0263. Ugly Number

263. Ugly Number #

题目 #

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.

Example 1:


Input: 6
Output: true
Explanation: 6 = 2 × 3

Example 2:

Input: 8
Output: true
Explanation: 8 = 2 × 2 × 2

Example 3:


Input: 14
Output: false 
Explanation: 14 is not ugly since it includes another prime factor 7.

Note:

  • 1 is typically treated as an ugly number.
  • Input is within the 32-bit signed integer range: [−2^31, 2^31 − 1].

题目大意 #

判断一个数字是否是“丑陋数字”,“丑陋数字”的定义是一个正数,并且因子只包含 2,3,5 。

解题思路 #

依照题意要求做即可。

代码 #


package leetcode

func isUgly(num int) bool {
	for i := 2; i < 6 && num > 0; i++ {
		for num%i == 0 {
			num /= i
		}
	}
	return num == 1
}


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