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);
}
}
