赫夫曼编码的程序，读入各个符号及其权值，建立哈夫曼树；利用建立的哈夫曼树对各符号进行编码，输出编码结果。 -Huffman coding of the program that reads the value of the various symbols and their right to build the Huffman tree used to establish the Huffman coding tree for each symbol, the output encodin