本程序用C语言编写的哈夫曼编码(Huffman Coding)，该方法依据字符出现概率来构造异字头的平均长 度最短的码字，有时称之为最佳编码-Huffman coding (Huffman, from Coding) this program written in C, the average probability to construct different prefix length of the shortest codeword in accordance with the character, sometimes called the best coding