Problemset - Codeforces

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Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round)
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Problems

#	Name
1967A	Permutation Counting binary search, greedy, implementation, math, sortings	1400	x12254
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x6571
1965A	Everything Nim games, greedy, math, sortings	1400	x13448
1958E	Yet Another Permutation Constructive *special problem, constructive algorithms	1900	x250
1958D	Staircase *special problem	1600	x500
1958C	Firewood *special problem	1500	x693
1958B	Clock in the Pool *special problem, math	1400	x872
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x4412
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x9477
1956C	Nene's Magical Matrix constructive algorithms, greedy, math	1600	x12721
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x4437
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x6964
1955E	Long Inversions brute force, greedy, implementation, sortings	1700	x8466
1955D	Inaccurate Subsequence Search data structures, two pointers	1400	x15112
1955C	Inhabitant of the Deep Sea greedy, implementation, math	1300	x20897
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x6011
1951C	Ticket Hoarding greedy, math, sortings	1400	x11465
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x4279
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x9001
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x14197
1949I	Disks dfs and similar, geometry, graph matchings, graphs	1800	x1773
1949C	Annual Ants' Gathering dfs and similar, dp, greedy, trees	1900	x1680
1949B	Charming Meals binary search, brute force, greedy, sortings	1500	x3095
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x9283
1948C	Arrow Path brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths	1300	x16589
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4656
1946C	Tree Cutting binary search, dp, greedy, implementation, trees	1600	x10741
1945F	Kirill and Mushrooms data structures, sortings	1900	x4146
1945E	Binary Search binary search, constructive algorithms, greedy	1700	x8008
1945D	Seraphim the Owl dp, greedy	1300	x14251
1943A	MEX Game 1 games, greedy	1300	x17670
1942C2	Bessie's Birthday Cake (Hard Version) geometry, greedy, math	1700	x6092
1942C1	Bessie's Birthday Cake (Easy Version) geometry, greedy, math	1300	x10839
1941F	Rudolf and Imbalance binary search, greedy, sortings, two pointers	1800	x5925
1941E	Rudolf and k Bridges binary search, data structures, dp, two pointers	1600	x9564
1938H	Pho Restaurant	1600	x2119
1938C	Bit Counting Sequence	1900	x1452
1937B	Binary Path dp, greedy, implementation	1300	x14871
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x7378
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8147
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x8093
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6722
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x11108
1932F	Feed Cats data structures, dp, sortings	1900	x4065
1932E	Final Countdown implementation, math, number theory	1600	x8085
1932D	Card Game greedy, implementation	1400	x11336
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x15582
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7949
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x15663
1931D	Divisible Pairs combinatorics, math, number theory	1300	x18660
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4082
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x7004
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4735
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x14720
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x4221
1928C	Physical Education Lesson brute force, math, number theory	1600	x8467
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4314
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x13888
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x21232
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3508
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x11783
1926D	Vlad and Division bitmasks, greedy	1300	x15391
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3617
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x13849
1923D	Slimes binary search, constructive algorithms, data structures, greedy, two pointers	1800	x6713
1923C	Find B constructive algorithms, greedy	1400	x14953
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7656
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x5656
1922C	Closest Cities greedy, implementation, math	1300	x18381
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x3824
1921E	Eat the Chip brute force, games, greedy, math	1600	x9739
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x5569
1920C	Partitioning the Array brute force, math, number theory	1600	x13461
1919C	Grouping Increases data structures, dp, greedy	1400	x18871
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x4749
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x13899
1917C	Watering an Array brute force, greedy, implementation, math	1600	x10399
1916D	Mathematical Problem brute force, constructive algorithms, geometry, math	1700	x8499
1915G	Bicycles graphs, greedy, implementation, shortest paths, sortings	1800	x6287
1915F	Greetings data structures, divide and conquer, sortings	1500	x13611
1915E	Romantic Glasses data structures, greedy, math	1300	x21546
1914F	Programming Competition dfs and similar, dp, graph matchings, greedy, trees	1900	x4089
1914E2	Game with Marbles (Hard Version) games, greedy, sortings	1400	x12312
1914E1	Game with Marbles (Easy Version) brute force, games, greedy, sortings	1400	x12153
1913C	Game with Multiset binary search, bitmasks, brute force, greedy	1300	x14940
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2433
1912D	Divisibility Test math	1900	x1464
1912A	Accumulator Apex data structures, implementation, sortings	1900	x2079
1910D	Remove and Add *special problem, greedy	1800	x350
1910C	Poisonous Swamp special problem, special problem, implementation, implementation	1600	x627
1910B	Security Guard *special problem, greedy	1600	x670
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x118
1909D	Split Plus K greedy, math, number theory	1900	x4400
1909C	Heavy Intervals constructive algorithms, data structures, dsu, greedy, math, sortings	1400	x11114
1907F	Shift and Reverse greedy, sortings	1800	x4868
1907E	Good Triples brute force, combinatorics, number theory	1600	x10179
1907D	Jumping Through Segments binary search, constructive algorithms	1400	x14101
1906M	Triangle Construction greedy, math	1700	x2646
1906E	Merge Not Sort constructive algorithms, dp	1900	x1535
1905C	Largest Subsequence greedy, strings	1400	x12238