[20250927] BOJ / P5 / 안대 낀 스피드러너 / 한종욱

Ukj0ng/202509/27 BOJ P5 안대 낀 스피드러너.md

@@ -0,0 +1,113 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static final int[] dx = {1, 0, -1, 0};
+    private static final int[] dy = {0, 1, 0, -1};
+    // 0: 아래, 1: 오른쪽, 2: 위, 3: 왼쪽
+    private static int[][] map;
+    private static boolean[][][][][][] visited;
+    private static int N;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        int answer = BFS();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        map = new int[N][N];
+        visited = new boolean[N][N][4][N][N][4];
+
+        for (int i = 0; i < N; i++) {
+            char[] input = br.readLine().toCharArray();
+            for (int j = 0; j < N; j++) {
+                if (input[j] == 'H') {
+                    map[i][j] = 1;
+                }
+            }
+        }
+    }
+
+    private static int BFS() {
+        Queue<int[]> q = new ArrayDeque<>();
+        int time = 0;
+        visited[N-1][0][1][N-1][0][2] = true;
+        q.add(new int[] {N-1, 0, 1, N-1, 0, 2, 0});
+
+        while (!q.isEmpty()) {
+            int[] current = q.poll();
+
+            if (current[0] == 0 && current[1] == N-1 && current[3] == 0 && current[4] == N-1) {
+                time = current[6];
+                break;
+            }
+
+            int nx1, ny1, nx2, ny2;
+            int dir1, dir2;
+
+            if (current[0] == 0 && current[1] == N-1) {
+                nx1 = current[0];
+                ny1 = current[1];
+            } else {
+                nx1 = current[0] + dx[current[2]];
+                ny1 = current[1] + dy[current[2]];
+            }
+
+            if (current[3] == 0 && current[4] == N-1) {
+                nx2 = current[3];
+                ny2 = current[4];
+            } else {
+                nx2 = current[3] + dx[current[5]];
+                ny2 = current[4] + dy[current[5]];
+            }
+
+            if (OOB(nx1, ny1) || map[nx1][ny1] == 1) {
+                nx1 = current[0];
+                ny1 = current[1];
+            }
+
+            if (OOB(nx2, ny2) || map[nx2][ny2] == 1) {
+                nx2 = current[3];
+                ny2 = current[4];
+            }
+
+            if (!visited[nx1][ny1][current[2]][nx2][ny2][current[5]]) {
+                visited[nx1][ny1][current[2]][nx2][ny2][current[5]] = true;
+                q.add(new int[] {nx1, ny1, current[2], nx2, ny2, current[5], current[6]+1});
+            }
+
+            dir1 = (current[2]+1) % 4;
+            dir2 = (current[5]+1) % 4;
+
+            if (!visited[current[0]][current[1]][dir1][current[3]][current[4]][dir2]) {
+                visited[current[0]][current[1]][dir1][current[3]][current[4]][dir2] = true;
+                q.add(new int[] {current[0], current[1], dir1, current[3], current[4], dir2, current[6]+1});
+            }
+
+            dir1 = current[2]-1 < 0 ? 3 : current[2]-1;
+            dir2 = current[5]-1 < 0 ? 3 : current[5]-1;
+
+            if (!visited[current[0]][current[1]][dir1][current[3]][current[4]][dir2]) {
+                visited[current[0]][current[1]][dir1][current[3]][current[4]][dir2] = true;
+                q.add(new int[] {current[0], current[1], dir1, current[3], current[4], dir2, current[6]+1});
+            }
+
+        }
+
+        return time;
+    }
+
+    private static boolean OOB(int nx, int ny) {
+        return nx < 0 || nx > N-1 || ny < 0 || ny > N-1;
+    }
+}
+```