Leetcode 357. Count Numbers with Unique Digits | | Leetcode 357. Count Numbers with Unique Digits 文章作者:Tyan博客:noahsnail.com | CSDN | 简书 1. Description 2. Solution1234567891011121314class Solution {public: int countNumbersWithUniqueDigits(int n) { int total = 1; for(int i = 0; i < n; i++) { int count = 9; for(int j = 1; j <= i; j++) { count *= (10 - j); } total += count; } return total; }}; Reference https://leetcode.com/problems/count-numbers-with-unique-digits/description/ 如果有收获,可以请我喝杯咖啡! 赏 微信打赏 支付宝打赏