[입출력] 백준 2445

 

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int len = n*2;
		StringBuilder sb = new StringBuilder();
		
		// 위
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= len; j++) {
				if(j <= i) {
					sb.append("*");
				} else if (j > len - i) {
					sb.append("*");
				}
				else {
					sb.append(" ");
				}
			}
			sb.append("\n");			
		}
		
		// 아래
		for (int i = n - 1; i > 0; i--) {
			for (int j = 1; j <= len; j++) {
				if(j <= i) {
					sb.append("*");
				} else if (j > len - i) {
					sb.append("*");
				}
				else {
					sb.append(" ");
				}
			}
			sb.append("\n");			
		}		
		System.out.print(sb.toString());
	}
}