#include<iostream>
#include<cmath>
#define EPS 1e-9
int cas,n;
int x[1000],y[1000];
using namespace std;
double calc(double d)
{
int i,j;
double dis1,dis2,dis;
dis = 0.0;
for(i=1;i<n;i++)
{
for(j=i+1;j<=n;j++)
{
dis1 = fabs(cos(d)*(y[i]-y[j])-sin(d)*(x[i]-x[j])); //将一条线段在旋转坐标时沿X轴的长
dis2 = fabs(sin(d)*(y[i]-y[j])+cos(d)*(x[i]-x[j])); // 将一条线段在旋转坐标时沿y轴的长
if(dis<dis1)
dis = dis1;
if(dis < dis2)
dis = dis2;
}
}
return (dis*dis);
}
int main()
{
double l,r,mid,midmid;
double s1,s2;
cin>>cas;
while(cas--)
{
cin>>n;
for(int i=1;i<=n;i++)
cin>>x[i]>>y[i];
l = 0.0;
r = acos(-1.0);
while(r-l >= EPS)
{
mid = (l+r)/2;
midmid = (mid+r)/2;
s1 = calc(mid);
s2 = calc(midmid);
if(s1<s2)
r = midmid;
else
l = mid;
}
printf("%0.2lf\n",s1<s2?s1:s2);
}
return 0;
}
//通式
- int SanFen(int l,int r)
- {
- while(l < r-1)
- {
- int mid = (l+r)/2;
- int mmid = (mid+r)/2;
- if( f(mid) > f(mmid) )
- r = mmid;
- else
- l = mid;
- }
- return f(l) > f(r) ? l : r;
- }