Problemset - Codeforces

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Codeforces Round (Div. 3)
6 days

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Problems

#	Name
1984H	Tower Capturing combinatorics, dp, geometry	3300	x99
1984F	Reconstruction brute force, dp, math	2500	x630
1984E	Shuffle dp, greedy, trees	2400	x979
1981F	Turtle and Paths on a Tree data structures, dp, trees	3000	x165
1976F	Remove Bridges data structures, dfs and similar, dp, greedy, sortings, trees	2800	x378
1975I	Mind Bloom dp	3500	x42
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x624
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x161
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x246
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x419
1970E3	Trails (Hard) dp, matrices	2200	x472
1970E2	Trails (Medium) dp, matrices	2000	x858
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x166
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x1088
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1600
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x77
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x159
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1429
1958H	Composite Spells *special problem, dp	2600	x67
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1080
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3457
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1105
1954F	Unique Strings combinatorics, dp, math	3100	x226
1951H	Thanos Snap binary search, dp, games, greedy, trees	3200	x226
1949A	Grove brute force, dfs and similar, dp, geometry, probabilities	3300	x91
1946F	Nobody is needed 2-sat, data structures, dfs and similar, dp	2500	x810
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2199
1943F	Minimum Hamming Distance dp	3500	x88
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x638
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1309
1942H	Farmer John's Favorite Intern data structures, dp, flows, trees	3500	x72
1942G	Bessie and Cards combinatorics, dp, math	2800	x396
1942D	Learning to Paint binary search, data structures, dfs and similar, dp, greedy, implementation, sortings	2100	x2539
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2272
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x313
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1030
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2441
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1551
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1592
1927G	Paint Charges data structures, dp, greedy, math	2300	x1531
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1550
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x135
1924D	Balanced Subsequences combinatorics, dp, math	2700	x798
1923E	Count Paths data structures, dfs and similar, dp, dsu, graphs, trees	2000	x3332
1922F	Replace on Segment dp, graph matchings	2500	x1192
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1163
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2435
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x758
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x790
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x916
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1691
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x508
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x589
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x140
1914G2	Light Bulbs (Hard Version) combinatorics, data structures, dfs and similar, dp, graphs, hashing	2300	x1246
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1711
1913D	Array Collapse data structures, divide and conquer, dp, trees	2100	x2789
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x46
1910E	Maximum Sum Subarrays *special problem, dp	2100	x183
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x847
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1666
1906J	Count BFS Graph combinatorics, dp	2100	x675
1906H	Twin Friends combinatorics, dp	2200	x625
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x880
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x721
1901E	Compressed Tree dfs and similar, dp, graphs, greedy, sortings, trees	2200	x1411
1900E	Transitive Graph dfs and similar, dp, dsu, graphs, implementation	2100	x1874
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3829
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x96
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x84
1895G	Two Characters, Two Colors binary search, data structures, dp, flows, greedy	3100	x179
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x647
1895E	Infinite Card Game binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers	2300	x1474
1893E	Cacti Symphony combinatorics, dfs and similar, dp, graphs	3500	x182
1889F	Doremy's Average Tree data structures, dp, greedy, trees	3500	x70
1889C2	Doremy's Drying Plan (Hard Version) data structures, dp	2600	x907
1889C1	Doremy's Drying Plan (Easy Version) brute force, data structures, dp, greedy, sortings	2000	x3075
1886E	I Wanna be the Team Leader bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers	2400	x1362
1884D	Counting Rhyme dp, math, number theory	2100	x2935
1876E	Ball-Stackable constructive algorithms, data structures, dp, trees	3300	x258
1874G	Jellyfish and Inscryption dp	3500	x78
1874F	Jellyfish and OEIS dp	3500	x190
1874E	Jellyfish and Hack dp, math	3000	x282
1874D	Jellyfish and Miku divide and conquer, dp, math, probabilities	2800	x668
1874C	Jellyfish and EVA dp, graphs, greedy, math, probabilities	2300	x1535
1874B	Jellyfish and Math bitmasks, brute force, dfs and similar, dp, graphs, shortest paths	2400	x1086
1870E	Another MEX Problem bitmasks, brute force, dp, shortest paths	2300	x2239
1868E	Min-Sum-Max constructive algorithms, dp, greedy	3500	x74
1868C	Travel Plan combinatorics, dp, implementation, math, trees	2400	x1098
1868B2	Candy Party (Hard Version) bitmasks, constructive algorithms, dp, greedy, implementation, math	2100	x2299
1866M	Mighty Rock Tower brute force, combinatorics, dp, math, probabilities	2400	x700
1866K	Keen Tree Calculation binary search, data structures, dp, geometry, graphs, implementation, trees	2500	x415
1866J	Jackets and Packets dp	2800	x271
1866I	Imagination Castle dp, games, two pointers	2300	x683
1866G	Grouped Carriages binary search, data structures, dp, flows, greedy	2100	x1538
1866E	Elevators of Tamem dp	2700	x279
1866D	Digital Wallet dp, greedy	2300	x1213
1864H	Asterism Stream dp, math, matrices	3200	x274
1863I	Redundant Routes constructive algorithms, dp, trees	3500	x71
1863H	Goldberg Machine 3 dp, trees	3500	x73

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