Valid Perfect Square

Given a positive integer num, return true if num is a perfect square or false otherwise. A perfect square is an integer that is the square of an integer, meaning it is the product of some integer with itself. You must not use any built-in library function, such as sqrt.

Constraints

  • 1 <= num <= 2**31 - 1
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class Solution:
def isPerfectSquare(self, num: int) -> bool:
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