View Code of Problem 53

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= 2*i-1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
        for (int i = n-1; i > 0; i--) {
            for (int j = 1; j <= n-i; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k < 2*i-1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}