—— 请按键盘 空白键 开始游戏 ——

To write is to confront the ghosts of the past and give them a voice in the present.
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
The best songs come from real life experiences.
最好的数学是简单的,但又不至于过于简单。