说明：  子集法实现NFA到DFA的转换，教学中给学生演示的。图用最简单的方法表示，非常便于理解。纯C代码，在windows和linux都可以编译运行
(Subset of the NFA to DFA conversion, teaching to the student demonstration. Figure easiest way, very easy to understand. Pure C code can be compiled to run in windows and linux)