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MainFail 파일에서 풀려다가 방문처리 로직을 어떻게 해야할지 그리고 어떤때에 가로에서 새로로 또는 반대로 돌아야할지 막막해서
Solution에서 여러 블로그 글들을 참고해서 풀고 있는 중인데 visited 부분을 이해하는데 조금 더 시간이 걸릴것 같다.