2017年7月10日
自测-4 Have Fun with Numbers
摘要： Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135 阅读全文
posted @ 2017-07-10 19:36 白常福 阅读(596) 评论(0) 推荐(0) 编辑