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🧷 문제 링크
https://www.acmicpc.net/problem/1595
🧭 풀이 시간
55 분
👀 체감 난이도
✏️ 문제 설명
🔍 풀이 방법
트리의 지름: 1. 어느 한 점에서 bfs로 최장거리 가지는 노드 번호p 구하기 / 2. p에서 똑같이 bfs로 최장거리 구하기 그것이 트리의 지름⏳ 회고
putIfAbsent()사용 습관화하기모든 두 정점간의 경로가 유일한 그래프 === 트리임을 기억하기