[20250825] BOJ / G3 / 보물 찾기 2 / 이강현

lkhyun/202508/25 BOJ G3 보물 찾기 2.md

@@ -0,0 +1,79 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static StringBuilder sb = new StringBuilder();
+    static int H,W;
+    static char[][] map;
+    static int starti,startj;
+    static int[] di = {-1,0,1,1,1,0,-1,-1};
+    static int[] dj = {1,1,1,0,-1,-1,-1,0};
+
+    public static void main(String[] args) throws Exception {
+        st = new StringTokenizer(br.readLine());
+        H = Integer.parseInt(st.nextToken());
+        W = Integer.parseInt(st.nextToken());
+
+        map = new char[H][W];
+
+        for (int i = 0; i < H; i++) {
+            char[] line = br.readLine().toCharArray();
+            for (int j = 0; j < W; j++) {
+                map[i][j] = line[j];
+                if(line[j] == 'K'){
+                    starti = i;
+                    startj = j;
+                }
+            }
+        }
+
+        bw.write(BFS()+"");
+        bw.close();
+    }
+    public static int BFS(){
+        ArrayDeque<int[]> q = new ArrayDeque<>();
+        int[][] dist = new int[H][W];
+        for (int i = 0; i < H; i++) {
+            Arrays.fill(dist[i], Integer.MAX_VALUE);
+        }
+        q.offer(new int[]{starti,startj,0});
+        dist[starti][startj] = 0;
+
+        while(!q.isEmpty()){
+            int[] cur = q.poll();
+            if(map[cur[0]][cur[1]] == '*') return dist[cur[0]][cur[1]];
+            if(dist[cur[0]][cur[1]] < cur[2]) continue;
+
+            for (int k = 0; k < 3; k++) {
+                int ni = cur[0] + di[k];
+                int nj = cur[1] + dj[k];
+                if(check(ni,nj)){
+                    if(dist[ni][nj] > cur[2]){
+                        q.addFirst(new int[]{ni,nj,cur[2]});
+                        dist[ni][nj] = cur[2];
+                    }
+                }
+            }
+            for (int k = 3; k < 8; k++) {
+                int ni = cur[0] + di[k];
+                int nj = cur[1] + dj[k];
+                if(check(ni,nj)){
+                    if(dist[ni][nj] > cur[2]+1){
+                        q.addLast(new int[]{ni,nj,cur[2]+1});
+                        dist[ni][nj] = cur[2]+1;
+                    }
+                }
+            }
+        }
+        return -1;
+    }
+    public static boolean check(int i, int j){
+        if(i < 0 || i >= H || j < 0 || j >= W || map[i][j] == '#') return false;
+        return true;
+    }
+}
+```