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2주차 문제 폴더에만 README.md 파일이 추가되어 있어서, 1주차와 3주차 폴더에도 README.md 파일을 추가합니다. 각 폴더에 문제와 해설에 대한 링크가 있으니 편하다는 피드백이 있었거든요.