—— 请按键盘 空白键 开始游戏 ——

无论生活多么困难,总有一些事情你可以做并且成功。
However difficult life may seem, there is always something you can do and succeed at.
A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.
保持好奇,保持活力。
By used books. They have the same words as the new ones. Also libraries.
Sustainability isn't a choice—it's our responsibility to the next generation.