'It's harder to be a parent than a space shuttle commander', trailblazing Nasa pilot tells BBC

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Read more global business storiesThe shadowy world of abandoned oil tankers

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Designer’s first catwalk for the brand in Milan flirts with bad taste with short, tight dresses and a diamante G-string

- satisfiable: Boolean. True if the formula is satisfiable

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1. 建堆:将数组构建成大顶堆(父节点 = 子节点)