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`