[20250210] BOJ / 골드4 / 펭귄의 하루 / 권혁준

Author: oncsr

khj20006/202502/10 BOJ G4 펭귄의 하루.md

@@ -0,0 +1,80 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+
+class Main {
+	
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+	static int[] dx = {1,0,-1,0};
+	static int[] dy = {0,1,0,-1};
+	
+	static char[][] arr;
+	static boolean[][][] vis;
+	static int N, M;
+	
+	public static void main(String[] args) throws Exception {
+		
+		ready();
+		solve();
+	
+		bwEnd();
+	}
+	
+	static void ready() throws Exception{
+		nextLine();
+		N = nextInt();
+		M = nextInt();
+		arr = new char[N][M];
+		vis = new boolean[N][M][2];
+		for(int i=0;i<N;i++) arr[i] = br.readLine().toCharArray();
+		
+	}
+	
+	static void solve() throws Exception{
+
+		for(int i=0;i<N;i++) for(int j=0;j<M;j++) if(arr[i][j] == 'S') {
+			bw.write(bfs(i,j)+"\n");
+			return;
+		}
+		
+	}
+	
+	static int bfs(int sx, int sy) throws Exception {
+		
+		Queue<int[]> Q = new LinkedList<>();
+		vis[sx][sy][0] = true;
+		Q.offer(new int[] {sx,sy,0,0});
+		
+		while(!Q.isEmpty()) {
+			int[] now = Q.poll();
+			int x = now[0], y = now[1], v = now[2], t = now[3];
+			if(arr[x][y] == 'H' && v == 1) return t;
+			
+			for(int i=0;i<4;i++) {
+				int xx = x+dx[i], yy = y+dy[i];
+				if(xx<0 || xx>=N || yy<0 || yy>=M || arr[xx][yy] == 'D') continue;
+				int vv = arr[xx][yy] == 'F' ? 1 : v;
+				if(vis[xx][yy][vv]) continue;
+				Q.offer(new int[] {xx,yy,vv,t+1});
+				vis[xx][yy][vv] = true;
+			}
+		}
+		return -1;
+		
+	}
+	
+}
+
+```