LeetCode-Ugly Number-解题报告

原链接 https://leetcode.com/problems/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.

分解质因素。

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