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 @ 2016-10-06 17:23 Sheryl Wang 阅读(185) 评论(0) 推荐(0) 编辑
