LeetCode----Ugly Number

最新推荐文章于 2019-01-17 20:27:09 发布

白熊花田

最新推荐文章于 2019-01-17 20:27:09 发布

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本文介绍了一种Python方法来判断一个数是否为丑数。丑数是指仅包含质因数2、3和5的正整数。文章提供了一个简单的Python类及方法，通过去除所有能被2、3和5整除的情况，最终判断剩余部分是否为1来确定输入的数是否为丑数。

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Ugly Number

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

分析：

简单题。

代码：

class Solution(object):
    def isUgly(self, num):
        """
        :type num: int
        :rtype: bool
        """
        if num <= 0:
            return False
        while num % 2 == 0:
            num = num / 2
        while num % 3 == 0:
            num = num / 3
        while num % 5 == 0:
            num = num / 5
        if num != 1:
            return False
        return True