有意思的是，在TOP榜单中，国际美妆企业业绩呈现阶梯式分布。欧莱雅以年营收超3500亿元的成绩遥遥领先，宝洁、联合利华、雅诗兰黛业绩仅差50亿元，均在1000+亿元，拜尔斯道夫与LVMH集团的业绩在同一水平，资生堂、PUIG、科蒂则在年营收400+亿元的阵营扎堆，而十强门外的科赴，成了LG生活健康需要严防死守的对手之一。
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。关于这个话题，纸飞机下载提供了深入分析
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.
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