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救命啊！我的程序怎么会超时？？？

Posted by xingning001 at 2005-08-31 16:01:52 on Problem 1942 
#include<stdio.h>
main()
{
	_int64 s;
	long a[1000],top,n,m,i;
	while(1)
	{
		scanf("%ld%ld",&n,&m);
		if(n==0&&m==0) break;
		s=1;top=0;
		for(i=n+m;i>n;i--)
		{
			s*=i;
	if(s%(i-n)) 
	a[top++]=(i-n);
	else s/=(i-n);
		}
		for(i=0;i<top;i++)
			s/=a[i];
	printf("%I64d\n",s);
	}
}
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