小测验-函数定义域

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#include <iostream>
using namespace std;
int Fac(int);
int m,n;
int main() {
      cin>>m>>n;
      cout<<Fac(m)/(Fac(m-n)*Fac(n));
      return 0;
}

int Fac(int n){
      int s=1;
      for (int i = 1; i <= n; i++) {
       s=s*i;
}
return s;
}