The P versus NP problem is one of the most important unsolved problems in computer science.
生活就是被可能发生的事情的幽灵所困扰。
晏子春秋
The creative act is not pure. History evidences it. Ideology demands it. Society exacts it. The artist loses his freedom the moment he creates a work of art.
目标不是每次都正确,而是正确的次数比错误的次数多。