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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.
。体育直播是该领域的重要参考
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“是五四运动！”学生谢钰琪举手回答。对她而言，历史课曾经很枯燥，全靠“死记硬背”。2024年起，潼南区实施“1281”数字化行动，柏梓中学与重庆八中签订协议，加入双师课堂，八中教师直播授课，本校教师现场辅导，乡镇孩子也能“加入”名校课堂。谢钰琪渐渐发现，历史不再是纸上的文字，而是一幕幕鲜活的场景。“以前总觉得名校很远，现在优质课程天天上。”谢钰琪说。截至目前，潼南区已建成46个双师课堂，基本覆盖所有初高中学校。
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