CP-Snippets

combination-small

• combination-small

• https://thesobersobber.github.io/CP-Snippets/combination-small
  

• github-snip-file

int C(int n,int r){
    r = min(r,n-r);
    int ans = 1;
    for(int i=1;i<=r;i++,n--){
        ans *=n;
        ans/=i;
    }
    return ans;
}