[20250905] BOJ / G4 / 트리 / 이강현 #822
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🧷 문제 링크
https://www.acmicpc.net/problem/4803
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
주어진 그래프에서 트리의 개수를 출력.
🔍 풀이 방법
분리 집합
간선단위로 union을 진행하고 루트가 같은 경우에는 사이클 set에 저장해둠.
트리의 개수를 셀때, 루트의 개수를 센 후, 사이클 set의 정점을 가지고 있는 루트는 제거.
⏳ 회고
그렇게 어려운 문제는 아니었으나, 생각이 꼬여 오래걸린듯