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AC百题留念~100题了。。。
//1942.cpp by ssy
#include <iostream>
#include <iomanip>
using namespace std;
double ans,n,m;
int main(){
cout<<fixed<<setprecision(0);
while(cin>>n>>m){
if(n==0 && m==0)
break;
if(n>m) swap(n,m);
ans=1;
for(unsigned i=1;i<=n;i++){
ans=ans*(m+i)/i;
}
cout<<ans<<endl;
}
return 0;
}
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