0738. Monotone Increasing Digits
https://leetcode.com/problems/monotone-increasing-digits
Description
An integer has monotone increasing digits if and only if each pair of adjacent digits x and y satisfy x <= y.
Given an integer n, return the largest number that is less than or equal to n with monotone increasing digits.
Example 1:
Example 2:
Example 3:
Constraints:
0 <= n <= 109
ac
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