简单组合数

简单组合数

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<stack>
#include<cmath>
using namespace std;
#define ll long long
ll pn,t;
ll n,m;
ll sum;
int main()
{
    while(scanf("%lld%lld",&n,&m)!=EOF)
    {
        if(n==0&&m==0) break;
        sum=1;
        t=max(n,m);
        pn=n+m;
        ll p=1;
        for(ll i=t+1;i<=pn;i++)
        {
            sum=sum*i/p;
            p++;
        }
        cout<<sum<<endl;
    }
    return 0;
}