139. Combinations nCr
EasyCombinatorics
Print C(n, r) exactly.
Input format
A single line: n r
Output format
C(n, r)
Example 1
Input
5 2
Output
10
Example 2
Input
10 0
Output
1
Constraints
0 ≤ r ≤ n ≤ 100
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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