本文主要是介绍LeetCode-Ugly Number,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
国电结束了,终于又有时间来刷题了,不过,这么多天不刷,有点不想再刷了的感觉。
今天来一道简单的,寻找丑数。
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.
也就是说丑数的因子只能含有2,3,5中的一个或者多个,不能有其他数。
打算用递归来实现
class Solution {
public:bool isUgly(int num) {if(num == 0) return false;if(num % 2 == 0) {num /= 2;num = isUgly(num);}else if(num % 3 == 0) {num /= 3;num = isUgly(num);}else if(num % 5 == 0) {num /= 5;num = isUgly(num);}if(num == 1) return true;else return false;}
};
不过感觉这里用递归不是很好。
在网上找了一下,发现大多数是这样实现的
bool IsUgly(int number)
{ while(number % 2 == 0) number /= 2; while(number % 3 == 0) number /= 3; while(number % 5 == 0) number /= 5; if(number == 1) return true; else return false;
}
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