Rearrange Array Alternately gfg

// 1 2 3 4 5 6=>6 1 5 2 4 3

#include <iostream>
using namespace std;

int main() {
    int t,i,j,n,x;
    cin>>t;
    while(t--)
    {
        cin>>n;
        unsigned long long int a[n];
        for(i=0;i<n;i++)cin>>a[i];
        int mni=0,mxi=n-1;
        unsigned long long int mx=a[mxi]+1;
        for(i=0;i<n;i++)
        {
            if(i%2==0)
            {
                a[i]+=(a[mxi]%mx)*mx;
                mxi--;
            }
            else {
                a[i]+=(a[mni]%mx)*mx;
                mni++;
            }
        }
        for(i=0;i<n;i++)cout<<a[i]/mx<<" ";
        cout<<endl;
    }
    return 0;
}