Problemset - Codeforces

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Educational Codeforces Round 173 (Rated for Div. 2)
39:58:27
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Problems

#	Name
1980G	Yasya and the Mysterious Tree bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees	2300	x1290
1980F2	Field Division (hard version) math, sortings	2400	x1033
1980F1	Field Division (easy version) data structures, math, sortings	1900	x3819
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x10780
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x14629
1980C	Sofia and the Lost Operations constructive algorithms, greedy	1300	x18892
1980B	Choosing Cubes sortings, sortings	800	x35173
1980A	Problem Generator math	800	x41543
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x330
1979E	Manhattan Triangle binary search, constructive algorithms, data structures, geometry, implementation, two pointers	2400	x1491
1979D	Fixing a Binary String bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings	1800	x6744
1979C	Earning on Bets binary search, combinatorics, constructive algorithms, number theory	1200	x19119
1979B	XOR Sequences bitmasks, greedy	1000	x23054
1979A	Guess the Maximum brute force, greedy, implementation	800	x29364
1978F	Large Graph data structures, dfs and similar, dsu, graphs, number theory, two pointers	2400	x1366
1978E	Computing Machine brute force, data structures, dp, greedy, implementation	2000	x3898
1978D	Elections data structures, greedy, implementation, math	1600	x11531
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x15232
1978B	New Bakery binary search, greedy, math, ternary search	800	x22709
1978A	Alice and Books constructive algorithms, greedy, sortings	800	x26051
1977E	Tensor constructive algorithms, graphs, interactive	2600	x703
1977D	XORificator bitmasks, brute force, greedy, hashing	2300	x1905
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x6864
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x17915
1977A	Little Nikita math	800	x33926
1976F	Remove Bridges data structures, dfs and similar, dp, greedy, sortings, trees	2800	x603
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x1069
1976D	Invertible Bracket Sequences binary search, combinatorics, data structures, divide and conquer, implementation, two pointers	2000	x4706
1976C	Job Interview binary search, dp, greedy, implementation, two pointers	1600	x10564
1976B	Increase/Decrease/Copy greedy, implementation	1100	x22547
1976A	Verify Password implementation, sortings, strings	800	x29128
1975I	Mind Bloom dp	3500	x104
1975H	378QAQ and Core greedy, strings	3500	x121
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x243
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x850
1975E	Chain Queries binary search, data structures, dfs and similar, implementation, trees	2100	x2371
1975D	Paint the Tree brute force, dfs and similar, dp, greedy, shortest paths, trees	1700	x6168
1975C	Chamo and Mocha's Array binary search, brute force, greedy	1200	x14842
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x18206
1975A	Bazoka and Mocha's Array brute force, greedy, implementation, sortings	800	x19010
1974G	Money Buys Less Happiness Now data structures, greedy, sortings	2000	x4462
1974F	Cutting Game binary search, brute force, data structures, implementation, sortings, two pointers	1900	x3648
1974E	Money Buys Happiness dp	1800	x8227
1974D	Ingenuity-2 constructive algorithms, greedy, implementation	1400	x15103
1974C	Beautiful Triple Pairs combinatorics, data structures	1400	x16032
1974B	Symmetric Encoding implementation, sortings, strings	800	x30874
1974A	Phone Desktop greedy, math	800	x33729
1973F	Maximum GCD Sum Queries bitmasks, brute force, dp, implementation, number theory	3100	x242
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x825
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x1955
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x8514
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x14328
1973A	Chess For Three brute force, dp, implementation, math	900	x25005
1972B	Coin Games games	900	x22189
1972A	Contest Proposal brute force, greedy, two pointers	800	x23309
1971H	±1 2-sat, dfs and similar, graphs	2100	x1907
1971G	XOUR data structures, dsu, sortings	1700	x9482
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x10306
1971E	Find the Car binary search, math, sortings	1500	x14712
1971D	Binary Cut dp, greedy, implementation, sortings, strings	1100	x26438
1971C	Clock and Strings implementation	900	x34093
1971B	Different String implementation, strings	800	x37830
1971A	My First Sorting Problem implementation, sortings	800	x47125
1970G3	Min-Fund Prison (Hard) bitmasks, dfs and similar, dp, graphs, trees	2400	x371
1970G2	Min-Fund Prison (Medium) brute force, dfs and similar, dp, graphs, trees	2200	x619
1970G1	Min-Fund Prison (Easy) dfs and similar, trees	1900	x1400
1970F3	Playing Quidditch (Hard) implementation	2300	x371
1970F2	Playing Quidditch (Medium) implementation	2300	x354
1970F1	Playing Quidditch (Easy) implementation	2300	x434
1970E3	Trails (Hard) dp, matrices	2200	x789
1970E2	Trails (Medium) dp, matrices	2000	x1360
1970E1	Trails (Easy) dp	1800	x2341
1970D3	Arithmancy (Hard) interactive	3100	x112
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x217
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x680
1970C3	Game on Tree (Hard) dfs and similar, dp, games, trees	1900	x1654
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x2914
1970C1	Game on Tree (Easy) games	1400	x3626
1970B3	Exact Neighbours (Hard) constructive algorithms	2300	x501
1970B2	Exact Neighbours (Medium) constructive algorithms	2100	x851
1970B1	Exact Neighbours (Easy) constructive algorithms	1900	x1196
1970A3	Balanced Unshuffle (Hard) constructive algorithms, trees	2400	x508
1970A2	Balanced Unshuffle (Medium) brute force, constructive algorithms, trees	2400	x471
1970A1	Balanced Shuffle (Easy) implementation, sortings	1000	x5186
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x284
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x1447
1969D	Shop Game data structures, greedy, math, sortings	1900	x4726
1969C	Minimizing the Sum dp, implementation	1700	x9018
1969B	Shifts and Sorting constructive algorithms, greedy	1000	x19429
1969A	Two Friends constructive algorithms, implementation, math	800	x20249
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x2007
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x4369
1968F	Equal XOR Segments binary search, data structures	1800	x5631
1968E	Cells Arrangement constructive algorithms	1600	x10640
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x15172
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x25498
1968B	Prefiquence greedy, two pointers	800	x28282
1968A	Maximize? brute force, math, number theory	800	x35142
1967F	Next and Prev brute force, data structures, implementation	3200	x71
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x107