熟悉二叉树的各种存储结构的特点及适用范围；掌握建立二叉树的存储结构的方法；熟练掌握二叉树的前序、中序、后序遍历的递归及非递归算法；灵活运用递归的遍历算法实现二叉树的其它各种运算-Familiar with the binary tree structure of a variety of storage features and the scope of application acquire storage to establish the structure of binary tree