NP中的每个问题都可以归约为可满足性问题,这是计算复杂性理论的基石。
You have to believe in yourself when no one else does.
It’s funny. The things that are most important to you are often the hardest to talk about.
【译文】 孔子说:“君子不能象器皿一样,只有一种用途。”
Contentment is natural wealth,luxury is artificial poverty.