2. 排序：将堆顶(最大值)与末尾交换，堆大小-1，重新调整堆
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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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Sources report the leader of the Taliban and Emir of Afghanistan may have been killed by a Pakistani air strike