Ugly Number

描述

Write a function 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.

分析

思路很简单，把n里面的2,3,5 全部消掉，看最后能不能剩下1。

代码

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原文: https://soulmachine.gitbooks.io/algorithm-essentials/content/cpp/number-theory/ugly-number.html