public static int[] arrayLeftRotation(int[] a, int n, int k) {
    // Rotate in-place
    int[] temp = new int[k];
    System.arraycopy(a, 0, temp, 0, k);
    System.arraycopy(a, k, a, 0, n - k);
    System.arraycopy(temp, 0, a, n - k, k);
    return a;
}