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Queue를 사용하여 풀었습니다.
신기한 점은
동일한 알고리즘을 list 로 풀었을때는 시간초과가 되었습니다.
하지만, from collections import deque 하여
list를 deque로 변형만 해줘도 시간초과가 발생하지 않았습니다.