This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
（九）向人民政府或者街道办事处反映居民的意见、要求和提出建议。
，这一点在一键获取谷歌浏览器下载中也有详细论述
int pivotIdx = partition(arr, low, high); // 分区并获取pivot位置
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