说明：  huffman 哈夫曼编/译码器 利用哈夫曼编码进行通信可以大大提高1言道利用率，缩短信息传速时间，降低传输成本。但是．这要求在发送端通过一个编码系统对待传数据预先编码．在接收端将传来的数据进行译码（复原）。对于双工信道（即可以双向传输俏息的信道），每端都需要一个完整的编/译码系统。试为这样的信息收发站写一个哈夫曼码的编／译码系统。
(huffman Huffman encoder/decoder to communicate using Huffman coding can greatly improve a speech channel utilization, reduce the speed of information transmission time and reduce transport costs. However. This requires the sender to pass through a coding system to treat the data pre-encoding. At the receiving end to decode data from the (recovery). For the duplex channel (ie, interest rates can be pretty two-way transmission channel), each side needs a complete encoding/decoding system. Test for such messaging station to write a Huffman encoding/decoding system.)