202.md

• 32ms
• 68%

class Solution:
    def isHappy(self, n: int) -> bool:
        visited = set()
        while True:
            if n in visited: return False
            if n==1: return True
            visited.add(n)
            tmp = 0
            while n:
                tmp += (n%10)**2
                n //= 10
            n = tmp