TheWireUs-Day1

#include <bits/stdc++.h>

#define ll long long

using namespace std;

int main()
{
    ll r, c;
    cin >> r >> c; //r= number of rows, c=number of colums
    int a[r][c];
    for (ll i = 0; i < r; i++)
    {
        for (ll j = 0; j < c; j++)
        {
            cin >> a[i][j];
        }
    }

    for (ll j = 0; j < c; j++)
    {
        //if j is odd --> go up
        if (j % 2)
        {
            for (ll i = r - 1; i >= 0; i--)
            {
                cout << a[i][j] << ",";
            }
        }
        else
        {
            for (ll i = 0; i < r; i++)
            {
                cout << a[i][j] << ",";
            }
        }
    }
    cout << "END";
    return 0;
}
/*
sample input:
4 4
11 12 13 14
21 22 23 24
31 32 33 34
41 42 43 44
*/