Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round 986 (Div. 2)
10:35:10
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
1197E	Culture Code binary search, combinatorics, data structures, dp, shortest paths, sortings	2300	x1689
1195D2	Submarine in the Rybinsk Sea (hard edition) combinatorics, math, number theory	1800	x4670
1195D1	Submarine in the Rybinsk Sea (easy edition) combinatorics, math, number theory	1500	x7901
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2400	x995
1188E	Problem from Red Panda combinatorics	3300	x233
1185G2	Playlist for Polycarp (hard version) combinatorics, dp	2600	x767
1185G1	Playlist for Polycarp (easy version) bitmasks, combinatorics, dp	2100	x2885
1181C	Flag brute force, combinatorics, dp, implementation	1900	x3153
1178F1	Short Colorful Strip combinatorics, dfs and similar, dp	2200	x2109
1178C	Tiles combinatorics, greedy, math	1300	x12012
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x1454
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	1900	x4063
1167F	Scalar Queries combinatorics, data structures, math, sortings	2300	x1646
1167E	Range Deleting binary search, combinatorics, data structures, two pointers	2100	x2693
1166A	Silent Classroom combinatorics, greedy	900	x14336
1153F	Serval and Bonus Problem combinatorics, dp, math, probabilities	2600	x803
1151F	Sonya and Informatics combinatorics, dp, matrices, probabilities	2300	x1237
1151E	Number of Components combinatorics, data structures, dp, math	2100	x3348
1140E	Palindrome-less Arrays combinatorics, divide and conquer, dp	2200	x1950
1118F2	Tree Cutting (Hard Version) combinatorics, dfs and similar, dp, trees	2700	x541
1111D	Destroy the Colony combinatorics, dp, math	2600	x969
1109D	Sasha and Interesting Fact from Graph Theory brute force, combinatorics, dp, math, trees	2400	x1344
1105C	Ayoub and Lost Array combinatorics, dp, math	1500	x10421
1102E	Monotonic Renumeration combinatorics, sortings	1700	x6042
1097G	Vladislav and a Great Legend combinatorics, dp, trees	3000	x732
1097F	Alex and a TV Show bitmasks, combinatorics, number theory	2500	x1262
1096E	The Top Scorer combinatorics, dp, math, probabilities	2500	x1023
1096B	Substring Removal combinatorics, math, strings	1300	x10625
1091D	New Year and the Permutation Concatenation combinatorics, dp, math	1700	x6805
1089I	Interval-Free Permutations combinatorics	2600	x381
1085G	Beautiful Matrix combinatorics, data structures, dp	2900	x526
1084C	The Fair Nut and String combinatorics, dp, implementation	1500	x8207
1081C	Colorful Bricks combinatorics, dp, math	1500	x7328
1073E	Segment Sum bitmasks, combinatorics, dp, math	2300	x2644
1065E	Side Transmutations combinatorics, strings	2300	x1080
1060F	Shrinking Tree combinatorics, dp	2900	x604
1043F	Make It One bitmasks, combinatorics, dp, math, number theory, shortest paths	2500	x2397
1043D	Mysterious Crime brute force, combinatorics, math, meet-in-the-middle, two pointers	1700	x4461
1037F	Maximum Reduction combinatorics, data structures, math	2500	x1149
1036F	Relatively Prime Powers combinatorics, math, number theory	2400	x1612
1036C	Classy Numbers combinatorics, dp	1900	x9760
1034C	Region Separation combinatorics, dp, number theory, trees	2700	x882
1028D	Order book combinatorics, data structures, greedy	2100	x1745
1027E	Inverse Coloring combinatorics, dp, math	2100	x2136
1009E	Intercity Travelling combinatorics, math, probabilities	2000	x3005
1007B	Pave the Parallelepiped bitmasks, brute force, combinatorics, math, number theory	2400	x954
1007A	Reorder the Array combinatorics, data structures, math, sortings, two pointers	1300	x12183
1000D	Yet Another Problem On a Subsequence combinatorics, dp	1900	x4251
997D	Cycles in product combinatorics, divide and conquer, trees	2900	x458
997C	Sky Full of Stars combinatorics, math	2500	x1733
997B	Roman Digits brute force, combinatorics, dp, greedy, math	2000	x2973
995F	Cowmpany Cowmpensation combinatorics, dp, math, trees	2700	x1260
991E	Bus Number brute force, combinatorics, math	1800	x3505
986B	Petr and Permutations combinatorics, math	1800	x4680
985G	Team Players combinatorics	2700	x525
981H	K Paths combinatorics, data structures, dp, fft, math	3100	x271
978E	Bus Video System combinatorics, math	1400	x9589
961G	Partitions combinatorics, math, number theory	2700	x1363
960G	Bandit Blues combinatorics, dp, fft, math	2900	x1072
960E	Alternating Tree combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees	2300	x1948
954H	Path Counting combinatorics, dp	2500	x590
946F	Fibonacci String Subsequences combinatorics, dp, matrices	2400	x572
938E	Max History combinatorics, math	2300	x1329
933D	A Creative Cutout brute force, combinatorics, math	2900	x333
932E	Team Work combinatorics, dp, math	2400	x2892
929C	Красивая команда *special problem, combinatorics, math	1700	x1154
920G	List Of Integers binary search, bitmasks, brute force, combinatorics, math, number theory	2200	x1755
917C	Pollywog combinatorics, dp, matrices	2900	x404
914H	Ember and Storm's Tree Game combinatorics, dp, games, trees	3400	x239
914C	Travelling Salesman and Special Numbers brute force, combinatorics, dp	1800	x3818
908E	New Year and Entity Enumeration bitmasks, combinatorics, dp, math	2500	x759
900D	Unusual Sequences bitmasks, combinatorics, dp, math, number theory	2000	x3261
896D	Nephren Runs a Cinema chinese remainder theorem, combinatorics, math, number theory	2900	x537
895D	String Mark combinatorics, math, strings	2100	x1115
895C	Square Subsets bitmasks, combinatorics, dp, math	2000	x5621
894B	Ralph And His Magic Field combinatorics, constructive algorithms, math, number theory	1800	x4477
893E	Counting Arrays combinatorics, dp, math, number theory	2000	x3706
891E	Lust combinatorics, math, matrices	3000	x939
888D	Almost Identity Permutations combinatorics, dp, math	1600	x8459
886E	Maximum Element combinatorics, dp, math	2400	x1027
878E	Numbers on the blackboard combinatorics, dp	3300	x569
875D	High Cry binary search, bitmasks, combinatorics, data structures, divide and conquer	2200	x2277
869C	The Intriguing Obsession combinatorics, dp, math	1800	x4727
865G	Flowers and Chocolate combinatorics, math, matrices	3300	x136
859E	Desk Disorder combinatorics, dfs and similar, dsu, graphs, trees	2100	x1867
856C	Eleventh Birthday combinatorics, dp, math	2400	x622
852F	Product transformation combinatorics, math, number theory	2200	x576
848E	Days of Floral Colours combinatorics, divide and conquer, dp, fft, math	3400	x212
848D	Shake It! combinatorics, dp, flows, graphs	2900	x383
844B	Rectangles combinatorics, math	1300	x7466
840C	On the Bench combinatorics, dp	2500	x1762
840A	Leha and Function combinatorics, greedy, math, number theory, sortings	1300	x7007
839D	Winter is here combinatorics, dp, math, number theory	2200	x2955
837F	Prefix Sums binary search, brute force, combinatorics, math, matrices	2400	x982
833C	Ever-Hungry Krakozyabra brute force, combinatorics, greedy, math	2700	x472
830D	Singer House combinatorics, dp, graphs, trees	2800	x849
817B	Makes And The Product combinatorics, implementation, math, sortings	1500	x5777
815D	Karen and Cards binary search, combinatorics, data structures, geometry	2800	x615
815B	Karen and Test brute force, combinatorics, constructive algorithms, math	2200	x1380
814E	An unavoidable detour for home combinatorics, dp, graphs, shortest paths	2600	x669