用C自己写的prefixspan算法，输入输出都是对文本文件操作，能够正常运行，并显示了其投影过程中的步骤。-C write prefixspan algorithm, the input and output text file operations to normal operation, and shows the steps in the process of projection.

用c++实现的prefixspan算法 算法很简单 适合初学者-Used to achieve the prefixspan algorithm c++ algorithm is very simple for beginners