实现构造哈夫曼树的哈夫曼算法。

Huffman tree structure to achieve the Huffman algorithm.

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要求：可以建立函数输入二叉树，并输出其赫夫曼树。

Requirements: function can be established Binary tree imported and exported its Hefuman tree.

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该算法使用固定奇偶码，省去了传统算法动态生成哈夫曼树的繁琐过程；

The algorithm uses a fixed set of complementary parity codes to replace the encoding table that dynamically generated by the traditional Huffman method.

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