�ش� ĭ�� ���� ���ο� �����ϴ� ĭ���� �˻��ϴ� �ҵ� @param r @param c @return (r, c)�� ���� �� ��ȿ�� ĭ�̸� true, �ƴϸ� false
(int r, int c)
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no outgoing calls
no test coverage detected