Count Numbers with Unique Digits
摘要：
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 be the 阅读全文
posted @ 2016-06-15 10:28 luckygxf 阅读(363) 评论(0) 推荐(0) 编辑
