Ksenia and Combinatorics
382E2600· international gm1s256 MB⌨ stdin/stdout
Examples
Sample 1of 4
Input
1 1
Output
0
Sample 2of 4
Input
2 1
Output
1
Sample 3of 4
Input
3 1
Output
3
Sample 4of 4
Input
4 2
Output
12
58%
382E.cpp
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Ln 11·137 BGNU C++20 (64)