Problemset - Codeforces

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Educational Codeforces Round 165 (Rated for Div. 2)
12:59:56
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Problems

#	Name
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory		x858
1957D	A BIT of an Inequality bitmasks, brute force, dp, math		x3176
1957C	How Does the Rook Move? combinatorics, dp, math		x6778
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x2923
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x928
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3123
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x5507
1954F	Unique Strings combinatorics, dp, math	3100	x182
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x4557
1951H	Thanos Snap binary search, dp, games, greedy, trees	3200	x182
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3297
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x19576
1949C	Annual Ants' Gathering dfs and similar, dp, greedy, trees		x1086
1949A	Grove brute force, dfs and similar, dp, geometry, probabilities		x80
1948C	Arrow Path brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths	1300	x14098
1948B	Array Fix brute force, dp, greedy, implementation	1100	x20131
1946F	Nobody is needed 2-sat, data structures, dfs and similar, dp	2500	x742
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2027
1946C	Tree Cutting binary search, dp, greedy, implementation, trees	1600	x8858
1946B	Maximum Sum dp, greedy, math	1100	x17538
1945D	Seraphim the Owl dp, greedy	1300	x11785
1943F	Minimum Hamming Distance dp	3500	x72
1943D2	Counting Is Fun (Hard Version) combinatorics, dp	2800	x560
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1195
1942H	Farmer John's Favorite Intern data structures, dp, flows, trees	3500	x54
1942G	Bessie and Cards combinatorics, dp, math	2800	x352
1942D	Learning to Paint binary search, data structures, dfs and similar, dp, greedy, implementation, sortings	2100	x2364
1941E	Rudolf and k Bridges binary search, data structures, dp, two pointers	1600	x8013
1941D	Rudolf and the Ball Game dfs and similar, dp, implementation	1200	x16349
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x29271
1941B	Rudolf and 121 brute force, dp, greedy, math	1000	x26037
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	x12904
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x7042
1934B	Yet Another Coin Problem brute force, dp, greedy, math	1200	x16416
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2165
1932F	Feed Cats data structures, dp, sortings	1900	x3322
1932A	Thorns and Coins dp, greedy, implementation	800	x26354
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x243
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x976
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2341
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3648
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1480
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4109
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1511
1927G	Paint Charges data structures, dp, greedy, math	2300	x1479
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x18078
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x2895
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1452
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x9822
1926C	Vlad and a Sum of Sum of Digits dp, implementation	1200	x22748
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3189
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x123
1924D	Balanced Subsequences combinatorics, dp, math	2700	x754
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x12215
1923E	Count Paths data structures, dfs and similar, dp, dsu, graphs, trees	2000	x3121
1923B	Monsters Attack! dp, greedy, implementation	1100	x16021
1922F	Replace on Segment dp, graph matchings	2500	x1149
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1110
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x3410
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2334
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x732
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x763
1919C	Grouping Increases data structures, dp, greedy	1400	x16695
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x4213
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x889
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1644
1917B	Erase First or Second Letter brute force, combinatorics, data structures, dp, strings	1100	x19254
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x499
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x581
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	x1211
1914G1	Light Bulbs (Easy Version) brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees	2100	x1658
1914F	Programming Competition dfs and similar, dp, graph matchings, greedy, trees	1900	x3646
1914D	Three Activities brute force, dp, greedy, implementation, sortings	1200	x17978
1913D	Array Collapse data structures, divide and conquer, dp, trees	2100	x2683
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x1995
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x39
1910E	Maximum Sum Subarrays *special problem, dp	2100	x167
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x73
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x822
1909F1	Small Permutation Problem (Easy Version) brute force, combinatorics, dp, math	2200	x1624
1906J	Count BFS Graph combinatorics, dp	2100	x624
1906H	Twin Friends combinatorics, dp	2200	x601
1906E	Merge Not Sort constructive algorithms, dp	1900	x1285
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x840
1904B	Collecting Game binary search, dp, greedy, sortings, two pointers	1100	x12723
1903D2	Maximum And Queries (hard version) bitmasks, divide and conquer, dp, greedy	2500	x702
1902D	Robot Queries binary search, data structures, dp, implementation	1900	x3638
1901E	Compressed Tree dfs and similar, dp, graphs, greedy, sortings, trees	2200	x1354
1901D	Yet Another Monster Fight binary search, dp, greedy, implementation, math	1700	x6095
1900E	Transitive Graph dfs and similar, dp, dsu, graphs, implementation	2100	x1779
1900D	Small GCD bitmasks, brute force, dp, math, number theory	2000	x3670
1900C	Anji's Binary Tree dfs and similar, dp, trees	1300	x10358
1900B	Laura and Operations dp, math	900	x15892
1899C	Yarik and Array dp, greedy, two pointers	1100	x17984
1896H2	Cyclic Hamming (Hard Version) brute force, dp, fft, math, number theory	3500	x85
1896H1	Cyclic Hamming (Easy Version) brute force, divide and conquer, dp, fft, math, number theory	3400	x77
1895G	Two Characters, Two Colors binary search, data structures, dp, flows, greedy	3100	x168

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