백준(java) 별찍기 9 -2446

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int N = Integer.parseInt(br.readLine());
		for(int i=0;i<N;i++) {
			for(int j=0;j<i;j++) {
				System.out.print(" ");
			}
			for(int j=0;j<(2*N-1)-(2*i);j++) {
				System.out.print("*");
			}
			System.out.println();
		}
		for(int i=0;i<N-1;i++) {
			for(int j=1;j<N-1-i;j++) {
				System.out.print(" ");
			}
			for(int j=0;j<3+2*i;j++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
}