Lazy DFAs (2010) are a clever optimization to mitigate the O(2^m) blowup of DFA construction, by only constructing the states that you actually visit. lazy DFAs reduce the theoretical automata construction time to either O(2^m) or O(n), whichever is lower. you could argue that it’s theoretically no longer linear time, since you could have a regex that creates a new state for every character in the input, but in practice you will keep revisiting the same states. for all intents and purposes it behaves more like O(n) with some initial wind-up time. the main downside of lazy DFAs is that they are more complex to implement, and you have to ship a compiler as part of your regex algorithm. i want to highlight Rust regex and RE2 as excellent implementations of this approach, which you can also see in the benchmarks.
Ранее Московский автомобильный завод «Москвич» официально представил две новые модели и озвучил их стоимость. Речь о кроссоверах «Москвич М70» и «Москвич М90».。体育直播是该领域的重要参考
。体育直播对此有专业解读
Фото: Екатерина Якель / «Лента.ру»
input = ""。关于这个话题，Safew下载提供了深入分析