[20251129] BOJ / G4 / 직사각형과 쿼리 / 김민진 #1539
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🧷 문제 링크
직사각형과 쿼리
🧭 풀이 시간
40분
👀 체감 난이도
✏️ 문제 설명
(x1, y1) ~ (x2, y2) 사이에 중복되지 않은 숫자의 갯수
🔍 풀이 방법
3차원 누적합
숫자가 얼마나 있는지 계산해서 해당 숫자마다 2차원 누적합 공식 적용하면 됨
⏳ 회고
또 풀고 제출 안 함 아