202. 快乐数

Code

class Solution:
    def isHappy(self, n: int) -> bool:
        def help(x):
            temp = list(map(int,[i for i in str(x)]))
            num = 0
            for i in temp:
                num += i ** 2
            return num
        arrive = set()
        while(True):
            if n in arrive:
                return False
            arrive.add(n)
            if n == 1:
                return True
            n = help(n)