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Kotlin-based LeetCode algorithm problem solutions, regularly updated
1556\. Thousand Separator
Easy
Given an integer `n`, add a dot (".") as the thousands separator and return it in string format.
**Example 1:**
**Input:** n = 987
**Output:** "987"
**Example 2:**
**Input:** n = 1234
**Output:** "1.234"
**Constraints:**
* 0 <= n <= 231 - 1