2446_별 찍기 - 9.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());
        for(int i=0;i<n;i++){
            for(int j=0;j<i;j++){
                bw.write(" ");
            }
            for(int j=0;j<(2*n-1)-2*i;j++){
                bw.write("*");
            }
            bw.write("\n");
        }
        for(int i=n-2;i>=0;i--){
            for(int j=0;j<i;j++){
                bw.write(" ");
            }
            for(int j=0;j<(2*n-1)-2*i;j++){
                bw.write("*");
            }
            bw.write("\n");
        }
        bw.flush();
        bw.close();
    }
}