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There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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25年里，她手下的小姐有的嫁人生baby，有的分手后又回来做小姐，更多人，从这行走出后就再不跟她做朋友了，怕男朋友或老公知道自己以前当过小姐。
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* 解题思路：先对nums2用单调栈求每个元素的下一个更大值，存入Map缓存；再遍历nums1直接查Map得结果