[Algorithm/Baekjoon] 별 찍기 - 10 - 2447 (G5/JAVA)

📑문제링크

https://www.acmicpc.net/problem/2447

💻코드

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

public class Main {
    static String[][] arr = null;

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        int N = Integer.parseInt(br.readLine());
        arr = new String[N][N];

        printStar(0, 0, N);

        for (int i = 0; i < N; i++) {
            for (int j = 0; j < N; j++) {
                bw.write(arr[i][j] != null ? arr[i][j] : " ");
            }
            bw.write("\n");
        }
        bw.flush();

    }

    private static void printStar(int x, int y, int n) {
        if (n == 1) {
            arr[x][y] = "*";
            return;
        }

        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                if (!(i == 1 && j == 1)) {
                    printStar(x + i * n / 3, y + j * n / 3, n / 3);
                }
            }
        }
    }
}