LeetCode 263: Ugly Number

LeetCode Math

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.

代码

C语言版本：

bool isUgly(int num) {
    for (int i=2; i<6 && num; i++) {
        while (num % i == 0) {
            num /= i;
        }
    }
    return num == 1;
}

1012 / 1012 test cases passed.
Status: Accepted
Runtime: 4 ms