摘要： 1. 题目描述 2. 代码 1 class Solution: 2 def isPowerOfThree(self, n: int) -> bool: 3 while n > 2 and n % 3 == 0: 4 n = n // 3 5 return n == 1 阅读全文

摘要： 1. 题目描述 2. 代码 1 class Solution: 2 def countPrimes(self, n: int) -> int: 3 nfilter = [False] * n 4 count = 0 5 for i in range(2,n): 6 if nfilter[i]:#非素 阅读全文

摘要： 1. 题目描述 2. 代码 1 class Solution: 2 def isHappy(self, n: int) -> bool: 3 s = set([n]) 4 while n != 1: 5 sn = str(n) 6 sums = 0 7 for i in range(len(sn)) 阅读全文