import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner scn = new Scanner(System.in);
int n = scn.nextInt();
int nsp=4*n-2;
int row=1;int num=n;
int i;
while(row<=2*n+1)
{
for(i=n;i>=num;i--)
{
System.out.print(i+" ");
}
for(i=1;i<=nsp;i++)
{
System.out.print(" ");
}
for(i=num;i<=n;i++)
{
System.out.print(i+" ");
}
if(row<=n)
{
num-=1;nsp-=4;
}
else
{
num+=1;nsp+=4;
}
System.out.print("\n");
row+=1;
}
}
}
the above mentioned is my code