Merge pull request #578 from AlgorithmWithGod/suyeun84

[20250730] BOJ / G5 / 농장 관리 / 김수연

Author: ShinHeeEul

suyeun84/202507/30 BOJ G5 농장 관리.md

@@ -0,0 +1,67 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class boj1245 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+    static int nextInt() {return Integer.parseInt(st.nextToken());}
+
+    static int N, M, answer;
+    static int[][] map;
+    static boolean[][] visited, top;
+    static int[][] dir = {{1,0}, {0,1}, {0,-1}, {-1,0}, {-1,1}, {-1,-1}, {1,1}, {1,-1}};
+    public static void main(String[] args) throws Exception {
+        nextLine();
+        N = nextInt();
+        M = nextInt();
+        map = new int[N][M];
+        top = new boolean[N][M];
+        for (int i = 0; i < N; i++) {
+            nextLine();
+            for (int j = 0; j < M; j++) map[i][j] = nextInt();
+        }
+        for (int i = 0; i < N; i++) {
+            for (int j = 0; j < M; j++) {
+                if (map[i][j] == 0 || top[i][j]) continue;
+                bfs(i, j);
+            }
+        }
+        System.out.println(answer);
+    }
+    static void bfs(int y, int x) {
+        Queue<Pos> q = new LinkedList<>();
+        boolean[][] visited = new boolean[N][M];
+        LinkedList<Pos> topList = new LinkedList<>();
+        q.add(new Pos(y, x));
+        visited[y][x] = true;
+        while (!q.isEmpty()) {
+            Pos cur = q.poll();
+            for (int[] d : dir) {
+                int ny = cur.y + d[0];
+                int nx = cur.x + d[1];
+                if (ny < 0 || ny >= N || nx < 0 || nx >= M || visited[ny][nx]) continue;
+                visited[ny][nx] = true;
+                if (map[ny][nx] > map[cur.y][cur.x]) return;
+                else if (map[ny][nx] == map[cur.y][cur.x]) {
+                    q.add(new Pos(ny, nx));
+                    topList.add(new Pos(ny, nx));
+                }
+            }
+        }
+        for (Pos pos : topList) {
+            top[pos.y][pos.x] = true;
+        }
+        answer++;
+    }
+
+    static class Pos {
+        int y, x;
+        public Pos(int y, int x) {
+            this.y = y;
+            this.x = x;
+        }
+    }
+}
+```