利用Huffman编码实现文件压缩解压的算法，改源码为C++面向过程的。主要是由函数组成，包括主函数、压缩函数、解压函数、界面函数。-Use Huffman encoding for file compression and decompression algorithms, change-oriented C++ source code for the procedure. It is mainly made up of functions, including the main function, the compression function, decompression functions, interface functions.