> #include <iostream.h>
> #include <stdio.h>
> int c;
> long n;
> long a[1000];
> int main()
>  {
>   cin>>c;
>   while (c)
>    {
>     c--;
>     cin>>n;
>     int i;
>     long sum=0;
>     for (i=1;i<=n;i++)
>      {
>       cin>>a[i];
>       sum+=a[i];
>      }
>     double xb=(double)sum/(double)n;
>     long t=0;
>     for (i=1;i<=n;i++)
>      {
>       if (a[i]>xb) t++;
>      }
>     xb=(double)t/(double)n*100;
>     printf("%.3lf%c\n",xb,'%'); 
>    }
>   return 0;
>  }
>   你这代码错的啊！！过不了