constructive algorithms	1100	x18158
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x625
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x8660
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1650
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1761
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x4137
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x1183
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x937
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x3049
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x2078
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x2092
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x14840
1926D	Vlad and Division bitmasks, greedy	1300	x18363
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x9086
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x16651
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x1196
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x50328
1915A	Odd One Out bitmasks, implementation	800	x79739
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x17490
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x4194
1909E	Multiple Lamps bitmasks, brute force, constructive algorithms, math, number theory	2400	x1678
1909B	Make Almost Equal With Mod bitmasks, constructive algorithms, math, number theory	1200	x30915
1906B	Button Pressing bitmasks, constructive algorithms, hashing	2600	x828
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x1026
1903D1	Maximum And Queries (easy version) binary search, bitmasks, brute force, greedy	1700	x7138
1903B	StORage room bitmasks, brute force, constructive algorithms, greedy	1200	x14829
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x5352
1895D	XOR Construction bitmasks, constructive algorithms, data structures, math, string suffix structures, trees	1900	x7128
1886E	I Wanna be the Team Leader bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers	2400	x1852
1883E	Look Back bitmasks, greedy	1700	x9916

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