蓬草长在麻地里,不用扶它也能挺立;把白沙放在黑土里,白沙也就变成黑的了。这两个例子说明,环境对一个人的影响,是非常大的,所以才有了《孟母三迁》的故事。
Do not retreat in the face of difficulties, do not shirk responsibility.
"Books are the keys to understanding the world and ourselves."
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。