[프로그래머스/Java] 콜라츠 추측

-Code

class Solution {
    public int solution(int num) {
        int answer = 0;
        while (num > 1) {
            num = num % 2 == 0 ? num / 2 : num * 3 + 1;
            answer++;
        }

        return num == 1 ? answer : -1;
    }
}