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我的程序,希望对大家有提示#include<iostream>
using namespace std;
int main()
{
int n,k;
while(cin>>n>>k)
{
if(n==0&&k==0)
break;
int i=0;
if(k>n/2)
k=n-k;
int j=k;
__int64 sum=1;
__int64 s=1;
while(i<k)
{
sum*=n;
n--;
i++;
if(sum%j==0)
sum=sum/j;
else
s*=j;
j--;
}
sum/=s;
printf("%I64d\n",sum);
}
return 0;
}
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