摘要: Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer shoul 阅读全文
posted @ 2019-07-05 18:15 小白兔云 阅读(115) 评论(0) 推荐(0) 编辑