[20251201] BOJ / G5 / 장군 / 한종욱

Ukj0ng/202512/01 BOJ G5 장군.md

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+```
+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[] dr = {-3, -3, 3, 3, -2, 2, -2, 2};
+    private static final int[] dc = {-2, 2, -2, 2, -3, -3, 3, 3};
+    private static final int[] check1r = {-1, -1, 1, 1, 0, 0, 0, 0};
+    private static final int[] check1c = {0, 0, 0, 0, -1, -1, 1, 1};
+    private static final int[] check2r = {-2, -2, 2, 2, -1, 1, -1, 1};
+    private static final int[] check2c = {-1, 1, -1, 1, -2, -2, 2, 2};
+    private static int R = 10;
+    private static int C = 9;
+    private static int r1, c1, r2, c2;
+    private static int[][] dist;
+
+    public static void main(String[] args) throws IOException {
+        init();
+
+        int result = bfs();
+        bw.write(result + "\n");
+
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        r1 = Integer.parseInt(st.nextToken());
+        c1 = Integer.parseInt(st.nextToken());
+
+        st = new StringTokenizer(br.readLine());
+        r2 = Integer.parseInt(st.nextToken());
+        c2 = Integer.parseInt(st.nextToken());
+
+        dist = new int[R][C];
+        for (int i = 0; i < R; i++) {
+            Arrays.fill(dist[i], -1);
+        }
+    }
+
+    private static int bfs() {
+        Queue<Node> q = new LinkedList<>();
+        q.offer(new Node(r1, c1));
+        dist[r1][c1] = 0;
+
+        while (!q.isEmpty()) {
+            Node cur = q.poll();
+
+            if (cur.r == r2 && cur.c == c2) {
+                return dist[cur.r][cur.c];
+            }
+
+            for (int i = 0; i < 8; i++) {
+                int nr = cur.r + dr[i];
+                int nc = cur.c + dc[i];
+
+                if (OOB(nr, nc) || dist[nr][nc] != -1) continue;
+
+                int t1r = cur.r + check1r[i];
+                int t1c = cur.c + check1c[i];
+                if (t1r == r2 && t1c == c2) continue;
+
+                int t2r = cur.r + check2r[i];
+                int t2c = cur.c + check2c[i];
+                if (t2r == r2 && t2c == c2) continue;
+
+                dist[nr][nc] = dist[cur.r][cur.c] + 1;
+                q.offer(new Node(nr, nc));
+            }
+        }
+        return -1;
+    }
+
+    private static boolean OOB(int nr, int nc) {
+        return nr < 0 || nc < 0 || nr > R-1 || nc > C-1;
+    }
+
+    static class Node {
+        int r, c;
+        public Node(int r, int c) {
+            this.r = r;
+            this.c = c;
+        }
+    }
+}
+```