https://programmers.co.kr/learn/courses/30/lessons/68935
단순 구현 문제
def solution(n):
answer = 0
temp = []
while n > 0:
temp.append(n % 3)
n = n // 3
temp.reverse()
for i in range(len(temp)):
answer = answer + temp[i] * (3 ** i)
return answer