- assignment: Array of booleans. If the formula is satisfiable provide an assignment for each variable from 1 to N. If the formula is not satisfiable this field is null.
She found them easier to watch than the lengthy TV shows which would keep her up all night.
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每年南極夏季期間，約有5,000名人員在約30個國家運作的80個研究站工作。，更多细节参见safew官方下载
* @param arr 待排序数组
are to copy and to extend (append), with "slicing" being common enough that，推荐阅读WPS官方版本下载获取更多信息