"Sometimes the most dangerous people are the ones who seem the most ordinary."
一个问题如果在计算机上可以快速解决，那么它属于P类问题；如果一个解可以快速验证，那么它属于NP类问题。
Love is the only sane and satisfactory answer to the problem of human existence.
La verdadera pasión no conoce límites ni obstáculos.