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🧷 문제 링크
https://school.programmers.co.kr/learn/courses/30/lessons/181188
🧭 풀이 시간
15분
👀 체감 난이도
✏️ 문제 설명
각 미사일의 비행 구간 (s, e)가 주어질 때, 모든 미사일을 요격하기 위해 필요한 최소 미사일 발사 횟수를 구하는 문제
🔍 풀이 방법
구간의 끝점 e 기준으로 오름차순 정렬한 뒤, 이전 요격 지점이 다음 미사일의 시작 s 이상일 때 새로 미사일을 발사하는 그리디 알고리즘을 적용했다.
⏳ 회고
미사일의 비행 구간 (s, e)이 개구간이라는 것에 유의해야 한다. s 초과 e 미만인 곳에서만 요격 가능하므로 다음 미사일의 start가 e ‘이상’이면 새로운 요격 미사일을 발사해야 한다.