huffmantree 哈弗曼树编码、解码的C程序。输入一段文字（英文），统计这些字符出现的频率作为权值，进行哈弗曼编码，然后再进行解码，输出到屏幕上。-huffmantree Havermann tree encoding and decoding of the C program. Enter a text (in English), statistical frequency of these characters appear as the weights for Havermann encoding, and then decode the output to the screen.