[20251001] ETC / 삼성 SW 평가 기출 / 가로등 설치 / 이종환 #1016
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🧷 문제 링크
https://www.codetree.ai/ko/frequent-problems/samsung-sw/problems/street-light-installation/description
🧭 풀이 시간
120분
👀 체감 난이도
✏️ 문제 설명
문제가 굉장히 깁니다. 링크 참고 부탁드려요
🔍 풀이 방법
B형을 응시해본 사람이라면 익숙한 양식의 문제이다.
Node와, 두개의 Node로 구성된 Edge(길), 이렇게 두 개의 커스텀 클래스를 만들어서 문제에 접근하였다.
여기서의 핵심은 레이지하게 삭제를 적용한다는 것이다. PQ에 넣어놓은 것을 전부 꺼내서 지울 수 없으니, 삭제 요청이 들어오면 객체의 상태를 나타내는 isAlive만 false로 바꾸었다.
⏳ 회고
문제 제대로 안읽었다가 40분 날렸다... 집중했으면 한시간 컷 냈을수도...