—— 请按键盘 空白键 开始游戏 ——

不仅仅是广告,产品本身也必须有趣。
"Reading should not be presented to children as a chore or duty. It should be offered to them as a precious gift."
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。