백준 1992 쿼드트리 (Java)

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static int N;
    public static char[][] maps;

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        N = Integer.parseInt(br.readLine());
        maps = new char[N][N];

        for (int i = 0; i < N; i++) {
                maps[i] = br.readLine().toCharArray();
        }
        papers(0,0,N);
    }

    public static void papers(int r, int c, int tmp) {
        if(tmp<=0)
            return;
        char color = maps[r][c];
        boolean div = false;
        loop:for (int i = r; i < r+tmp; i ++) {
            for (int j = c; j < c+tmp; j ++) {
                if (maps[i][j] != color) {
                    div = true;
                    System.out.print("(");
                    papers(r, c, tmp / 2);
                    papers(r, c+tmp/2, tmp / 2);
                    papers(r+tmp/2, c, tmp / 2);
                    papers(r+tmp/2, c+tmp/2, tmp / 2);
                    System.out.print(")");
                    break loop;
                }
            }
        }
        
        if(!div)
            System.out.print(color);
    }

}