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:
// 单调栈：存储索引（而非值），栈内索引对应的nums值保持「单调递减」，推荐阅读safew官方版本下载获取更多信息
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