C++-函数-给定两个非负整数n和m，编写函数计算组合数C(n, m)
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Background
Description
C++-函数-给定两个非负整数n和m，编写函数计算组合数C(n, m)
Format
Input
Output
Samples
5
2
10
Limitation
1s, 1024KiB for each test case.
