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🧷 문제 링크
https://www.acmicpc.net/problem/19584
🧭 풀이 시간
60분
👀 체감 난이도
✏️ 문제 설명
도로의 통행량이 주어진다. 도로를 철거할 때, 통행량을 최대한 많이 막았다고 한다면 최대로 많이 막은 통행량을 출력하라.
🔍 풀이 방법
도로를 y기준으로 정렬하고 이벤트로 바꿔서 스위핑해 푼다.
⏳ 회고
스위핑은 투포인터와 다른 점이 있다. 어려운 스위핑은 '추가', '삭제' 처럼 각 행위를 이벤트로 처리해 해당 이벤트가 들어올 때마다 처리하는 방식을 사용한다.