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🧷 문제 링크
https://www.acmicpc.net/problem/17835
🧭 풀이 시간
10분
👀 체감 난이도
✏️ 문제 설명
N개의 도시와, 이들을 연결하는 단방향 도로 M개가 주어진다.
N개의 도시 중 K개의 도시에 면접장이 존재한다.
면접장까지의 거리가 가장 먼 도시를 구해보자.
🔍 풀이 방법
[사용한 알고리즘]
면접장이 배치된 도시들을 모두 시작점으로 두고 다익스트라를 수행한다.
면접장까지 도달하는 경로를 구하는 것이기 때문에, 그래프 간선은 역방향으로 바꾼다.
⏳ 회고
역방향 그래프를 떠올리는 것이 중요하다