if (N == 1) {
    printField(a, false);
} else if (N % 2 == 0) {
    printField(a, true);
} else if ((N - 3) % 4 == 0) {
    countDown(a, R, C);
    explodeBombs(a, R, C);
    printField(a, false);
} else {
    countDown(a, R, C);
    explodeBombs(a, R, C);
    countDown(a, R, C);
    explodeBombs(a, R, C);
    printField(a, false);
}