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为什么会wa呢?

Posted by cpp00548001 at 2007-07-10 18:53:53 on Problem 3253
#include<iostream.h>
#include<stdlib.h>
int compare(const void *ele1,const void * ele2)
{
	return (*(int*)ele1)-(*(int*)ele2);
}
void main()
{
	int pieces[20000];
	int num;
	cin>>num;
	for(int i=0;i<num;i++)
	{
		cin>>pieces[i];
	}
	qsort((void*)pieces,num,sizeof(pieces[0]),compare);
	int cost=0;
	int temp;
	for(i=1;i<num;i++)
	{
		pieces[i]=pieces[i]+pieces[i-1];
		cost+=pieces[i];

		temp=pieces[i];
		for(int j=i+1;j<num;j++)
		{
			if(temp>pieces[j])
			{
				pieces[j-1]=pieces[j];
			}
			else {break;}
		}
		pieces[j-1]=temp;
	}
	cout<<cost<<endl;
}

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