Leetcode 263. Ugly Number JAVA语言
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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.
题意:判断一个数是不是丑数。只能被2,3,5因子的。
public class Solution { public boolean isUgly(int num) { if(num==0)return false; while(num%2==0){ num=num/2; } while(num%3==0){ num=num/3; } while(num%5==0){ num=num/5; } return num==1?true:false; } }
PS:直接做除法就行。
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