[20251116] PGM / LV2 / 게임 맵 최단거리 / 김민진

zinnnn37/202511/16 PGM LV2 게임 맵 최단거리.md

@@ -0,0 +1,68 @@
+```java
+import java.util.ArrayDeque;
+import java.util.Queue;
+
+public class PGM_LV2_게임_맵_최단거리 {
+
+    private static final int[] dx = { 0, 1, 0, -1 };
+    private static final int[] dy = { 1, 0, -1, 0 };
+
+    private static int N, M;
+    private static int[][]      map;
+    private static boolean[][]  visited;
+    private static Queue<Point> q;
+
+    private static class Point {
+
+        int x;
+        int y;
+        int cnt;
+
+        Point(int x, int y, int cnt) {
+            this.x = x;
+            this.y = y;
+            this.cnt = cnt;
+        }
+
+    }
+
+    private static boolean OOB(int x, int y) {
+        return x < 0 || N <= x || y < 0 || M <= y;
+    }
+
+    private static int bfs() {
+        q.offer(new Point(0, 0, 1));
+        visited[0][0] = true;
+
+        while (!q.isEmpty()) {
+            Point cur = q.poll();
+
+            if (cur.x == N - 1 && cur.y == M - 1) return cur.cnt;
+
+            for (int d = 0; d < 4; d++) {
+                int nx = cur.x + dx[d];
+                int ny = cur.y + dy[d];
+
+                if (OOB(nx, ny) || visited[nx][ny] || map[nx][ny] == 0) continue;
+
+                q.offer(new Point(nx, ny, cur.cnt + 1));
+                visited[nx][ny] = true;
+            }
+        }
+
+        return -1;
+    }
+
+    public int solution(int[][] maps) {
+        N = maps.length;
+        M = maps[0].length;
+
+        map = maps;
+        visited = new boolean[N][M];
+        q = new ArrayDeque<>();
+
+        return bfs();
+    }
+
+}
+```