摘要: 题目描述: Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example:Given n = 2, return 91. (The answer should b 阅读全文
posted @ 2016-08-03 00:03 scottwang 阅读(244) 评论(0) 推荐(0) 编辑