View Code of Problem 57

    import java.util.Scanner;
     
    public class Main 
    {
    	public static void main(String[] args) 
            {
              Scanner scan=new Scanner(System.in);
              int n=scan.nextInt();
              for(int i=1;i<=n;i++)
              {
                for(int j=1;j<=n-i;j++)
                {
                  System.out.print(" ");
                }
                for(int k=1;k<=i;k++)
                {
                  System.out.print(k);
                }
                for(int l=i-1;l>=1;l--)
                {
                  System.out.print(l);
                }
              }
              
              for(int i=n-1;i>=1;i--)
              {
                for(int j=1;j<=n-i;j++)
                {
                  System.out.print(" ");
                }
                for(int k=1;k<=i;k++)
                {
                  System.out.print(k);
                }
                for(int l=i-1;l>=1;l--)
                {
                  System.out.print(l);
                }
              }
             
             
            }
    }