A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.
创造力是允许自己犯错。艺术是知道该保留哪些错误。
创新不仅仅是关于新想法,而是以创造真正价值的方式去执行它们。
Great engineering is invisible—it just works seamlessly.