codechef - even matrix

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fast()(ios_base::sync_with_stdio(0),cin.tie(NULL));
int main()
{
    fast()
    int t;
    cin>>t;
    while(t--)
    {
        int n,i,j,cnt=0,mx=1;
        cin>>n;
        for(i=1;i<=n;i++)
        {
            bool f;
            if(i%2==1)
                {
                    //cout<<++cnt<<" ";
                    cnt=mx;
                    mx+=n;
                    f=true;
                }
                else
                {
                    cnt=mx+n;
                    mx+=n;
                    f=false;
                }
            for(j=1;j<=n;j++)
            {
                if(f)
                {
                    cout<<cnt++<<" ";

                }
                else cout<<--cnt<<" ";

            }
            cout<<endl;
        }
    }
}