每一层都有对应的工具在支撑。下面逐个介绍。
// 入栈后栈仍保持单调递增（因为小的都被弹走了）
，这一点在服务器推荐中也有详细论述
DFA construction is O(2^m) in the worst case, where m is the size of the NFA. this is widely known in academic circles, but in practice, most people think well of DFAs because they are used in tools like grep that are optimized for the common case. but if you throw a large regex at them, they will blow up in size and become unusable. DFA matching is linear O(n) where n is the size of the input, and the constant is ~3-4 assembly instructions per character - faster than anything you could write by hand.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
Reporter, Venture