Happy Number

Author: anantkaushik

202-happy-number.py

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+"""
+Problem Link: https://leetcode.com/problems/happy-number/
+
+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
+        """
+        while n > 6:
+            nextN = 0
+            while(n):
+                nextN += (n%10) * (n%10)
+                n //= 10
+            n = nextN
+        return n == 1