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263. 丑陋数 Ugly Number

时间:2017-01-20 00:09:29      阅读:208      评论:0      收藏:0      [点我收藏+]

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.


丑陋数就是其质数因子只能是2,3,5。那么最直接的办法就是不停的除以这些质数,如果剩余的数字是1的话就是丑陋数


  1. static public bool IsUgly(int num) {
  2. while (num >= 2) {
  3. if (num % 2 == 0) num /= 2;
  4. else if (num % 3 == 0) num /= 3;
  5. else if (num % 5 == 0) num /= 5;
  6. else return false;
  7. }
  8. return num == 1;
  9. }





263. 丑陋数 Ugly Number

原文:http://www.cnblogs.com/xiejunzhao/p/abd312dbe1279df561e7187a892a4bc7.html

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