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当k>n/2的时候取k=n-k

Posted by frkstyc at 2005-04-24 12:12:20 on Problem 2249
In 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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