[20251107] BOJ / P5 / 바리스타의 힘 / 한종욱

Ukj0ng/202511/07 BOJ P5 바리스타의 힘.md

@@ -0,0 +1,110 @@
+```
+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 INF = (int) 1e9;
+    private static final int[] dx = {1, 0, -1, 0};
+    private static final int[] dy = {0, 1, 0, -1};
+    private static int[][][] dist;
+    private static int[][] map;
+    private static int N, M;
+    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 {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        dist = new int[N+1][M+1][2];
+        map = new int[N+1][M+1];
+
+        for (int i = 1; i <= N; i++) {
+            char[] input = br.readLine().toCharArray();
+            for (int j = 1; j <= M; j++) {
+                map[i][j] = input[j-1] - '0';
+                Arrays.fill(dist[i][j], INF);
+            }
+        }
+    }
+
+    private static int BFS() {
+        PriorityQueue<int[]> pq = new PriorityQueue<>((o1, o2) -> Integer.compare(o1[2], o2[2]));
+        int result = -1;
+        dist[1][1][0] = 0;
+        // x, y, dist, skill
+        pq.add(new int[]{1, 1, 0, 0});
+
+        while (!pq.isEmpty()) {
+            int[] current = pq.poll();
+
+            if (dist[current[0]][current[1]][current[3]] < current[2]) continue;
+
+            if (current[0] == N && current[1] == M) {
+                result = current[2];
+                break;
+            }
+
+            for (int i = 0; i < 4; i++) {
+                int nx = current[0] + dx[i];
+                int ny = current[1] + dy[i];
+
+                if (OOB(nx, ny) || map[nx][ny] == 1 || dist[nx][ny][current[3]] <= current[2]+1) continue;
+                dist[nx][ny][current[3]] = current[2]+1;
+                pq.add(new int[]{nx, ny, current[2]+1, current[3]});
+            }
+
+            if (current[3] == 0) {
+                for (int i = 0; i < 4; i++) {
+                    switch (i) {
+                        case 0:
+                            for (int j = current[0]; j <= N; j++) {
+                                if (dist[j][current[1]][1] <= current[2]+(j-current[0])) continue;
+                                dist[j][current[1]][1] = current[2]+(j-current[0]);
+                                pq.add(new int[]{j, current[1], current[2]+(j-current[0]), 1});
+                            }
+                            break;
+                        case 1:
+                            for (int j = current[1]; j <= M; j++) {
+                                if (dist[current[0]][j][1] <= current[2]+(j-current[1])) continue;
+                                dist[current[0]][j][1] = current[2]+(j-current[1]);
+                                pq.add(new int[]{current[0], j, current[2]+(j-current[1]), 1});
+                            }
+                            break;
+                        case 2:
+                            for (int j = current[0]; j >= 1; j--) {
+                                if (dist[j][current[1]][1] <= current[2]+(current[0]-j)) continue;
+                                dist[j][current[1]][1] = current[2]+(current[0]-j);
+                                pq.add(new int[]{j, current[1], current[2]+(current[0]-j), 1});
+                            }
+                            break;
+                        default:
+                            for (int j = current[1]; j >= 1; j--) {
+                                if (dist[current[0]][j][1] <= current[2]+(current[1]-j)) continue;
+                                dist[current[0]][j][1] = current[2]+(current[1]-j);
+                                pq.add(new int[]{current[0], j, current[2]+(current[1]-j), 1});
+                            }
+                    }
+                }
+            }
+        }
+
+        return result;
+    }
+
+    private static boolean OOB(int nx, int ny) {
+        return nx < 1 || nx > N || ny < 1 || ny > M;
+    }
+}
+```