Problemset - Codeforces

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combinatorics

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Problems

#	Name
1580B	Mathematics Curriculum brute force, combinatorics, dp, trees	2600	x968
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x966
1194F	Crossword Expert combinatorics, dp, number theory, probabilities, two pointers	2400	x965
407C	Curious Array brute force, combinatorics, implementation, math	2500	x953
1784D	Wooden Spoon combinatorics, dp	2400	x952
659G	Fence Divercity combinatorics, dp, number theory	2300	x947
1007B	Pave the Parallelepiped bitmasks, brute force, combinatorics, math, number theory	2400	x935
336D	Vasily the Bear and Beautiful Strings combinatorics, math, number theory	2100	x932
1037F	Maximum Reduction combinatorics, data structures, math	2500	x930
285E	Positions in Permutations combinatorics, dp, math	2600	x930
1408G	Clusterization Counting combinatorics, dp, dsu, fft, graphs, trees	2700	x926
1842G	Tenzing and Random Operations combinatorics, dp, math, probabilities	2800	x924
1817C	Similar Polynomials combinatorics, math	2400	x923
1558D	Top-Notch Insertions combinatorics, data structures	2600	x923
1111D	Destroy the Colony combinatorics, dp, math	2600	x922
1912B	Blueprint for Seating combinatorics, divide and conquer, math	2100	x920
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x919
1365G	Secure Password bitmasks, combinatorics, constructive algorithms, interactive, math	2800	x918
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x913
1691F	K-Set Tree combinatorics, dfs and similar, dp, math, trees	2500	x905
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x900
1737E	Ela Goes Hiking combinatorics, dp, math, probabilities	2500	x891
1701F	Points combinatorics, data structures, implementation, math, matrices	2500	x888
140E	New Year Garland combinatorics, dp	2600	x873
1574E	Coloring combinatorics, constructive algorithms, implementation, math	2500	x872
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x863
91C	Ski Base combinatorics, dsu, graphs	2300	x862
1096E	The Top Scorer combinatorics, dp, math, probabilities	2500	x861
1750F	Majority combinatorics, dp, math, strings	2700	x858
755G	PolandBall and Many Other Balls combinatorics, divide and conquer, dp, fft, math, number theory	3200	x858
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x857
891E	Lust combinatorics, math, matrices	3000	x853
1905E	One-X combinatorics, dfs and similar, dp, math, trees	2400	x851
1034C	Region Separation combinatorics, dp, number theory, trees	2700	x850
1466G	Song of the Sirens combinatorics, divide and conquer, hashing, math, string suffix structures, strings	2600	x848
1806D	DSU Master combinatorics, dp, dsu, math	2500	x847
1264D2	Beautiful Bracket Sequence (hard version) combinatorics, probabilities	2900	x846
1909F2	Small Permutation Problem (Hard Version) combinatorics, dp, math	2500	x827
1237F	Balanced Domino Placements combinatorics, dp	2600	x825
26C	Parquet combinatorics, constructive algorithms, greedy, implementation	2000	x823
1612G	Max Sum Array combinatorics, constructive algorithms, greedy, sortings	2500	x815
1876D	Lexichromatography combinatorics, dfs and similar, dsu, graphs, two pointers	2500	x812
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x811
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x806
830D	Singer House combinatorics, dp, graphs, trees	2800	x804
1425D	Danger of Mad Snakes combinatorics, dp, math	2300	x803
1251F	Red-White Fence combinatorics, fft	2500	x800
722E	Research Rover combinatorics, dp	2900	x798
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x789
1758E	Tick, Tock combinatorics, dfs and similar, dsu, graphs	2500	x779
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x775
293B	Distinct Paths brute force, combinatorics	2700	x772
1924D	Balanced Subsequences combinatorics, dp, math	2700	x770
666C	Codeword combinatorics, strings	2500	x765
1153F	Serval and Bonus Problem combinatorics, dp, math, probabilities	2600	x761
1740F	Conditional Mix combinatorics, dp, math	2600	x758
645F	Cowslip Collections combinatorics, math, number theory	2500	x757
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x752
325E	The Red Button combinatorics, dfs and similar, dsu, graphs, greedy	2800	x751
1383E	Strange Operation combinatorics, data structures, dp	2800	x749
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x747
26D	Tickets combinatorics, math, probabilities	2400	x746
235E	Number Challenge combinatorics, dp, implementation, math, number theory	2600	x741
837F	Prefix Sums binary search, brute force, combinatorics, math, matrices	2400	x738
908E	New Year and Entity Enumeration bitmasks, combinatorics, dp, math	2500	x733
1781F	Bracket Insertion combinatorics, dp, math, trees	2700	x732
809C	Find a car combinatorics, divide and conquer, dp	2600	x726
323A	Black-and-White Cube combinatorics, constructive algorithms	1600	x719
501E	Misha and Palindrome Degree binary search, combinatorics, implementation	2500	x718
283E	Cow Tennis Tournament combinatorics, data structures, math	2800	x716
111D	Petya and Coloring combinatorics, dp	2300	x716
1185G2	Playlist for Polycarp (hard version) combinatorics, dp	2600	x708
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x706
1821F	Timber combinatorics, dp, fft, math	2600	x704
1799G	Count Voting combinatorics, dp, math	2600	x697
1662N	Drone Photo combinatorics, math, sortings		x690
1866M	Mighty Rock Tower brute force, combinatorics, dp, math, probabilities	2400	x687
506E	Mr. Kitayuta's Gift combinatorics, dp, matrices, strings	3000	x685
288D	Polo the Penguin and Trees combinatorics, dfs and similar, trees	2400	x674
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x669
1792F1	Graph Coloring (easy version) combinatorics, dp, graphs	2700	x668
1613F	Tree Coloring combinatorics, divide and conquer, fft	2600	x665
1097G	Vladislav and a Great Legend combinatorics, dp, trees	3000	x662
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x660
1731F	Function Sum brute force, combinatorics, dp, fft, math	2500	x658
40E	Number Table combinatorics	2500	x654
1336E1	Chiori and Doll Picking (easy version) bitmasks, brute force, combinatorics, math	2700	x649
1808E2	Minibuses on Venus (medium version) combinatorics, divide and conquer, dp, matrices	2500	x646
814E	An unavoidable detour for home combinatorics, dp, graphs, shortest paths	2600	x640
295D	Greg and Caves combinatorics, dp	2400	x634
1906J	Count BFS Graph combinatorics, dp	2100	x630
1895F	Fancy Arrays combinatorics, dp, math, matrices	2600	x627
1667E	Centroid Probabilities combinatorics, dp, fft, math	3000	x625
1486F	Pairs of Paths combinatorics, data structures, dfs and similar, dp, trees	2600	x621
1730E	Maximums and Minimums combinatorics, data structures, divide and conquer, number theory	2700	x615
1770F	Koxia and Sequence bitmasks, combinatorics, dp, math, number theory	3100	x614
1762E	Tree Sum combinatorics, math, trees	2600	x606
1906H	Twin Friends combinatorics, dp	2200	x603
815D	Karen and Cards binary search, combinatorics, data structures, geometry	2800	x595
1503E	2-Coloring combinatorics, dp, math	3100	x592