> #include <stdio.h>
> #include <math.h>
> int comp(void* a,void *b){
>     long *p=(long*)a;
>     long *q=(long*)b;
>     return *p>*q;
> }    
> int main(){
>     long cow[10000],num,i,j;
>     __int64 noise=(__int64)0;
>     scanf("%d",&num);   
>     for(i=0;i<num;i++){
>         scanf("%d",&cow[i]);
>     }
>     qsort(cow,num,sizeof(long),comp);
>     for(i=1;i<num;i++){
>         noise=noise+(__int64)2*i*(num-i)*(cow[i]-cow[i-1]);
>     }    
>     printf("%I64d\n",noise);
>     return 0;
> }    

• Re:是不是qsort(cow,num,sizeof(long),comp);错了，把long改__int64试试 (8) waternet 2005-03-05 23:47:37