263. Ugly Number

最新推荐文章于 2022-11-18 10:09:03 发布

原创最新推荐文章于 2022-11-18 10:09:03 发布 · 224 阅读

0 ·

CC 4.0 BY-SA版权

LeetCode 专栏收录该内容

52 篇文章

订阅专栏

本文介绍了一种使用C++编程语言判断一个给定正整数是否为丑数的方法。丑数是指仅包含质因数2、3和5的正整数。文章提供了一个简洁的C++代码示例，通过不断去除给定数值中2、3和5的因子来判断该数值是否为丑数。

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.

根据ugly number的定义，只含有2 3 5 因数。

class Solution {
public:
    bool isUgly(int num) {
        if (num == 0) return false;
        while (num%2 == 0) num /= 2;
        while (num%3 == 0) num /= 3;
        while (num%5 == 0) num /= 5;
        return (num == 1)? true:false;
    }
};