Description: After building a tree and then seek the depth of the tree, enter the format for (a, b) the standard answer
To Search:
File list (Check if you may need any files):
树的深度
........\Debug
........\树的深度.cpp
........\树的深度.dsp
........\树的深度.dsw
........\树的深度.ncb
........\树的深度.opt
........\树的深度.plg