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。
真正活着的唯一方式,就是甘愿为某些东西献出生命。
"The past is a puzzle, and every piece matters."
爱就是失去,但我们仍然去爱。
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."