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当k>n/2的时候取k=n-kIn Reply To:为什么老超时??? Posted by:00448707 at 2005-04-24 11:13:41 > #include<iostream.h>
> void main()
> {
> long double n,k;
> long double s;
> for(;;)
> {
> s=1;
> cin>>n>>k;
> if(n==0&&k==0) break;
> for(long double i=1;i<=k;i++)
> {
> s*=n+1-i;
> s/=i;
> }
> cout<<s<<endl;
> }
> }
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