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Kotlin-based LeetCode algorithm problem solutions, regularly updated
738\. Monotone Increasing Digits
Medium
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:**
**Input:** n = 10
**Output:** 9
**Example 2:**
**Input:** n = 1234
**Output:** 1234
**Example 3:**
**Input:** n = 332
**Output:** 299
**Constraints:**
* 0 <= n <= 109