[Week10] PGS 87694: 아이템 줍기

weekly/week10/PGS_87694_아이템줍기/Hexeong.java

@@ -0,0 +1,72 @@
+import java.util.*;
+
+public class Hexeong {
+    static int[][] map;
+    static int[] dx = {1, -1, 0, 0}; // 오, 왼, 위, 아래
+    static int[] dy = {0, 0, 1, -1};
+
+    public int solution(int[][] rectangle, int characterX, int characterY, int itemX, int itemY) {
+        // 1. 2배 확대된 맵 생성 (최대 50*2 = 100)
+        map = new int[101][101];
+
+        for (int[] rec : rectangle) {
+            int x1 = rec[0] * 2, y1 = rec[1] * 2, x2 = rec[2] * 2, y2 = rec[3] * 2;
+            for (int i = x1; i <= x2; i++) {
+                for (int j = y1; j <= y2; j++) {
+                    // 이미 내부(2)로 판정된 곳은 건드리지 않음
+                    if (map[i][j] == 2) continue;
+
+                    // 테두리인 경우 1, 내부인 경우 2
+                    if (i == x1 || i == x2 || j == y1 || j == y2) {
+                        map[i][j] = 1;
+                    } else {
+                        map[i][j] = 2;
+                    }
+                }
+            }
+        }
+
+        // 2. BFS 탐색
+        return bfs(characterX * 2, characterY * 2, itemX * 2, itemY * 2);
+    }
+
+    public int bfs(int startX, int startY, int targetX, int targetY) {
+        Deque<Position> queue = new ArrayDeque<>();
+        queue.add(new Position(startX, startY, 0));
+
+        boolean[][] visited = new boolean[101][101];
+        visited[startX][startY] = true;
+
+        while (!queue.isEmpty()) {
+            Position cur = queue.poll();
+
+            // 목표 도달 시 (2배 확대 상태이므로 거리를 2로 나눔)
+            if (cur.x == targetX && cur.y == targetY) {
+                return cur.dist / 2;
+            }
+
+            for (int i = 0; i < 4; i++) {
+                int nx = cur.x + dx[i];
+                int ny = cur.y + dy[i];
+
+                // 맵 범위 안이고, 테두리(1)이며, 방문하지 않은 곳 탐색
+                if (nx >= 0 && nx <= 100 && ny >= 0 && ny <= 100) {
+                    if (map[nx][ny] == 1 && !visited[nx][ny]) {
+                        visited[nx][ny] = true;
+                        queue.add(new Position(nx, ny, cur.dist + 1));
+                    }
+                }
+            }
+        }
+        return 0;
+    }
+
+    static class Position {
+        int x, y, dist;
+        Position(int x, int y, int dist) {
+            this.x = x;
+            this.y = y;
+            this.dist = dist;
+        }
+    }
+}