[LeetCode] Ugly Number

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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.

解题思路:

题意为只有2、3、5三个因子的数成为Ugly Number。1也认为是Ugly Number。因此我们只需要不断的除以2/3/5即可(倘若能够整除)

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;    }};


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