iiitv/ChefLib

// Code written by Monal
#include"bits/stdc++.h"

using namespace std;
int main()
{
    ios::sync_with_stdio(false);
    int tc;
    cin>>tc;
    while(tc--)
    {
        int n;
        cin>>n;
        int ones=0;
        int tmp;
        for(int i=0;i<n*n;++i)
        {
            cin>>tmp;
            if(tmp)
                ones++;
        }
        if(ones<=n)
            cout<<"0\n";
        else
        {
            tmp=0;
            for(int i=0;i<n;++i)
            {
                tmp+=2*i;
                int back=(2*i+1)*n-(tmp);
                int front=(2*(i+1)+1)*n-(tmp+2*(i+1));
                if(ones>back&&ones<=front)
                {
                    cout<<i+1<<"\n";
                }
            }
        }
    }
    return 0;
}