[Level 1] / [Python] 3진법 뒤집기

https://school.programmers.co.kr/learn/courses/30/lessons/68935

프로그래머스

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def solution(n):
    answer=0

    s=[]

    while n != 0:
        s.append(n % 3)
        n //= 3
    
    for i in range(1,len(s)+1):
        answer += s[-i] * 3 ** (i-1)
        
    return answer