Lv1. 콜라츠 추측

▶ 문제

 

▶풀이방법

function solution(num) {
    var answer = 0;
    while(num > 1){
        if(num % 2 == 0) num /= 2;
        else num = num * 3 + 1;
        answer++;
        if(answer > 500){
            answer = -1; 
            break;
        } 
    }
    return answer;
}