Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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combinatorics

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Problems

#	Name
135E	Weak Subsequence combinatorics		3000	x357
131C	The World is a Theatre combinatorics, math		1400	x12576
128C	Games with Rectangle combinatorics, dp		2000	x3244
124B	Permutations brute force, combinatorics, implementation		1400	x4871
123C	Brackets combinatorics, dp, greedy		2300	x720
121C	Lucky Permutation brute force, combinatorics, number theory		1900	x1434
113E	Sleeping combinatorics, implementation, math		2700	x142
111D	Petya and Coloring combinatorics, dp		2300	x901
107B	Basketball Team combinatorics, dp, math, probabilities		1600	x4271
91C	Ski Base combinatorics, dsu, graphs		2300	x1011
57C	Array combinatorics, math		1900	x4002
52B	Right Triangles combinatorics		1600	x2406
51E	Pentagon combinatorics, graphs, matrices		2400	x454
44I	Toys brute force, combinatorics		2300	x231
40E	Number Table combinatorics		2500	x810
37D	Lesson Timetable combinatorics, dp, math		2300	x554
28C	Bath Queue combinatorics, dp, probabilities		2200	x1284
26D	Tickets combinatorics, math, probabilities		2400	x930
26C	Parquet combinatorics, constructive algorithms, greedy, implementation		2000	x1012
15E	Triangles combinatorics, dp		2600	x673
9D	How many trees? combinatorics, divide and conquer, dp		1900	x4499

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