Fraktaali

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Scanner;

public class Fraktaali {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        List<List<String>> frakt = new ArrayList<List<String>>();
        frakt.add(new ArrayList<String>());
        frakt.get(0).add("#");
        int size = frakt.size();
        for (int i = 1; i < n; i++) {
            for (int j = 0; j < size; j++) {
                frakt.add(new ArrayList<>());
            }
            for (int j = 0; j < size * 2; j++) {
                int lim;
                if (j >= size) {
                    lim = size * 2;
                }
                else {
                    lim = size;
                }
                for (int k = 0; k < lim; k++) {
                    String chara;
                    if (!(j >= size & k >= size)) {
                        chara = frakt.get(j % size).get(k % size);
                    }
                    else {
                        if ( Objects.equals(frakt.get(j % size).get(k % size), "#")) {
                            chara = ".";
                        }
                        else {
                            chara = "#";
                        }
                    }
                    frakt.get(j).add(chara);
                }
            }
            size = frakt.size();
        }
        for (int y = 0; y < size; y++) {
            String line = "";
            for (int x = 0; x < size; x++) {
                line = line + frakt.get(y).get(x);
            }
            System.out.println(line);
        }
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED

Test 4

Group: 4

Verdict: ACCEPTED

Test 5

Group: 5

Verdict: ACCEPTED

Test 6

Group: 6

Verdict: ACCEPTED

Test 7

Group: 7

Verdict: ACCEPTED

Test 8

Group: 8

Verdict: ACCEPTED

Test 9

Group: 9

Verdict: ACCEPTED

Test 10

Group: 10

Verdict: ACCEPTED