通常节点的子树被称作“左子树”和“右子树”。
Subtree node is usually referred to as the "left sub-tree" and "the right sub-tree".
根据建立好的哈夫曼树我们进行编码，从根结点出发在左子树则标为0，右则标为1。
According to our well-established Huffman coding, starting from the root node in the left subtree is marked as 0, the right is labeled 1.
二叉树平衡的条件是左子树平衡且右子树平衡且左右子树的高度相差最多为1。基于这个思路递归处理。
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.
传统哈夫曼编码借助树形结构构造，算法实现时使用链表或静态链表结构，空间的每个结点内有左、右子树、双亲指针。
Traditional Huffman coding is structured in the way of tree pattern, using the chain or static chain structure in algorithm, and every node in space has left, right tree and parents Pointers.
传统哈夫曼编码借助树形结构构造，算法实现时使用链表或静态链表结构，空间的每个结点内有左、右子树、双亲指针。
Traditional Huffman coding is structured in the way of tree pattern, using the chain or static chain structure in algorithm, and every node in space has left, right tree and parents Pointers.
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