Summary of design: the procedures used by the data structure is linear tree and table, the algorithm used by the main sculpture, in order Huffman algorithm.
概要设计：本程序所使用的数据结构是树和线性表，所使用的算法主要有堆排序、赫夫曼算法。
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The algorithm uses a fixed set of complementary parity codes to replace the encoding table that dynamically generated by the traditional Huffman method.