Problemset - Codeforces

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Codeforces Round 973 (Div. 2)
16:01:51
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Problems

#	Name
1983C	Have Your Cake and Eat It Too binary search, brute force, greedy, implementation	1400	x11927
1983B	Corner Twist constructive algorithms, greedy, implementation, math	1200	x15549
1983A	Array Divisibility constructive algorithms, math	800	x24929
1982F	Sorting Problem Again binary search, data structures, sortings	2600	x894
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1499
1982D	Beauty of the mountains brute force, data structures, implementation, math, number theory	1700	x6819
1982C	Boring Day binary search, data structures, dp, greedy, two pointers	1200	x16737
1982B	Collatz Conjecture brute force, implementation, math, number theory	1200	x16350
1982A	Soccer greedy, implementation, math, sortings	800	x24259
1981F	Turtle and Paths on a Tree data structures, dp, trees	3000	x246
1981E	Turtle and Intersected Segments data structures, dsu, graphs, greedy	2600	x788
1981D	Turtle and Multiplication constructive algorithms, dfs and similar, graphs, number theory	2400	x1554
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x5090
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x13246
1981A	Turtle and Piggy Are Playing a Game brute force, greedy, math	800	x21744
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1182
1980F2	Field Division (hard version) math, sortings	2400	x943
1980F1	Field Division (easy version) data structures, math, sortings	1900	x3598
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x10055
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x13800
1980C	Sofia and the Lost Operations constructive algorithms, greedy	1300	x17997
1980B	Choosing Cubes sortings, sortings	800	x33717
1980A	Problem Generator math	800	x39229
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x302
1979E	Manhattan Triangle binary search, constructive algorithms, data structures, geometry, implementation, two pointers	2400	x1384
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x6360
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x18163
1979B	XOR Sequences bitmasks, greedy	1000	x21949
1979A	Guess the Maximum brute force, greedy, implementation	800	x28473
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x1264
1978E	Computing Machine brute force, data structures, dp, greedy, implementation	2000	x3612
1978D	Elections data structures, greedy, implementation, math	1600	x10782
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x14377
1978B	New Bakery binary search, greedy, math, ternary search	800	x21732
1978A	Alice and Books constructive algorithms, greedy, sortings	800	x24915
1977E	Tensor constructive algorithms, graphs, interactive	2600	x641
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x1758
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x6505
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x17222
1977A	Little Nikita math	800	x30334
1976F	Remove Bridges data structures, dfs and similar, dp, greedy, sortings, trees	2800	x523
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x988
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers	2000	x4144
1976C	Job Interview binary search, dp, greedy, implementation, two pointers	1600	x9980
1976B	Increase/Decrease/Copy greedy, implementation	1100	x21721
1976A	Verify Password implementation, sortings, strings	800	x27910
1975I	Mind Bloom dp	3500	x82
1975H	378QAQ and Core greedy, strings	3500	x111
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x216
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x784
1975E	Chain Queries binary search, data structures, dfs and similar, implementation, trees	2100	x2190
1975D	Paint the Tree brute force, dfs and similar, dp, greedy, shortest paths, trees	1700	x5757
1975C	Chamo and Mocha's Array binary search, brute force, greedy	1200	x14051
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x17273
1975A	Bazoka and Mocha's Array brute force, greedy, implementation, sortings	800	x18221
1974G	Money Buys Less Happiness Now data structures, greedy, sortings	2000	x4073
1974F	Cutting Game binary search, brute force, data structures, implementation, sortings, two pointers	1900	x3449
1974E	Money Buys Happiness dp	1800	x7646
1974D	Ingenuity-2 constructive algorithms, greedy, implementation	1400	x14319
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x15298
1974B	Symmetric Encoding implementation, sortings, strings	800	x29541
1974A	Phone Desktop greedy, math	800	x32521
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x202
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x773
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x1860
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x8074
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x13585
1973A	Chess For Three brute force, dp, implementation, math	900	x23750
1972B	Coin Games games	900	x20945
1972A	Contest Proposal brute force, greedy, two pointers	800	x22523
1971H	±1 2-sat, dfs and similar, graphs	2100	x1719
1971G	XOUR data structures, dsu, sortings	1700	x8885
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x9583
1971E	Find the Car binary search, math, sortings	1500	x13714
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x25222
1971C	Clock and Strings implementation	900	x31746
1971B	Different String implementation, strings	800	x35765
1971A	My First Sorting Problem implementation, sortings	800	x43374
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x316
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x546
1970G1	Min-Fund Prison (Easy) dfs and similar, trees	1900	x1269
1970F3	Playing Quidditch (Hard) implementation	2300	x337
1970F2	Playing Quidditch (Medium) implementation	2300	x328
1970F1	Playing Quidditch (Easy) implementation	2300	x408
1970E3	Trails (Hard) dp, matrices	2200	x684
1970E2	Trails (Medium) dp, matrices	2000	x1186
1970E1	Trails (Easy) dp	1800	x1997
1970D3	Arithmancy (Hard) interactive	3100	x106
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x198
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x569
1970C3	Game on Tree (Hard) dfs and similar, dp, games, trees	1900	x1432
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x2491
1970C1	Game on Tree (Easy) games	1400	x3187
1970B3	Exact Neighbours (Hard) constructive algorithms	2300	x455
1970B2	Exact Neighbours (Medium) constructive algorithms	2100	x749
1970B1	Exact Neighbours (Easy) constructive algorithms	1900	x1061
1970A3	Balanced Unshuffle (Hard) constructive algorithms, trees	2400	x433
1970A2	Balanced Unshuffle (Medium) brute force, constructive algorithms, trees	2400	x419
1970A1	Balanced Shuffle (Easy) implementation, sortings	1000	x4281
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x250