Coloring cube

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // freopen("input.txt", "r", stdin); // TODO: REMOVE THIS YOU STUPID ****

    int n;
    cin >> n;

    const char colors[3] = {'R', 'G', 'B'};

    for (int z = 0; z < n; z++) {
        for (int x = 0; x < n; x++) {
            for (int y = 0; y < n; y++) {
                if (y > 0) cout << ' ';
                cout << colors[(x + y + z) % 3];
            }
            cout << '\n';
        }
        cout << '\n';
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED