秘鲁经济曾经历一段真正的黄金时期,国际媒体一度把它称为“拉美明星”“安第斯之虎”。一切似乎都在向好,但好景不长。2013年前后,增长开始明显放缓:2001—2013年GDP年均增长约6.1%,而2013—2019年却降至约3.1%,几乎腰斩。
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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:,推荐阅读夫子获取更多信息