[20250911] BOJ / G5 / 게임 / 이인희

LiiNi-coder/202509/11 BOJ 게임.md

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+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.PriorityQueue;
+import java.util.StringTokenizer;
+
+import org.w3c.dom.Node;
+
+public class Main {
+    static final int MAX = 500;
+    static final int INF = Integer.MAX_VALUE;
+    static int[][] map = new int[MAX + 1][MAX + 1]; // 0: safe, 1: danger, 2: death
+    static int[][] dist = new int[MAX + 1][MAX + 1];
+    static int[] dr = {1, -1, 0, 0};
+    static int[] dc = {0, 0, 1, -1};
+
+    static class Node {
+        int r, c, cost;
+        Node(int r, int c, int cost) {
+            this.r = r;
+            this.c = c;
+            this.cost = cost;
+        }
+    }
+    public static void main(String[] args) throws IOException {
+        var br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        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());
+            markArea(x1, y1, x2, y2, 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());
+            markArea(x1, y1, x2, y2, 2);
+        }
+
+        for (int[] row : dist)
+            Arrays.fill(row, INF);
+        dist[0][0] = 0;
+        PriorityQueue<Node> pq = new PriorityQueue<>((a, b) -> a.cost - b.cost);
+        pq.add(new Node(0, 0, 0));
+        while (!pq.isEmpty()) {
+            Node cur = pq.poll();
+            if (cur.cost > dist[cur.r][cur.c])
+                continue;
+            if (cur.r == MAX && cur.c == MAX)
+                break;
+            for (int d = 0; d < 4; d++) {
+                int nr = cur.r + dr[d];
+                int nc = cur.c + dc[d];
+                if (nr < 0 || nr > MAX || nc < 0 || nc > MAX)
+                    continue;
+                if (map[nr][nc] == 2)
+                    continue;
+                int ncst = cur.cost + (map[nr][nc] == 1 ? 1 : 0);
+                if (ncst < dist[nr][nc]) {
+                    dist[nr][nc] = ncst;
+                    pq.add(new Node(nr, nc, ncst));
+                }
+            }
+        }
+        int answer = dist[MAX][MAX];
+        System.out.println(answer == INF ? -1 : answer);
+    }
+
+    static void markArea(int x1, int y1, int x2, int y2, int val) {
+        int sx = Math.min(x1, x2);
+        int ex = Math.max(x1, x2);
+        int sy = Math.min(y1, y2);
+        int ey = Math.max(y1, y2);
+        for (int i = sx; i <= ex; i++) {
+            for (int j = sy; j <= ey; j++) {
+                map[i][j] = val;
+            }
+        }
+    }
+
+}
+
+```