—— 请按键盘 空白键 开始游戏 ——

The act of discovery is not reserved for the genius alone.
If you borrow something, try to return it in better shape than you received it. Clean it, sharpen it, fill it up.
You see, in life, lots of people know what to do, but few people actually do what they know. Knowing is not enough! You must take action.
计算复杂性的美在于它能够揭示问题的固有难度,而不管用于解决这些问题的具体算法是什么。