http://acm.nyist.net/JudgeOnline/problem.php?pid=6

#include<cstdio>
#include<string.h>
#include<algorithm>
#include<functional>
#include<cmath>
using namespace std;
double arr[660];
int main()
{
       int t;
       scanf("%d",&t);
       while(t--)
       {
           int n;
           scanf("%d",&n);
           for(int i=1;i<=n;i++)
           {
               scanf("%lf",arr+i);
           }
           sort(arr+1,arr+n+1,greater<double>());
           int sum=0,index=1;
           double curr=0.0;
           while(1)
           {

               curr+=2*sqrt(arr[index]*arr[index]-1);
               index++;
               sum++;
               if(curr>=20.0) break;
           }
           printf("%d\n",sum);

       }
}