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.
Llama 4 折戟之后,扎克伯格憋着一口气,要重新打造一支「超级智能」梦之队,为此几乎是不计成本地砸钱、砸资源、砸人脉。
Nicolás Urdaneta。业内人士推荐服务器推荐作为进阶阅读
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