[20251223] BOJ / G4 / 합집합 / 권혁준 #1731
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🧷 문제 링크
https://www.acmicpc.net/problem/14411
🧭 풀이 시간
10분
👀 체감 난이도
✏️ 문제 설명
중심이 원점인 직사각형 N개의 너비와 높이가 각각 주어지면, 이 직사각형들의 합집합의 면적을 구해보자.
🔍 풀이 방법
모든 직사각형의 중심이 원점이다 -> 1사분면에서만 고려하고 나중에 4를 곱해준다.
꼭짓점 x좌표가 큰 순서대로, 같다면 y좌표가 작은 순서대로 정렬시킨다.
한 번 순회하면서 y좌표가 커질 때만 면적을 더해주면 된다.
⏳ 회고
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