输入一个正则表达式，输出相应的NFA图，NFA转换为DFA（得到的DFA图要求用画图方法完成并要求先产生子集构造表出来再画DFA图），DFA最小化（也要求用画图方法完成）

-Enter a regular expression, the output corresponding NFA map, NFA is converted to DFA (the DFA plans to be asked to use drawing methods and called for the first table structure generated by a subset of re-painting DFA graph), DFA minimization (also requires drawing method)