Problemset - Codeforces

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combinatorics

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Problems

#	Name
1599C	Bubble Strike combinatorics, math, probabilities, ternary search	2000	x1555
258C	Little Elephant and LCM binary search, combinatorics, dp, math	2000	x1757
689E	Mike and Geometry Problem combinatorics, data structures, dp, geometry, implementation	2000	x1808
696C	PLEASE combinatorics, dp, implementation, math, matrices	2000	x2049
296B	Yaroslav and Two Strings combinatorics, dp	2000	x2070
557D	Vitaly and Cycle combinatorics, dfs and similar, graphs, math	2000	x2136
156C	Cipher combinatorics, dp	2000	x2291
340E	Iahub and Permutations combinatorics, math	2000	x2298
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2436
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2577
1764D	Doremy's Pegging Game combinatorics, dp, math	2000	x2640
128C	Games with Rectangle combinatorics, dp	2000	x2692
997B	Roman Digits brute force, combinatorics, dp, greedy, math	2000	x2856
1009E	Intercity Travelling combinatorics, math, probabilities	2000	x2885
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x2983
803F	Coprime Subsequences bitmasks, combinatorics, number theory	2000	x2990
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3260
1584D	Guess the Permutation binary search, combinatorics, interactive, math	2000	x3522
1788D	Moving Dots binary search, brute force, combinatorics, math, two pointers	2000	x3728
1696E	Placing Jinas combinatorics, math	2000	x3831
1622D	Shuffle combinatorics, math, two pointers	2000	x3873
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3968
1857G	Counting Graphs combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees	2000	x4077
1426F	Number of Subsequences combinatorics, dp, strings	2000	x5109
895C	Square Subsets bitmasks, combinatorics, dp, math	2000	x5122
1454E	Number of Simple Paths combinatorics, dfs and similar, graphs, trees	2000	x5509
1359E	Modular Stability combinatorics, math, number theory	2000	x5727
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x73
121C	Lucky Permutation brute force, combinatorics, number theory	1900	x1266
232B	Table bitmasks, combinatorics, dp, math	1900	x1387
258B	Little Elephant and Elections brute force, combinatorics, dp	1900	x1420
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1507
223C	Partial Sums combinatorics, math, number theory	1900	x1512
229C	Triangles combinatorics, graphs, math	1900	x1591
213B	Numbers combinatorics, dp	1900	x1664
553B	Kyoya and Permutation binary search, combinatorics, constructive algorithms, greedy, implementation, math	1900	x2094
353B	Two Heaps combinatorics, constructive algorithms, greedy, implementation, math, sortings	1900	x2169
568B	Symmetric and Transitive combinatorics, dp, math	1900	x2219
351B	Jeff and Furik combinatorics, dp, probabilities	1900	x2276
57C	Array combinatorics, math	1900	x2324
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x2862
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x2997
1181C	Flag brute force, combinatorics, dp, implementation	1900	x3003
500D	New Year Santa Network combinatorics, dfs and similar, graphs, trees	1900	x3065
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3194
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3208
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3211
1787D	Game on Axis combinatorics, dfs and similar, dsu, graphs, implementation	1900	x3259
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3341
9D	How many trees? combinatorics, divide and conquer, dp	1900	x3667
294C	Shaass and Lights combinatorics, number theory	1900	x3714
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	1900	x3719
1000D	Yet Another Problem On a Subsequence combinatorics, dp	1900	x3960
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4156
1717D	Madoka and The Corruption Scheme combinatorics, constructive algorithms, greedy, math	1900	x4252
552D	Vanya and Triangles brute force, combinatorics, data structures, geometry, math, sortings	1900	x4355
711D	Directed Roads combinatorics, dfs and similar, graphs, math	1900	x4356
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x4666
479E	Riding in a Lift combinatorics, dp	1900	x4933
1202D	Print a 1337-string... combinatorics, constructive algorithms, math, strings	1900	x4947
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x4951
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5262
1545B	AquaMoon and Chess combinatorics, math	1900	x5632
1238D	AB-string binary search, combinatorics, dp, strings	1900	x5731
1444B	Divide and Sum combinatorics, math, sortings	1900	x6040
459C	Pashmak and Buses combinatorics, constructive algorithms, math	1900	x6068
1036C	Classy Numbers combinatorics, dp	1900	x8583
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x9797
577B	Modulo Sum combinatorics, data structures, dp, two pointers	1900	x11469
690D2	The Wall (medium) combinatorics	1800	x1209
575H	Bots combinatorics, dp, math, number theory	1800	x1631
1912K	Kim's Quest bitmasks, combinatorics, dp	1800	x2025
603B	Moodular Arithmetic combinatorics, dfs and similar, dsu, math, number theory	1800	x2534
626D	Jerry's Protest brute force, combinatorics, dp, probabilities	1800	x2650
652C	Foe Pairs combinatorics, sortings, two pointers	1800	x3092
991E	Bus Number brute force, combinatorics, math	1800	x3404
914C	Travelling Salesman and Special Numbers brute force, combinatorics, dp	1800	x3595
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x3834
1442B	Identify the Operations combinatorics, data structures, dsu, greedy, implementation	1800	x4305
1824B1	LuoTianyi and the Floating Islands (Easy Version) combinatorics, math, probabilities, trees	1800	x4328
869C	The Intriguing Obsession combinatorics, dp, math	1800	x4359
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4376
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4478
986B	Petr and Permutations combinatorics, math	1800	x4557
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x4780
1750D	Count GCD combinatorics, math, number theory	1800	x5560
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5770
1207D	Number Of Permutations combinatorics	1800	x5775
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x6098
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x7294
1420D	Rescue Nibel! combinatorics, data structures, sortings	1800	x7322
1327E	Count The Blocks combinatorics, dp, math	1800	x8548
300C	Beautiful Numbers brute force, combinatorics	1800	x8862
929C	Красивая команда *special problem, combinatorics, math	1700	x1141
596C	Wilbur and Points combinatorics, greedy, sortings	1700	x2234
327C	Magic Five combinatorics, math	1700	x3110
685A	Robbers' watch brute force, combinatorics, dp, math	1700	x4142
1043D	Mysterious Crime brute force, combinatorics, math, meet-in-the-middle, two pointers	1700	x4367
689C	Mike and Chocolate Thieves binary search, combinatorics, math	1700	x4874
1735D	Meta-set brute force, combinatorics, data structures, hashing, math	1700	x5275