[프로그래머스/파이썬] 3진법 뒤집기

-코드

def solution(num):
    answer = 0
    arr = list()
    while num:
        arr.append(num % 3)
        num //= 3
    arr.reverse()
    for i in range(len(arr)):
        answer += arr[i] * (3 ** i)
    return answer