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八、实用指南：什么时候该用，怎么用基于这 120 多次实验的结果和三份调研报告，我整理了一份尽量务实的使用建议。
。新收录的资料是该领域的重要参考
习题链接：LeetCode 496. 下一个更大元素 I
but there’s a problem with the classical formulation. the derivative takes a regex and a character, so to build a state machine you need to compute it for every possible character to get all transitions from a given state. sure, you can compress the number of characters into equivalence classes before, but you still have to compute for each equivalence class - and many of them end up leading to the same state anyway. for example, the regex abc (below) cares about a, b, c, and “everything else”, which brings us down from 65536 to 4 in UTF-16, but for the first node (abc) even b and c behave the same as “everything else”. so what are we computing these for? in other words, there is something left to improve here.
圖像加註文字，伊朗已向包括以色列在內的鄰國發動報復性攻擊。專家認為，戰略終局仍高度不確定，且風險極高。