1012. Numbers With Repeated Digits
Given an integer n, return the number of positive integers in the range [1, n] that have at least one repeated digit.
Examples
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