Problemset - Codeforces

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Problems

#	Name
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x4615
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x12381
1981A	Turtle and Piggy Are Playing a Game brute force, greedy, math	800	x20731
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1036
1980F2	Field Division (hard version) math, sortings	2400	x861
1980F1	Field Division (easy version) data structures, math, sortings	1900	x3343
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x9314
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x12934
1980C	Sofia and the Lost Operations constructive algorithms, greedy	1300	x17065
1980B	Choosing Cubes sortings, sortings	800	x32374
1980A	Problem Generator math	800	x37489
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x252
1979E	Manhattan Triangle binary search, constructive algorithms, data structures, geometry, implementation, two pointers	2400	x1246
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x5890
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x17089
1979B	XOR Sequences bitmasks, greedy	1000	x20981
1979A	Guess the Maximum brute force, greedy, implementation	800	x27309
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x1139
1978E	Computing Machine brute force, data structures, dp, greedy, implementation	2000	x3257
1978D	Elections data structures, greedy, implementation, math	1600	x9798
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x13270
1978B	New Bakery binary search, greedy, math, ternary search	800	x20523
1978A	Alice and Books constructive algorithms, greedy, sortings	800	x23476
1977E	Tensor constructive algorithms, graphs, interactive	2600	x580
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x1627
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x6036
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x16492
1977A	Little Nikita math	800	x28695
1976F	Remove Bridges data structures, dfs and similar, dp, greedy, sortings, trees	2800	x477
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x887
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers	2000	x3685
1976C	Job Interview binary search, dp, greedy, implementation, two pointers	1600	x9278
1976B	Increase/Decrease/Copy greedy, implementation	1100	x20635
1976A	Verify Password implementation, sortings, strings	800	x26317
1975I	Mind Bloom dp	3500	x67
1975H	378QAQ and Core greedy, strings	3500	x90
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x204
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x723
1975E	Chain Queries binary search, data structures, dfs and similar, implementation, trees	2100	x2015
1975D	Paint the Tree brute force, dfs and similar, dp, greedy, shortest paths, trees	1700	x5343
1975C	Chamo and Mocha's Array binary search, brute force, greedy	1200	x13250
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x16354
1975A	Bazoka and Mocha's Array brute force, greedy, implementation, sortings	800	x17646
1974G	Money Buys Less Happiness Now data structures, greedy, sortings	2000	x3786
1974F	Cutting Game binary search, brute force, data structures, implementation, sortings, two pointers	1900	x3226
1974E	Money Buys Happiness dp	1800	x7106
1974D	Ingenuity-2 constructive algorithms, greedy, implementation	1400	x13530
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x14512
1974B	Symmetric Encoding implementation, sortings, strings	800	x28667
1974A	Phone Desktop greedy, math	800	x31369
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x185
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x721
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x1748
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x7592
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12900
1973A	Chess For Three brute force, dp, implementation, math	900	x22663
1972B	Coin Games games	900	x19838
1972A	Contest Proposal brute force, greedy, two pointers	800	x21639
1971H	±1 2-sat, dfs and similar, graphs	2100	x1544
1971G	XOUR data structures, dsu, sortings	1700	x8299
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x8927
1971E	Find the Car binary search, math, sortings	1500	x12740
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x23807
1971C	Clock and Strings implementation	900	x29806
1971B	Different String implementation, strings	800	x33583
1971A	My First Sorting Problem implementation, sortings	800	x40679
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x275
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x474
1970G1	Min-Fund Prison (Easy) dfs and similar, trees	1900	x1118
1970F3	Playing Quidditch (Hard) implementation	2300	x313
1970F2	Playing Quidditch (Medium) implementation	2300	x307
1970F1	Playing Quidditch (Easy) implementation	2300	x381
1970E3	Trails (Hard) dp, matrices	2200	x576
1970E2	Trails (Medium) dp, matrices	2000	x1011
1970E1	Trails (Easy) dp	1800	x1684
1970D3	Arithmancy (Hard) interactive	3100	x90
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x170
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x517
1970C3	Game on Tree (Hard) dfs and similar, dp, games, trees	1900	x1245
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x2142
1970C1	Game on Tree (Easy) games	1400	x2796
1970B3	Exact Neighbours (Hard) constructive algorithms	2300	x400
1970B2	Exact Neighbours (Medium) constructive algorithms	2100	x654
1970B1	Exact Neighbours (Easy) constructive algorithms	1900	x928
1970A3	Balanced Unshuffle (Hard) constructive algorithms, trees	2400	x399
1970A2	Balanced Unshuffle (Medium) brute force, constructive algorithms, trees	2400	x390
1970A1	Balanced Shuffle (Easy) implementation, sortings	1000	x3790
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x217
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x1209
1969D	Shop Game data structures, greedy, math, sortings	1900	x4084
1969C	Minimizing the Sum dp, implementation	1700	x7727
1969B	Shifts and Sorting constructive algorithms, greedy	1000	x17457
1969A	Two Friends constructive algorithms, implementation, math	800	x18807
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1740
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x3855
1968F	Equal XOR Segments binary search, data structures	1800	x4928
1968E	Cells Arrangement constructive algorithms	1600	x9547
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x13844
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x23218
1968B	Prefiquence greedy, two pointers	800	x26503