장애물 인식 프로그램(java)

https://softeer.ai/practice/info.do?idx=1&eid=409 

Softeer

import java.util.*;
import java.io.*;


public class Main
{
    public static int checkValue = 999;
   
    public static void main(String args[]) throws IOException
    {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(in.readLine());

        int[][] pan = new int[n][n];

        for(int i = 0; i < n; i++){
            String value = in.readLine();
            for (int j = 0; j < n; j++){
                pan[i][j] = value.charAt(j) - '0';
            }
        }

        ArrayList<Integer> resultList = new ArrayList<Integer>();
        for(int i = 0; i < n; i++){
            for (int j = 0; j < n; j++){
                if (pan[i][j] == 1){
                    resultList.add(getArea(pan, i, j, n));
                }
            }
        }
        Collections.sort(resultList);
        System.out.println(resultList.size());

        for(int result: resultList){
            System.out.println(result);
        }
    }

    public static int getArea(int[][] pan, int x, int y, int n){
        pan[x][y] = checkValue;
        int result = 1;
        int[] moveX = {-1, 0, 1, 0};
        int[] moveY = {0, 1, 0, -1};

        for (int i = 0; i<4; i++){
            int nextX = x + moveX[i];
            int nextY = y + moveY[i];

            if(nextX < 0 || nextY < 0 || nextX >= n || nextY >= n){
                continue;
            }

            if (pan[nextX][nextY] == 1){
                result += getArea(pan, nextX, nextY, n);
            }
        }
        return result;
    }
    
}