按先序遍历的扩展序列建立二叉树的二叉链表存储结构，实现二叉树先序、中序、后序遍历的递归算法，实现二叉树中序遍历的非递归算法，实现二叉树层次遍历的非递归算法，求二叉树的结点个数，求二叉树的深度。(The binary list storage structure of binary tree is established according to the extended sequence of traversal in the first order, the recursive algorit