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leetcode-263-Ugly Number
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.
推断一个数是否为丑数
class Solution {
public:
bool 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;
}
};
leetcode-263-Ugly Number
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