10996_별 찍기 - 21.java

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

public class Main{
    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());
        if(n==1){
            bw.write("*\n");
        } else{
            for(int i=0;i<2*n;i++){
                if(i%2==1){
                    for(int j=0;j<n;j++){
                        if(j%2==1){
                            bw.write("*");
                        } else{
                            bw.write(" ");
                        }
                    }
                } else {
                    for(int j=0;j<n;j++){
                        if(j%2==1){
                            bw.write(" ");
                        } else{
                            bw.write("*");
                        }
                    }
                }
                bw.write("\n");
            }
        }
        bw.flush();
        bw.close();
    }
}