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다음주엔 더 빨리 제출 할 수 있도록 하겠습니다 ^^;
linked-list-cycle 문제는 왜 인진 모르겠으나 leet code에 elixir 선택이 불가능해서 제일 익숙한 언어인 ruby로 풀었습니다.