LeetCode 263. Ugly Number
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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.
class Solution {public: bool isUgly(int num) { if(num <= 0) return false; while(num%5 == 0) num /= 5; while(num%3 == 0) num /= 3; while(num%2 == 0) num /= 2; return num == 1; }};
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