2016年12月2日
SCU3502 The Almost Lucky Number
摘要： Description A lucky number is a number whose decimal representation contains only the digits $4$ and $7$. An almost lucky number is a number that is d 阅读全文
posted @ 2016-12-02 23:20 lmxyy 阅读(190) 评论(0) 推荐(0) 编辑