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
Credits:Special thanks to @elmirap for adding this problem and creating all test cases.
class Solution:
     def isPerfectSquare(self, num):
         sign = True
         i = 1
         while(sign):
             if(num == i * i):
                 return True
             elif(num > i * i):
                 i = i + 1
             else:
                 return False

class Solution:
     def isPerfectSquare(self, num):
         sign = True
         i = 1
         while(sign):
             if(num == i * i):
                 return True
             elif(num > i * i):
                 i = i + 1
             else:
                 return False
