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Kotlin-based LeetCode algorithm problem solutions, regularly updated
367\. Valid Perfect Square
Easy
Given a **positive** integer _num_, write a function which returns True if _num_ is a perfect square else False.
**Follow up:** **Do not** use any built-in library function such as `sqrt`.
**Example 1:**
**Input:** num = 16
**Output:** true
**Example 2:**
**Input:** num = 14
**Output:** false
**Constraints:**
* `1 <= num <= 2^31 - 1`