백준 2447번

원본 : www.acmicpc.net/problem/2447

2447번: 별 찍기 - 10

 

풀이

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {

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

		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int n  = Integer.parseInt(reader.readLine());
		int arr[][] = new int[n][n];
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr[i].length; j++) {
				arr[i][j] = 1;
			}
		}
		
		star(arr, n, 0, 0);
		
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr[i].length; j++) {
				if (arr[i][j] == 1) {
					writer.write("*");
				} else {
					writer.write(" ");
				}
			}
			writer.newLine();
		}
		
		writer.flush();
	}
	
	public static void star(int[][] arr, int n, int indexBeginX, int indexBeginY) {
		if (n != 1) {
			for (int i = n / 3; i <  2 * n / 3; i++) {
				for (int j = n / 3; j < 2 * n / 3; j++) {
					arr[indexBeginX + i][indexBeginY + j] = 0;
				}
			}
			
			for (int i = 0; i < n; i += n / 3) {
				for (int j = 0; j < n; j += n / 3) {
					star(arr, n / 3, indexBeginX + i, indexBeginY + j);
				}
			}
		}
	}
	
}