[20250704] BOJ / P5 / 전쟁 / 권혁준 #410
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🧷 문제 링크
https://www.acmicpc.net/problem/1228
🧭 풀이 시간
70분
👀 체감 난이도
✏️ 문제 설명
정점 N개인 포레스트가 주어진다.
정점 n을 정복하면, 해당 정점을 루트로 하는 서브트리의 모든 점들이 정복되고, 이 때의 비용은 C[n]이다.
적어도 M개의 점을 정복하기 위한 최소 비용을 구해보자.
🔍 풀이 방법
서로 다른 트리에 속하면 영향을 미치지 않지만, 같은 트리에서 겹치도록 두 서브트리를 고르는 것을 막아야 한다.
배낭 DP를 잘 짜주면 풀린다.
⏳ 회고
난 잘 못짜서 고생을 많이 했다