clean

Signed-off-by: Wei Jin <wjin.cn@gmail.com>
add 37

Signed-off-by: Wei Jin <wjin.cn@gmail.com>
add tree depth

Signed-off-by: Wei Jin <wjin.cn@gmail.com>
add jianzhi 40

Signed-off-by: Wei Jin <wjin.cn@gmail.com>