Problemset - Codeforces

→ Pay attention

Before contest
CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
44:05:53
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

combinatorics

Add tag

Problems

#	Name
396D	On Sum of Number of Inversions in Permutations combinatorics, math		x437
396A	On Number of Decompositions into Multipliers combinatorics, math, number theory		x1516
392C	Yet Another Number Sequence combinatorics, math, matrices		x594
383E	Vowels combinatorics, divide and conquer, dp	2700	x3157
382E	Ksenia and Combinatorics combinatorics, dp	2600	x382
380D	Sereja and Cinema combinatorics, math	2500	x468
374B	Inna and Nine combinatorics, greedy	1500	x3328
372E	Drawing Circles is Fun combinatorics, geometry	3000	x175
367E	Sereja and Intervals combinatorics, dp	2700	x1143
364A	Matrix combinatorics, data structures, implementation	1600	x4677
360C	Levko and Strings combinatorics, dp	2500	x1109
356C	Compartments combinatorics, constructive algorithms, greedy, implementation	2100	x1272
353B	Two Heaps combinatorics, constructive algorithms, greedy, implementation, math, sortings	1900	x2291
351B	Jeff and Furik combinatorics, dp, probabilities	1900	x2406
340E	Iahub and Permutations combinatorics, math	2000	x2486
340C	Tourist Problem combinatorics, implementation, math	1600	x4242
336E	Vasily the Bear and Painting Square bitmasks, combinatorics, dp, implementation	2700	x116
336D	Vasily the Bear and Beautiful Strings combinatorics, math, number theory	2100	x1013
327E	Axis Walking bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle	2300	x1411
327C	Magic Five combinatorics, math	1700	x3226
325E	The Red Button combinatorics, dfs and similar, dsu, graphs, greedy	2800	x831
323A	Black-and-White Cube combinatorics, constructive algorithms	1600	x747
322B	Ciel and Flowers combinatorics, math	1600	x11872
319A	Malek Dance Club combinatorics, math	1600	x2804
306C	White, Black and White Again combinatorics, number theory	2100	x486
305D	Olya and Graph combinatorics, math	2200	x512
300C	Beautiful Numbers brute force, combinatorics	1800	x9646
296B	Yaroslav and Two Strings combinatorics, dp	2000	x2296
295D	Greg and Caves combinatorics, dp	2400	x657
295C	Greg and Friends combinatorics, dp, graphs, shortest paths	2100	x1736
294C	Shaass and Lights combinatorics, number theory	1900	x3836
293B	Distinct Paths brute force, combinatorics	2700	x871
288D	Polo the Penguin and Trees combinatorics, dfs and similar, trees	2400	x758
288B	Polo the Penguin and Houses combinatorics	1500	x2939
285E	Positions in Permutations combinatorics, dp, math	2600	x1001
285D	Permutation Sum bitmasks, combinatorics, dp, implementation, meet-in-the-middle	1900	x1555
283E	Cow Tennis Tournament combinatorics, data structures, math	2800	x777
272E	Dima and Horses combinatorics, constructive algorithms, graphs	2200	x1230
272D	Dima and Two Sequences combinatorics, math, sortings	1600	x2629
258C	Little Elephant and LCM binary search, combinatorics, dp, math	2000	x1795
258B	Little Elephant and Elections brute force, combinatorics, dp	1900	x1453
251A	Points on Line binary search, combinatorics, two pointers	1300	x17888
235E	Number Challenge combinatorics, dp, implementation, math, number theory	2600	x779
232B	Table bitmasks, combinatorics, dp, math	1900	x1479
229E	Gifts combinatorics, dp, math, probabilities	2600	x466
229C	Triangles combinatorics, graphs, math	1900	x1630
223C	Partial Sums combinatorics, math, number theory	1900	x1568
217D	Bitonix' Patrol bitmasks, brute force, combinatorics, dfs and similar, math	2900	x251
215E	Periodical Numbers combinatorics, dp, number theory	2100	x556
213B	Numbers combinatorics, dp	1900	x1784
212C	Cowboys combinatorics, dp, math	2100	x389
204A	Little Elephant and Interval binary search, combinatorics, dp	1500	x5845
201E	Thoroughly Bureaucratic Organization binary search, combinatorics	2600	x427
176C	Playing with Superglue combinatorics, constructive algorithms	2000	x482
171B	Star *special problem, combinatorics	1300	x4074
156D	Clues combinatorics, graphs	2500	x1596
156C	Cipher combinatorics, dp	2000	x2428
152C	Pocket Book combinatorics	1400	x10673
150B	Quantity of Strings combinatorics, dfs and similar, graphs, math	1600	x4214
145D	Lucky Pair combinatorics, data structures, implementation	2900	x243
145C	Lucky Subsequence combinatorics, dp, math	2100	x1911
140E	New Year Garland combinatorics, dp	2600	x948
135E	Weak Subsequence combinatorics	3000	x306
131C	The World is a Theatre combinatorics, math	1400	x11229
128C	Games with Rectangle combinatorics, dp	2000	x2969
124B	Permutations brute force, combinatorics, implementation	1400	x3949
123C	Brackets combinatorics, dp, greedy	2300	x615
121C	Lucky Permutation brute force, combinatorics, number theory	1900	x1288
113E	Sleeping combinatorics, implementation, math	2700	x119
111D	Petya and Coloring combinatorics, dp	2300	x774
107B	Basketball Team combinatorics, dp, math, probabilities	1600	x3507
91C	Ski Base combinatorics, dsu, graphs	2300	x886
57C	Array combinatorics, math	1900	x2688
52B	Right Triangles combinatorics	1600	x2072
51E	Pentagon combinatorics, graphs, matrices	2400	x410
44I	Toys brute force, combinatorics	2300	x195
40E	Number Table combinatorics	2500	x685
37D	Lesson Timetable combinatorics, dp, math	2300	x419
28C	Bath Queue combinatorics, dp, probabilities	2200	x1058
26D	Tickets combinatorics, math, probabilities	2400	x801
26C	Parquet combinatorics, constructive algorithms, greedy, implementation	2000	x863
15E	Triangles combinatorics, dp	2600	x588
9D	How many trees? combinatorics, divide and conquer, dp	1900	x3914

→