Ruudukko

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

public class ruudut {


	public static void main(String[] args) throws IOException {

		// Scanner input = new Scanner(System.in);
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String[] parts = br.readLine().split(" ");
		
		int n = Integer.parseInt(parts[0]);  // ruudukon koko
		int m = Integer.parseInt(parts[1]); // operaatioiden maara
		

		int[] y1 = new int[m];  // alkuarvot
		int[] y2 = new int[m]; 
		int[] x1 = new int[m]; 
		int[] x2 = new int[m]; 
		
		char[][] taulu = new char[n][n];

		for (int i = 0; i < n; i++) {
		  for (int i2 = 0; i2 < n; i2++) {
			taulu[i][i2] = '.';
		  }
		}
		
		for (int i = 0; i < m; i++) {
			String[] parts2 = br.readLine().split(" ");
			y1[i] = Integer.parseInt(parts2[0]);
			x1[i] = Integer.parseInt(parts2[1]);
			y2[i] = Integer.parseInt(parts2[2]);
			x2[i] = Integer.parseInt(parts2[3]);
		}
		
		// input.close(); 
		

		
		StringBuilder sb = new StringBuilder();
		
		
		for (int i2 = 0; i2 < m; i2++) {
        for (int i = (y1[i2]-1); i < y2[i2]; i++) {
            for (int j = (x1[i2]-1); j < x2[i2]; j++) {
                taulu[i][j] = (taulu[i][j] == '.') ? '#' : '.';
                }
            }

		
		} // i2
		
		
		// tulostus
		
		// sb.append(x[t-1]).append('\n');
		
		
		// System.out.println(dy + " " + dx);	


        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
				
				sb.append(taulu[i][j]);
				
                }
				sb.append('\n');
            }



		System.out.print(sb.toString());
		
    }  // main
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 3

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 5

Group: 3

Verdict: TIME LIMIT EXCEEDED