基于赫夫曼树的压缩算法
二进制读入文件，对txt有较好压缩效果，而对MP4、pdf等已经被处理过的文件格式效果不不明显。但是是初学者很好的学习资料。(The compression algorithm based on Huffman tree
Binary read into the file, TXT has a better compression effect, and MP4, PDF has been processed file format effect is not not obvious. But it's a good learning material for beginners.)