[20250901] BOJ / G3 / 육각 보드/ 한종욱

Ukj0ng/202509/1 BOJ G3 육각 보드.md

@@ -0,0 +1,71 @@
+```
+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[] dx = {1, 1, 0, 0, -1, -1};
+    private static final int[] dy = {0, -1, 1, -1, 0, 1};
+    private static char[][] board;
+    private static int[][] arr;
+    private static int N, color;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        for (int i = 0; i < N; i++) {
+            for (int j = 0; j < N; j++) {
+                if (board[i][j] == 'X' && arr[i][j] == 0) {
+                    color = Math.max(color, 1);
+                    BFS(i, j);
+                }
+            }
+        }
+
+        bw.write(color + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        color = 0;
+        board = new char[N][N];
+        arr = new int[N][N];
+
+        for (int i = 0; i < N; i++) {
+            board[i] = br.readLine().toCharArray();
+        }
+    }
+
+    private static void BFS(int x, int y) {
+        Queue<int[]> q = new ArrayDeque<>();
+        arr[x][y] = 1;
+        q.add(new int[]{x, y});
+
+        while (!q.isEmpty()) {
+            int[] current = q.poll();
+
+            for (int i = 0; i < 6; i++) {
+                int nx =  current[0] + dx[i];
+                int ny = current[1] + dy[i];
+
+                if (OOB(nx, ny) || board[nx][ny] != 'X') continue;
+                if (arr[nx][ny] == 0) {
+                    color = Math.max(color, 2);
+                    arr[nx][ny] = 3 - arr[current[0]][current[1]];
+                    q.add(new int[]{nx, ny});
+                } else if (arr[nx][ny] == arr[current[0]][current[1]]) {
+                    color = Math.max(color, 3);
+                    return;
+                }
+            }
+        }
+    }
+
+    private static boolean OOB(int nx, int ny) {
+        return nx < 0 || nx > N-1 || ny < 0 || ny > N-1;
+    }
+}
+```