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🧷 문제 링크
https://www.acmicpc.net/problem/18869
🧭 풀이 시간
35분
👀 체감 난이도
✏️ 문제 설명
M개의 우주가 있고 각 우주에 N개의 행성이 있을 때, 균등한 우주 쌍의 개수를 구하는 문제
두 우주가 균등하다는 것은 모든 행성 쌍의 대소관계가 동일하다는 의미
🔍 풀이 방법
좌표압축을 활용
각 우주의 행성 크기를 상대적 순위(rank)로 변환하면, 균등한 우주는 동일한 rank 배열을 가진다
⏳ 회고
좌표압축을 생각못할뻔