Coloring cube

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

void printl(uint64_t l){
    if (l == 0)
        printf("R ");
    else if (l == 1)
        printf("G ");
    else
        printf("B ");
}

int main() {
    uint64_t n = 0;
    if (scanf("%ld", &n) == 0)
        return EXIT_FAILURE;

    // main algo
    
    for (uint64_t i = 0; i < n; i++){
        for(uint64_t j = 0; j < n; j++){
            for (uint64_t k = 0; k < n; k++){
                printl( ((i % 3) - (j % 3) + k + 3) % 3);
            }
            printf("\n");
        }
        printf("\n");
    }


    return EXIT_SUCCESS;
}

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