1.在电报收发等数据通讯中，常需要将传送的文字转换成由二进制字符0、1组成的字符串来传输。为了使收发的速度提高，就要求电文编码要尽可能地短。此外还要保证任意字符的编码都不是另一个字符编码的前缀，这种编码称为前缀编码。

2.Huffman树可以用来构造编码长度不等且译码不产生二义性的编码。

-1 In the telegram send and receive data communications, and often need to send the text into a string of binary characters consisting of 0,1 to transfer. In order to increase the speed of the transceiver, it is required to encode the message as short as possible. Moreover, you should ensure that any character encoding is not a prefix of another character encoding, this encoding is called prefix code.

 　2.Huffman tree can be used to construct the encoding and decoding of unequal length does not produce ambiguous coding.