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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Steven Vaughan-Nichols, Senior Contributing EditorSenior Contributing Editor
// 步骤4：扩展左边界（向左找所有minVal的元素，全程不越界）