[20250407] BOJ / P3 / 수열과 쿼리 1 / 신희을 #299
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🧷 문제 링크
https://www.acmicpc.net/problem/13537
🧭 풀이 시간
100 분
👀 체감 난이도
✏️ 문제 설명
길이가 N인 수열 A1, A2, ..., AN이 주어진다. 이때, 다음 쿼리를 수행하는 프로그램을 작성하시오.
i j k: Ai, Ai+1, ..., Aj로 이루어진 부분 수열 중에서 k보다 큰 원소의 개수를 출력한다.
🔍 풀이 방법
다음과 같이 머지 소트 트리를 구성하고, 탐색 쿼리에서 이분 탐색을 하여, k보다 큰 수의 갯수를 반환한다.
⏳ 회고
머지 소트 트리 연습 문제. 벼르고 벼르다 드디어 풀었다.