LeetCode1012.Numbers With 1 Repeated Digit（至少有 1 位重复的数字）

Description

Given a positive integer N, return the number of positive integers less than or equal to N that have at least 1 repeated digit.

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给定正整数 N，返回小于等于 N 且具有至少 1 位重复数字的正整数。

题目链接：https://leetcode.com/problems/numbers-with-1-repeated-digit/

个人主页：http://redtongue.cn or https://redtongue.github.io/

Difficulty: hard

Example 1:

Input: 20
Output: 1
Explanation: The only positive number (<= 20) with at least 1 repeated digit is