[20260306] BOJ / G5 / 보물섬 / 이인희

Author: LiiNi-coder

LiiNi-coder/202603/06 BOJ 보물섬.md

@@ -0,0 +1,67 @@
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class Main{
+	private static int N;
+	private static int M;
+	private static char[][] Map;
+	private static final int[][] Drdcs = {
+		{1,0},{-1,0},{0,1},{0,-1}
+	};
+
+	public static void main(String[] args)throws IOException{
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		String[] temp = br.readLine().split(" ");
+		N = Integer.parseInt(temp[0]);
+		M = Integer.parseInt(temp[1]);
+
+		Map = new char[N][M];
+		for(int i=0; i<N; i++){
+			Map[i] = br.readLine().toCharArray();
+		}
+		int answer = 0;
+		for(int r=0; r<N; r++){
+			for(int c=0; c<M; c++){
+				if(Map[r][c]=='L'){
+					answer = Math.max(answer, bfs(r,c));
+				}
+			}
+		}
+		System.out.println(answer);
+	}
+
+	private static int bfs(int sr,int sc){
+		boolean[][] visited = new boolean[N][M];
+		Deque<int[]> q = new ArrayDeque<int[]>();
+
+		q.offer(new int[]{sr, sc, 0});
+		visited[sr][sc] = true;
+
+		int maxDist = 0;
+
+		while(!q.isEmpty()){
+			int[] qItem = q.poll();
+			int r = qItem[0];
+			int c = qItem[1];
+			int dist = qItem[2];
+			maxDist = Math.max(maxDist, dist);
+
+			for(int i=0; i<4; i++){
+				int nr = r + Drdcs[i][0];
+				int nc = c + Drdcs[i][1];
+				if(nr<0 || nc<0|| nr>=N || nc>=M)continue;
+				if(visited[nr][nc])continue;
+				if(Map[nr][nc]=='W')continue;
+
+				visited[nr][nc] = true;
+				q.offer(new int[]{nr, nc, dist+1});
+			}
+		}
+
+		return maxDist;
+	}
+}
+```