Fix 9-1.py 9-2.py #53
Merged
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책 써주셔서 감사합니다. 잘 보고 있습니다.
leetcode에 정답처리가 되긴 하지만 문제 정답 예시와 리턴 값의 타입힌트를 보면 이차원 리스트로 반환하는 것이 조금 더 맞을 것 같아서 수정했습니다.