二叉树与二叉链表，采用二叉链表存储结构，用递归方式建立二叉树对应的二叉链表，并分别用递归和非递归两种方式实现该二叉树的前序、中序及后序序列的输出 -A binary tree and binary list, using the binary storage structure list, using a recursive approach to building a binary tree corresponding to the binary list, and were used r