请问 L 这样写为什么不对啊，只能过58%

    int n;
    cin >> n;
    cout << (n - 1) / 3 << endl;

    int m = (n - 1) / 6 * 6 + 2;
    for (int i = 2; i < m; i += 6)
    {
        cout << i << ' ' << i + 2 << ' ' << i + 3 << endl;
        cout << i + 1 << ' ' << i + 4 << ' ' << i + 5 << endl;
    }

    if ((n - 1) % 6 >= 3)
        cout << m << ' ' << m + 1 << ' ' << m + 2 << endl;