Problemset - Codeforces

→ Pay attention

Before contest
Pinely Round 4 (Div. 1 + Div. 2)
38:42:46
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
1910I	Inverse Problem *special problem, combinatorics, dp	2700	x47
1403C	Chess Rush *special problem, combinatorics, dp, implementation, math	3200	x48
1488H	Build From Suffixes *special problem, combinatorics, data structures	2800	x58
1280F	Intergalactic Sliding Puzzle combinatorics, constructive algorithms, math	3400	x60
1930I	Counting Is Fun combinatorics	3500	x65
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x73
1761F2	Anti-median (Hard Version) combinatorics, dp, math	3500	x79
1704H2	Game of AI (hard version) combinatorics, fft, math	3500	x80
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x89
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings		x97
1988F	Heartbeat combinatorics, dp, fft, math	3000	x104
336E	Vasily the Bear and Painting Square bitmasks, combinatorics, dp, implementation	2700	x113
1909I	Short Permutation Problem combinatorics, dp, fft, math	1900	x116
113E	Sleeping combinatorics, implementation, math	2700	x118
1477F	Nezzar and Chocolate Bars combinatorics, fft, math, probabilities	3500	x129
1580F	Problems for Codeforces combinatorics, fft, math	3300	x131
1810H	Last Number combinatorics, math	2900	x133
1844H	Multiple of Three Cycles combinatorics, data structures, dp, dsu, math	3400	x134
865G	Flowers and Chocolate combinatorics, math, matrices	3300	x135
1984H	Tower Capturing combinatorics, dp, geometry	3300	x144
756E	Byteland coins combinatorics, dp, math	3200	x158
1696H	Maximum Product? brute force, combinatorics, dp, greedy, implementation, math, two pointers	3500	x159
804F	Fake bullions combinatorics, dfs and similar, dp, graphs, number theory	3400	x161
372E	Drawing Circles is Fun combinatorics, geometry	3000	x170
1958F	Narrow Paths *special problem, combinatorics	2000	x174
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x175
1704H1	Game of AI (easy version) combinatorics, constructive algorithms, dp, fft, math	3200	x177
44I	Toys brute force, combinatorics	2300	x185
773F	Test Data Generation combinatorics, divide and conquer, dp, fft, math, number theory	3400	x187
1893E	Cacti Symphony combinatorics, dfs and similar, dp, graphs	3500	x188
1586I	Omkar and Mosaic combinatorics, constructive algorithms, math	3500	x191
1725I	Imitating the Key Tree combinatorics, dsu, trees	2800	x193
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x199
1402C	Star Trek *special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees	2600	x201
848E	Days of Floral Colours combinatorics, divide and conquer, dp, fft, math	3400	x203
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x205
1450H2	Multithreading (Hard Version) combinatorics, implementation, math	3300	x215
1835E	Old Mobile combinatorics, dp, probabilities	3500	x220
1687E	Become Big For Me combinatorics, constructive algorithms, greedy, math, number theory	3500	x222
1188E	Problem from Red Panda combinatorics	3300	x227
1952E	Sweep Line combinatorics, games, math		x228
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x229
1750G	Doping combinatorics, dp, math	3300	x232
914H	Ember and Storm's Tree Game combinatorics, dp, games, trees	3400	x235
1954F	Unique Strings combinatorics, dp, math	3100	x237
145D	Lucky Pair combinatorics, data structures, implementation	2900	x242
217D	Bitonix' Patrol bitmasks, brute force, combinatorics, dfs and similar, math	2900	x246
1743G	Antifibonacci Cut bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math	3000	x250
1864G	Magic Square combinatorics, constructive algorithms, implementation	3100	x256
1254E	Send Tree to Charlie combinatorics, dfs and similar, dsu, trees	3300	x263
981H	K Paths combinatorics, data structures, dp, fft, math	3100	x268
135E	Weak Subsequence combinatorics	3000	x269
1466H	Finding satisfactory solutions combinatorics, dp, graphs, greedy, math	3300	x270
1603F	October 18, 2017 combinatorics, dp, implementation, math	2700	x271
1205E	Expected Value Again combinatorics, strings	3100	x274
457D	Bingo! combinatorics, math, probabilities	2700	x276
1528F	AmShZ Farm combinatorics, fft, math	3300	x281
933D	A Creative Cutout brute force, combinatorics, math	2900	x283
1726G	A Certain Magical Party combinatorics, data structures, greedy, sortings	3300	x288
1605F	PalindORme combinatorics, dp	2900	x296
1470E	Strange Permutation binary search, combinatorics, data structures, dp, graphs, implementation, two pointers	3200	x297
1336E2	Chiori and Doll Picking (hard version) bitmasks, brute force, combinatorics, math	3500	x297
1951G	Clacking Balls combinatorics, math, probabilities	3100	x307
1292F	Nora's Toy Boxes bitmasks, combinatorics, dp	3500	x309
1784E	Infinite Game brute force, combinatorics, dp, games, probabilities	3100	x313
1644F	Basis combinatorics, fft, math, number theory	2900	x319
1671F	Permutation Counting brute force, combinatorics, dp, fft, math	2700	x321
1847E	Triangle Platinum? brute force, combinatorics, implementation, interactive, math, probabilities	2900	x322
794G	Replace All combinatorics, dp, math	3400	x332
776G	Sherlock and the Encrypted Data bitmasks, combinatorics, dp	2900	x335
717A	Festival Organization combinatorics, math, number theory	2900	x339
1773G	Game of Questions bitmasks, combinatorics, dp, fft, math, probabilities	2800	x349
715E	Complete the Permutations combinatorics, fft, graphs, math	3400	x350
1439D	INOI Final Contests combinatorics, dp, fft	3100	x355
518F	Pasha and Pipe binary search, brute force, combinatorics, dp, implementation	2300	x359
1279E	New Year Permutations combinatorics, dp	2700	x360
762F	Tree nesting combinatorics, graphs, trees	2800	x367
1089I	Interval-Free Permutations combinatorics	2600	x370
382E	Ksenia and Combinatorics combinatorics, dp	2600	x371
51E	Pentagon combinatorics, graphs, matrices	2400	x373
1765C	Card Guessing combinatorics, dp, probabilities	2600	x376
212C	Cowboys combinatorics, dp, math	2100	x377
1792F2	Graph Coloring (hard version) brute force, combinatorics, divide and conquer, dp, fft, graphs	2900	x379
848D	Shake It! combinatorics, dp, flows, graphs	2900	x380
1473G	Tiles combinatorics, dp, fft, math	2800	x385
917C	Pollywog combinatorics, dp, matrices	2900	x390
37D	Lesson Timetable combinatorics, dp, math	2300	x391
724F	Uniformly Branched Trees combinatorics, dp, trees	2700	x397
201E	Thoroughly Bureaucratic Organization binary search, combinatorics	2600	x408
1603E	A Perfect Problem combinatorics, dp, math	3200	x412
1924E	Paper Cutting Again combinatorics, probabilities	3100	x414
396D	On Sum of Number of Inversions in Permutations combinatorics, math		x414
1942G	Bessie and Cards combinatorics, dp, math	2800	x415
747F	Igor and Interesting Numbers brute force, combinatorics, dp, math	2500	x416
1299D	Around the World bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees	3000	x425
1450H1	Multithreading (Easy Version) combinatorics, fft, math	2900	x426
997D	Cycles in product combinatorics, divide and conquer, trees	2900	x429
559D	Randomizer combinatorics, geometry, probabilities	2800	x430
1808E3	Minibuses on Venus (hard version) brute force, combinatorics, dp, math	2800	x431
1774G	Segment Covering brute force, combinatorics, constructive algorithms, data structures, dp, trees	3200	x431

←