Никита Абрамов (Редактор отдела «Россия»)
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Producer: Ben Ellman
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:
横琴岛地处广东省珠海市南端。海风阵阵，仿佛拨动琴弦。琴澳和鸣，奏响粤澳合作的华彩乐章。