Problemset - Codeforces

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Codeforces Round 945 (Div. 2)
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Problems

#	Name
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x160
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x294
1970E3	Trails (Hard) dp, matrices	2200	x344
1970E2	Trails (Medium) dp, matrices	2000	x563
1970E1	Trails (Easy) dp	1800	x792
1970C3	Game on Tree (Hard) dfs and similar, dp, games, trees	1900	x653
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x1009
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x105
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x898
1969C	Minimizing the Sum dp, implementation	1700	x5862
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1312
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x2963
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x51
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x116
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1224
1958H	Composite Spells *special problem, dp		x46
1958A	1-3-5 *special problem, dp		x794
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x990
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x3586
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x7538
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3200
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1012
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3450
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x5886
1954F	Unique Strings combinatorics, dp, math	3100	x204
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x4891
1951H	Thanos Snap binary search, dp, games, greedy, trees	3200	x199
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3499
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x20370
1949C	Annual Ants' Gathering dfs and similar, dp, greedy, trees	1900	x1204
1949A	Grove brute force, dfs and similar, dp, geometry, probabilities	3300	x81
1948C	Arrow Path brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths	1300	x14462
1948B	Array Fix brute force, dp, greedy, implementation	1100	x20491
1946F	Nobody is needed 2-sat, data structures, dfs and similar, dp	2500	x776
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2097
1946C	Tree Cutting binary search, dp, greedy, implementation, trees	1600	x9123
1946B	Maximum Sum dp, greedy, math	1100	x17927
1945D	Seraphim the Owl dp, greedy	1300	x12171
1943F	Minimum Hamming Distance dp	3500	x79
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x595
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1255
1942H	Farmer John's Favorite Intern data structures, dp, flows, trees	3500	x59
1942G	Bessie and Cards combinatorics, dp, math	2800	x370
1942D	Learning to Paint binary search, data structures, dfs and similar, dp, greedy, implementation, sortings	2100	x2423
1941E	Rudolf and k Bridges binary search, data structures, dp, two pointers	1600	x8177
1941D	Rudolf and the Ball Game dfs and similar, dp, implementation	1200	x16639
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x29737
1941B	Rudolf and 121 brute force, dp, greedy, math	1000	x26461
1939D	Big Persimmon *special problem, dp, games		x59
1939A	Draw Polygon Lines *special problem, constructive algorithms, dp, geometry, interactive		x14
1937B	Binary Path dp, greedy, implementation	1300	x13109
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x7137
1934B	Yet Another Coin Problem brute force, dp, greedy, math	1200	x16682
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2202
1932F	Feed Cats data structures, dp, sortings	1900	x3401
1932A	Thorns and Coins dp, greedy, implementation	800	x26765
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x250
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x986
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2368
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3697
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1515
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4175
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1550
1927G	Paint Charges data structures, dp, greedy, math	2300	x1493
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x18314
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x2963
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1496
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10067
1926C	Vlad and a Sum of Sum of Digits dp, implementation	1200	x23256
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3229
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x129
1924D	Balanced Subsequences combinatorics, dp, math	2700	x778
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x12356
1923E	Count Paths data structures, dfs and similar, dp, dsu, graphs, trees	2000	x3188
1923B	Monsters Attack! dp, greedy, implementation	1100	x16169
1922F	Replace on Segment dp, graph matchings	2500	x1168
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1128
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x3457
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2366
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x741
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x777
1919C	Grouping Increases data structures, dp, greedy	1400	x16848
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x4273
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x898
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1658
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19436
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x502
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x584
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x132
1914G2	Light Bulbs (Hard Version) combinatorics, data structures, dfs and similar, dp, graphs, hashing	2300	x1226
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1676
1914F	Programming Competition dfs and similar, dp, graph matchings, greedy, trees	1900	x3678
1914D	Three Activities brute force, dp, greedy, implementation, sortings	1200	x18220
1913D	Array Collapse data structures, divide and conquer, dp, trees	2100	x2710
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2042
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x40
1910E	Maximum Sum Subarrays *special problem, dp	2100	x174
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x75
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x831
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1637

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