[20250826] BOJ / G5 / 게임 / 이강현

lkhyun/202508/26 BOJ G5 게임.md

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+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+
+    static int[][] map = new int[501][501];
+    static int[][] dist = new int[501][501];
+    static int[] dx = {0, 0, -1, 1};
+    static int[] dy = {1, -1, 0, 0};
+
+    public static void main(String[] args) throws IOException {
+        for (int[] row : dist) Arrays.fill(row, Integer.MAX_VALUE);
+
+        int n = Integer.parseInt(br.readLine());
+        for (int i = 0; i < n; i++) {
+            st = new StringTokenizer(br.readLine());
+            int x1 = Integer.parseInt(st.nextToken());
+            int y1 = Integer.parseInt(st.nextToken());
+            int x2 = Integer.parseInt(st.nextToken());
+            int y2 = Integer.parseInt(st.nextToken());
+
+            for (int x = Math.min(x1, x2); x <= Math.max(x1, x2); x++) {
+                for (int y = Math.min(y1, y2); y <= Math.max(y1, y2); y++) {
+                    map[x][y] = 1;
+                }
+            }
+        }
+
+        int m = Integer.parseInt(br.readLine());
+        for (int i = 0; i < m; i++) {
+            st = new StringTokenizer(br.readLine());
+            int x1 = Integer.parseInt(st.nextToken());
+            int y1 = Integer.parseInt(st.nextToken());
+            int x2 = Integer.parseInt(st.nextToken());
+            int y2 = Integer.parseInt(st.nextToken());
+
+            for (int x = Math.min(x1, x2); x <= Math.max(x1, x2); x++) {
+                for (int y = Math.min(y1, y2); y <= Math.max(y1, y2); y++) {
+                    map[x][y] = 2;
+                }
+            }
+        }
+
+        int result = BFS();
+        bw.write(String.valueOf(result));
+        bw.close();
+    }
+
+    private static int BFS() {
+        ArrayDeque<int[]> q = new ArrayDeque<>();
+        dist[0][0] = 0;
+        q.add(new int[]{0, 0});
+
+        while (!q.isEmpty()) {
+            int[] cur = q.poll();
+            int x = cur[0], y = cur[1];
+
+            for (int i = 0; i < 4; i++) {
+                int nx = x + dx[i];
+                int ny = y + dy[i];
+
+                if (nx < 0 || nx > 500 || ny < 0 || ny > 500 || map[nx][ny] == 2) continue;
+
+                int newDist = dist[x][y] + map[nx][ny];
+                if (newDist < dist[nx][ny]) {
+                    dist[nx][ny] = newDist;
+                    if (map[nx][ny] == 0) q.addFirst(new int[]{nx, ny});
+                    else q.addLast(new int[]{nx, ny});
+                }
+            }
+        }
+
+        return dist[500][500] == Integer.MAX_VALUE ? -1 : dist[500][500];
+    }
+}
+```