—— 请按键盘 空白键 开始游戏 ——

通往善的道路就是通往真理的道路。
The best way to predict the future is to create it.
我唱歌不是为了完美,我唱歌是为了活着。
A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.