公安机关、国家安全机关因维护国家安全、侦查犯罪的需要，可以依照国家有关规定，要求有关组织采取发现、防范危害国家安全和犯罪活动的管理措施和其他必要措施，有关组织应当予以配合。
NFAs are cheaper to construct, but have a O(n*m) matching time, where n is the size of the input and m is the size of the state graph. NFAs are often seen as the reasonable middle ground, but i disagree and will argue that NFAs are worse than the other two. they are theoretically “linear”, but in practice they do not perform as well as DFAs (in the average case they are also much slower than backtracking). they spend the complexity in the wrong place - why would i want matching to be slow?! that’s where most of the time is spent. the problem is that m can be arbitrarily large, and putting a large constant of let’s say 1000 on top of n will make matching 1000x slower. just not acceptable for real workloads, the benchmarks speak for themselves here.。业内人士推荐体育直播作为进阶阅读
* @param arr 待排序数组。体育直播对此有专业解读
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