[BOJ] 16956 늑대와 양 (JAVA)

https://www.acmicpc.net/problem/16956

16956번: 늑대와 양

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class Main {
	
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        StringTokenizer st = new StringTokenizer(br.readLine(), " ");
        int R = Integer.parseInt(st.nextToken());
        int C = Integer.parseInt(st.nextToken());
        char[][] map = new char[R][C];
        ArrayList<int[]> list = new ArrayList<>();
        for (int i = 0; i < R; i++) {
            String line = br.readLine();
            for (int j = 0; j < C; j++) {
                char c = line.charAt(j);
                map[i][j] = c;
                if (c == 'S') list.add(new int[] { i, j });
                if (c == '.') map[i][j] = 'D';
            }
        }

        int[] dr = { -1,  0,  1,  0 };
        int[] dc = {  0,  1,  0, -1 };
        for (int[] pos : list) {
            for (int dir = 0; dir < 4; dir++) {
                int nr = pos[0] + dr[dir];
                int nc = pos[1] + dc[dir];
                if (0 <= nr && nr < R && 0 <= nc && nc < C) {
                    if (map[nr][nc] == 'W') {
                        System.out.print(0);
                        return;
                    }
                }
            }
        }

        System.out.println(1);
        for (int i = 0; i < R; i++) {
            for (int j = 0; j < C; j++) {
                sb.append(map[i][j]);
            }
            sb.append("\n");
        }
        System.out.print(sb);

    }
	
}