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🧷 문제 링크
https://www.acmicpc.net/problem/14846
🧭 풀이 시간
15분
👀 체감 난이도
✏️ 문제 설명
N×N 행렬에서 주어진 직사각형 영역 내 서로 다른 정수의 개수 구하기
🔍 풀이 방법
boolean[11] 배열로 중복 체크, 각 쿼리마다 순회하며 중복 제거 후 카운트
값의 범위가 작으니까 그냥 boolean 배열로
⏳ 회고
set 쓰면 오히려 터질거같음