对二叉树的删除、复制、中序遍历采用递归方式实现。 层序遍历采用辅助队列数据结构完成，为了计算层高， 使用了两个队列，交替的向两队列中插入相邻的两层， 这样完成层高的统计。-On the binary tree delete, copy, preorder recursive manner. Traversal sequence complete with assisted queue data structure, in order to calculate storey,

数据结构对二叉树结构的C++代码实现，包含基本的建立二叉树，各种方式遍历二叉树，深度计算、结点个数计算-Data structure of binary tree structure of the c++ code, include the establishment of the basic binary tree, various ways to traverse the binary tree, depth calculation and node number calculation,