public class Solution
extends Object
1012 - Numbers With Repeated Digits\.
Hard
Given an integer `n`, return _the number of positive integers in the range_ `[1, n]` _that have **at least one** repeated digit_.
**Example 1:**
**Input:** n = 20
**Output:** 1
**Explanation:** The only positive number (<= 20) with at least 1 repeated digit is 11.
**Example 2:**
**Input:** n = 100
**Output:** 10
**Explanation:** The positive numbers (<= 100) with atleast 1 repeated digit are 11, 22, 33, 44, 55, 66, 77, 88, 99, and 100.
**Example 3:**
**Input:** n = 1000
**Output:** 262
**Constraints:**
* 1 <= n <= 109