2017年10月13日
1023. Have Fun with Numbers (20)
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 @ 2017-10-13 09:27 gaoren 阅读(494) 评论(0) 推荐(0) 编辑