实现二叉树，DOS显示，帮助大家理解二叉树的建立和存储结构-The realization of binary tree, DOS shows that help people understand the tree establishment and storage structure

数据结构 二叉树的建立，前序中序，后续遍历，还有非递归算法-Bitree create

哈夫曼树，二叉哈夫曼树的建立（两种方式），以及三种遍历方式（递归与非递归）-The haffman tree, the creation of the binary hafman tree (two ways), and the three ways of traversing (recursion and non-recursion)