Coloring cube

#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <cstdint>

std::string RGB = "RGB";

int main() {
    int n;
    std::cin >> n;

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            for (int k = 0; k < n; ++k) {
                std::cout << RGB[(i+j+k)%3] << " ";
            }
            std::cout << std::endl;
        }
        std::cout << std::endl;
    }
}

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