#include<iostream>
using namespace std;

int main()
{
	long n,k,sum,i,j;
	while(cin>>n>>k)
	{
		if(n==0&&k==0)
			break;

		sum=1;

		if(k!=0)
			for(i=n-k+1,j=1;i<n+1;i++,j++)						
				sum = sum*i/j;

		cout<<sum<<endl;
	}
	return 0;
}

• Re:为什么老超时？？？ (19) chustfuzhiping 2006-08-09 16:24:32