[20251222] BOJ / G4 / 인문예술탐사주간 / 김민진 #1725
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🧷 문제 링크
인문예술탐사주간
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
나무가 있고 특정 위치에서 사진을 찍음
그 사진을 찍은 위치와 나무 위치의 차이의 합이 점수임
어디서 찍었는지 위치가 주어졌을 때 해당 위치에서의 점수를 출력하기
🔍 풀이 방법
이분탐색 + 누적합
찍은 위치보다 왼쪽은
현 위치 * 나무의 수 - prefix[현위치 바로 왼쪽 나무]찍은 위치보다 오른쪽은
왼쪽 제외한 누적합 - 현 위치 * 나무 수⏳ 회고
수 범위 확인해서 int 넘어가는지 확인하기