문제
3차원 공간의 세 축 중 하나에 평행한 직사각형이 N개 있다.
적어도 한 점을 공유하는 직사각형 쌍의 개수를 구하는 프로그램을 작성하시오.
출력
첫째 줄에 적어도 한 점을 공유하는 직사각형 쌍의 개수를 출력한다.
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