12943 콜라츠 추측

 

📖 question

https://school.programmers.co.kr/learn/courses/30/lessons/12943/solution_groups?language=python3 

프로그래머스

 

✍️ answer

def solution(num):
    count = 0
    while num != 1:
        count +=1
        if count == 500:
            return -1
        else:
            num = num//2 if num % 2 == 0 else num * 3 + 1
    return count