leetcode------Happy Number

标题：	Happy Number
通过率：	34.3%
难度：	简单

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: 19 is a happy number

• 12 + 92 = 82
• 82 + 22 = 68
• 62 + 82 = 100
• 12 + 02 + 02 = 1

用一个list去记录数字是否存在过，然后一直循环，只会出现两种情况，要么在list中出现过，要等于1，直接看代码：

class Solution:
    # @presaram {integer} n
    # @return {boolean}
    def isHappy(self, n):
        map=[]
        while True:
            map.append(n)
            n=self.divideNum(n)
            if n==1:return True
            elif n in map:return False
    
    def divideNum(self,n):
        res=0
        while n/10 != 0:
            res=res+int(math.pow(n%10,2))
            n=n/10
        res=res+int(math.pow(n,2))
        return res