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 程式師世界 >> 編程語言 >> C語言 >> C++ >> C++入門知識 >> [LeetCode] Ugly Number

[LeetCode] Ugly Number

編輯:C++入門知識

[LeetCode] Ugly Number


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.

解題思路

略。

實現代碼

Java:

// Runtime: 2 ms
public class Solution {
    public boolean isUgly(int num) {
        if (num == 0) {
            return false;
        }
        while (num % 2 == 0) {
            num /= 2;
        }
        while (num % 3 == 0) {
            num /= 3;
        }
        while (num % 5 == 0) {
            num /= 5;
        }

        return num == 1;
    }
}

 

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