"""
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
Returns: True
Example 2:

Input: 14
Returns: False
"""
class Solution:
    def isPerfectSquare(self, num):
        """
        :type num: int
        :rtype: bool
        """
        i = 1
        while i <= num // i:
            if i * i == num:
                return True
            i += 1
        return False

obj = Solution()
print(obj.isPerfectSquare(14))