[20250203] BOJ / 골드4 / 미로만들기 / 권혁준

khj20006/202502/03 BOJ G4 미로만들기.md

@@ -0,0 +1,72 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+class Node{
+	int x, y, c;
+	Node(int x, int y, int c){
+		this.x = x;
+		this.y = y;
+		this.c = c;
+	}
+}
+
+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
+
+	public static void main(String[] args) throws Exception {
+
+		int[] dx = {1,0,-1,0};
+		int[] dy = {0,1,0,-1};
+
+		nextLine();
+		int N = nextInt();
+		char[][] arr = new char[N][N];
+
+		for(int i=0;i<N;i++) {
+			String line = br.readLine();
+			for(int j=0;j<N;j++) arr[i][j] = line.charAt(j);
+		}
+
+		Deque<Node> Q = new ArrayDeque<>();
+		boolean[][] vis = new boolean[N][N];
+		vis[0][0] = true;
+		Q.offerFirst(new Node(0,0,0));
+
+		while(!Q.isEmpty()) {
+
+			Node now = Q.pollFirst();
+			if(now.x == N-1 && now.y == N-1) {
+				bw.write(now.c + "\n");
+				bwEnd();
+				return;
+			}
+
+			for(int i=0;i<4;i++) {
+				int x = now.x + dx[i], y = now.y + dy[i];
+				if(x<0 || x>=N || y<0 || y>=N || vis[x][y]) continue;
+				vis[x][y] = true;
+				if(arr[x][y] == '0') Q.offerLast(new Node(x,y,now.c+1));
+				else Q.offerFirst(new Node(x,y,now.c));
+			}
+
+		}
+
+		bwEnd();
+	}
+
+}
+
+```