Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
40:41:12
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
735C	Tennis Championship combinatorics, constructive algorithms, greedy, math	1600	x7329
1420D	Rescue Nibel! combinatorics, data structures, sortings	1800	x7287
1866B	Battling with Numbers combinatorics, math, number theory	1400	x7144
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x7125
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x7075
844B	Rectangles combinatorics, math	1300	x6967
1829H	Don't Blame Me bitmasks, combinatorics, dp, math	1700	x6959
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x6952
1081C	Colorful Bricks combinatorics, dp, math	1500	x6947
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x6791
518D	Ilya and Escalator combinatorics, dp, math, probabilities	1700	x6659
1833F	Ira and Flamenco combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers	1700	x6601
1091D	New Year and the Permutation Concatenation combinatorics, dp, math	1700	x6579
630F	Selection of Personnel combinatorics, math	1300	x6538
489D	Unbearable Controversy of Being brute force, combinatorics, dfs and similar, graphs	1700	x6528
1879D	Sum of XOR Functions bitmasks, combinatorics, divide and conquer, dp, math	1700	x6476
608B	Hamming Distance Sum combinatorics, strings	1500	x6463
1329B	Dreamoon Likes Sequences bitmasks, combinatorics, math	1700	x6346
677C	Vanya and Label bitmasks, combinatorics, implementation, strings	1500	x6266
630I	Parking Lot combinatorics, math	1700	x6253
559C	Gerald and Giant Chess combinatorics, dp, math, number theory	2200	x6122
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x6075
459C	Pashmak and Buses combinatorics, constructive algorithms, math	1900	x6059
1444B	Divide and Sum combinatorics, math, sortings	1900	x6016
1279D	Santa's Bot combinatorics, math, probabilities	1700	x5855
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5764
1207D	Number Of Permutations combinatorics	1800	x5764
1238D	AB-string binary search, combinatorics, dp, strings	1900	x5721
1359E	Modular Stability combinatorics, math, number theory	2000	x5716
1545B	AquaMoon and Chess combinatorics, math	1900	x5605
1102E	Monotonic Renumeration combinatorics, sortings	1700	x5577
817B	Makes And The Product combinatorics, implementation, math, sortings	1500	x5530
1750D	Count GCD combinatorics, math, number theory	1800	x5512
204A	Little Elephant and Interval binary search, combinatorics, dp	1500	x5512
1454E	Number of Simple Paths combinatorics, dfs and similar, graphs, trees	2000	x5488
621C	Wet Shark and Flowers combinatorics, math, number theory, probabilities	1700	x5274
1735D	Meta-set brute force, combinatorics, data structures, hashing, math	1700	x5251
1749D	Counting Arrays combinatorics, dp, math, number theory	1900	x5225
895C	Square Subsets bitmasks, combinatorics, dp, math	2000	x5094
1426F	Number of Subsequences combinatorics, dp, strings	2000	x5080
1371E1	Asterism (Easy Version) binary search, brute force, combinatorics, math, number theory, sortings	1900	x4944
479E	Riding in a Lift combinatorics, dp	1900	x4925
689C	Mike and Chocolate Thieves binary search, combinatorics, math	1700	x4858
1202D	Print a 1337-string... combinatorics, constructive algorithms, math, strings	1900	x4856
630H	Benches combinatorics, math	1400	x4728
1276B	Two Fairs combinatorics, dfs and similar, dsu, graphs	1900	x4662
364A	Matrix combinatorics, data structures, implementation	1600	x4590
986B	Petr and Permutations combinatorics, math	1800	x4552
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4411
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4368
1043D	Mysterious Crime brute force, combinatorics, math, meet-in-the-middle, two pointers	1700	x4364
869C	The Intriguing Obsession combinatorics, dp, math	1800	x4346
711D	Directed Roads combinatorics, dfs and similar, graphs, math	1900	x4343
552D	Vanya and Triangles brute force, combinatorics, data structures, geometry, math, sortings	1900	x4341
1824B1	LuoTianyi and the Floating Islands (Easy Version) combinatorics, math, probabilities, trees	1800	x4299
1442B	Identify the Operations combinatorics, data structures, dsu, greedy, implementation	1800	x4293
1717D	Madoka and The Corruption Scheme combinatorics, constructive algorithms, greedy, math	1900	x4230
685A	Robbers' watch brute force, combinatorics, dp, math	1700	x4141
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x4101
340C	Tourist Problem combinatorics, implementation, math	1600	x4096
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4068
449D	Jzzhu and Numbers bitmasks, combinatorics, dp	2400	x4039
1857G	Counting Graphs combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees	2000	x4035
401D	Roman and Numbers bitmasks, brute force, combinatorics, dp, number theory	2000	x3959
1366E	Two Arrays binary search, brute force, combinatorics, constructive algorithms, dp, two pointers	2100	x3948
150B	Quantity of Strings combinatorics, dfs and similar, graphs, math	1600	x3942
1000D	Yet Another Problem On a Subsequence combinatorics, dp	1900	x3938
171B	Star *special problem, combinatorics	1300	x3931
1622D	Shuffle combinatorics, math, two pointers	2000	x3865
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x3821
1696E	Placing Jinas combinatorics, math	2000	x3811
124B	Permutations brute force, combinatorics, implementation	1400	x3733
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	1900	x3714
294C	Shaass and Lights combinatorics, number theory	1900	x3701
1788D	Moving Dots binary search, brute force, combinatorics, math, two pointers	2000	x3693
9D	How many trees? combinatorics, divide and conquer, dp	1900	x3645
914C	Travelling Salesman and Special Numbers brute force, combinatorics, dp	1800	x3586
1332E	Height All the Same combinatorics, constructive algorithms, math, matrices	2100	x3549
1467D	Sum of Paths combinatorics, dp, math	2200	x3532
1584D	Guess the Permutation binary search, combinatorics, interactive, math	2000	x3505
991E	Bus Number brute force, combinatorics, math	1800	x3395
1515E	Phoenix and Computers combinatorics, dp, math	2200	x3344
1794D	Counting Factorizations combinatorics, divide and conquer, dp, math, number theory	1900	x3323
1606E	Arena combinatorics, dp, math	2100	x3321
1886D	Monocarp and the Set combinatorics, data structures, math	2100	x3289
107B	Basketball Team combinatorics, dp, math, probabilities	1600	x3272
1787D	Game on Axis combinatorics, dfs and similar, dsu, graphs, implementation	1900	x3244
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3234
374B	Inna and Nine combinatorics, greedy	1500	x3228
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3227
451E	Devu and Flowers bitmasks, combinatorics, number theory	2300	x3207
1777D	Score of a Tree bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees	1900	x3188
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3180
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3165
327C	Magic Five combinatorics, math	1700	x3106
1271E	Common Number binary search, combinatorics, dp, math	2100	x3105
652C	Foe Pairs combinatorics, sortings, two pointers	1800	x3065
500D	New Year Santa Network combinatorics, dfs and similar, graphs, trees	1900	x3027
1151E	Number of Components combinatorics, data structures, dp, math	2100	x3020
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3004