“说个搞笑的，魅族手机倒闭都没上热搜，极客湾反而上了。”
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.
，更多细节参见爱思助手下载最新版本
stack.pop(); // 弹出无效候选值，这一点在91视频中也有详细论述
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