[20250320] BOJ / G1 / 버스 갈아타기 / 권혁준 #278
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🧷 문제 링크
https://www.acmicpc.net/problem/2536
🧭 풀이 시간
49분
👀 체감 난이도
✏️ 문제 설명
M*N의 격자에 어떤 선분 K개를 각각 K개의 버스가 다니고 있다.
출발점과 도착점이 주어지면, 이용해야 하는 최소 버스 수를 구해보자.
🔍 풀이 방법
[사용한 알고리즘]
모든 버스 쌍에 대해 교차 판정 수행한 뒤에 그래프를 구성해준다.
시작점과 도착점을 포함하는 버스들을 미리 전처리 해놓고 BFS를 돌려주었다.
⏳ 회고
인접 리스트로 구성하니까 메모리 초과가 떴고,
인접 행렬로 다시 짜니까 맞았다..