happy_number_floyds_algo.py

class Solution:
    def sum_of_squares(self, n: int) -> int:
        total = 0
        while n > 0:
            total += (n % 10) ** 2
            n = int(n / 10)
        return total
    
    def isHappy(self, n: int) -> bool:
        fast = self.sum_of_squares(n)
        while n != 1 and fast != 1:
            if n == fast:
                return False
            n = self.sum_of_squares(n)
            fast = self.sum_of_squares(self.sum_of_squares(fast))
        return True