2016年11月4日
Frog Jump
摘要： A frog is crossing a river. The river is divided into x units and at each unit there may or may not exist a stone. The frog can jump on a stone, but i 阅读全文
posted @ 2016-11-04 22:09 北叶青藤 阅读(399) 评论(0) 推荐(0) 编辑