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🧷 문제 링크
https://www.acmicpc.net/problem/2836
🧭 풀이 시간
90분
👀 체감 난이도
✏️ 문제 설명
주어진 영역을 어떻게 잘 병합할 것인가?
🔍 풀이 방법
순방향 사람은 고려안해도 된다. 어차피 M이다. 보트에 N명을 태울 수 있기 때문이다. 역방향 부분을 병합해서, 하나의 길이로 만들고$M + 역방향 부분 * 2$ 해야 한다.
⏳ 회고
N명을 태울 수 있어서 순방향일 때 M이라는 사실을 생각하지 못하고 어렵게 돌아갔다. 순방향의 cost가 M인 것만 알면 역방향 부분을 병합할 생각을 할 수 있다.