摘要: An army of ants walk on a horizontal pole of length l cm, each with a constant speed of 1 cm/s. When a walking ant reaches an end of the pole, it imme 阅读全文
posted @ 2020-04-14 22:18 ghosh 阅读(112) 评论(0) 推荐(0) 编辑
莫挨老子!