第一个是：printf("%d\n",com (n,m+n)); 是去尾
第二个是：printf("%.0lf\n",com (n,m+n)); 是四舍五入


> Source
> 
> Problem Id:1942  User Id:2004huangyimin 
> Memory:48K  Time:1015MS
> Language:C++  Result:Time Limit Exceed
> 
> Source 
> 
> #include < iostream >
> using namespace std;
> unsigned int com (unsigned int n,unsigned int m)
> {
> 	double i;
> 	double result(1);
> 	if ( n >= m - n ){ n = m-n; }
> 	for ( i = m;i >= m-n+1;i-=1 )
> 	{
> 		result *= (i / (i - (m - n)));
> 	}
> 	return result;
> }
> int main()
> {
> 	unsigned int n,m;
> 	while (1)
> 	{
> 		scanf("%d%d",&n,&m);
> 		if ( n==0 && m==0 ){ break; }
> 		printf("%d\n",com (n,m+n));
> 	}
> 	return 0;
> }
> 
> Source
> 
> Problem Id:1942  User Id:2004huangyimin 
> Memory:56K  Time:0MS
> Language:C++  Result:Accepted
> 
> Source 
> 
> #include < iostream >
> using namespace std;
> double com (double n,double m)
> {
> 	double i;
> 	double result(1);
> 	if ( n >= m - n ){ n = m-n; }
> 	for ( i = m;i >= m-n+1;i-=1 )
> 	{
> 		result *= (i / (i - (m - n)));
> 	}
> 	return result;
> }
> int main()
> {
> 	double n,m;
> 	while (1)
> 	{
> 		scanf("%lf%lf",&n,&m);
> 		if ( n==0 && m==0 ){ break; }
> 		printf("%.0lf\n",com (n,m+n));
> 	}
> 	return 0;
> }
> 

• 答非所问...... (93) 00448242 2006-05-02 02:45:52