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🧷 문제 링크
https://www.acmicpc.net/problem/14846
🧭 풀이 시간
60분
👀 체감 난이도
✏️ 문제 설명
(x1, y1), (x2, y2) 영역에 포함되어 있는 서로 다른 정수의 개수 출력
🔍 풀이 방법
각 셀의 정수의 개수를 누적합으로 저장하고,
sum[x2][y2][i] - sum[x1-1][y2][i] - sum[x2][y1-1][i] + sum[x1-1][y1-1][i]로 계산⏳ 회고
누적합 나한텐 어렵다.