LeetCode:Ugly Number

Ugly Number

Total Accepted: 59402  Total Submissions: 160149  Difficulty: Easy

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.

Subscribe to see which companies asked this question

Hide Tags

  Math

Hide Similar Problems

  (E) Happy Number (E) Count Primes (M) Ugly Number II

c++ code:

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