'''

Write an algorithm to determine if a number is "happy".

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.

Example:

Input: 19

Output: true

Explanation:

12 + 92 = 82

82 + 22 = 68

62 + 82 = 100

12 + 02 + 02 = 1

'''

class Solution(object):

def isHappy(self, n):

"""

:type n: int

:rtype: bool

"""

s = set()

while n!= 1:

if n in s:

return False

s.add(n)

n = self.calculateSquare(n)

return True

def calculateSquare(self, n):

res = 0

while n:

v = n % 10

res += v * v

n = n/10

return res