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Re:遇到一个奇怪的问题,请大家帮帮忙,很简单的

Posted by tanxiaoya at 2010-08-03 09:37:10 on Problem 1862
In Reply To:遇到一个奇怪的问题,请大家帮帮忙,很简单的 Posted by:abilitytao at 2008-08-16 16:25:57
> #include<iostream>
> #include<stdio.h>
> #include<math.h>
> using namespace std;
> int cmp(const void *a,const void *b)
> {
> 	return ((*(double*)a)>(*(double*)b))?1:-1;
> }
> 
> int main()
> {
> 	int n,i,j;
> 	double a[101];
> 	scanf("%d",&n);
> 	for(i=0;i<n;i++)
> 		scanf("%f",&a[i]);//把这里的f改成lf就对了,为什么呀,有区别么?
> 	if(n==1)
> 	{
> 		printf("%.3f\n",a[0]);
> 		return 0;
> 	}
> 	qsort(a,n,sizeof(a[0]),cmp);
> 	for(i=n-2;i>=0;i--)
> 	{
> 		a[i]=2*sqrt(a[i]*a[i+1]);
> 	}
> 
> 	printf("%.3f\n",a[0]);
> 	return 0;
> }
> 
> 
> 问题在我的注释里。

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