// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算）
Step 2: Route on the Abstract Graph (The "Highway" Part):
。业内人士推荐91视频作为进阶阅读
for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).
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