[Solved] Given a positive integer num, write a function which returns True if num is a perfect square else False.

Question

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

Python Solution

class Solution:
    def isPerfectSquare(self, num: int) -> bool:
        l=0
        r=num
        while l<=r:
            m = l+(r-l)//2
            if m*m == num:
                return True
                break
            elif m*m < num:
                l = m+1
            else:
                r= m-1
        return False 
Abhishek Sharma
Abhishek Sharma

Started my Data Science journey in my 2nd year of college and since then continuously into it because of the magical powers of ML and continuously doing projects in almost every domain of AI like ML, DL, CV, NLP.

Articles: 520

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