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May-9 2020 Challenge



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9. Valid Perfect Square leetcode leetcode may challenge leetcode premium leetcode premium for free leetcode problems leetcode 200 leetcode dynamic programming leetcode login leetcode array leetcode amazon leetcode anagrams leetcode app leetcode api 

Given a positive integer num, write a function which returns True if num is a perfect square else False.
Note: Do not use any built-in library function such as sqrt.
Example 1:
Input: 16
Output: true
Example 2:
Input: 14
Output: false

Solution in Python:


 class Solution:
    def isPerfectSquare(self, num):
        left = 1
        right = num

         while left <= right:
            mid = left + (right - left) // 2
            square = mid * mid
            if square < num:
                left = mid + 1
            elif square > num:
                right = mid - 1
            else:
                return True

         return False


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