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intresting pattern.java
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import java.util.*;
import java.lang.*;
class Test{
public static void main(String e[]){
Scanner sc= new Scanner(System.in);
int n=sc.nextInt();
int i,j,k;
for(i=0;i<n;i++)
{
for(j=0;j<=i;j++){
System.out.print("*");
if(j!=i)
System.out.print(" ");
}
for(j=2*(n-i)-1;j>0;j--)
System.out.print(" ");
for(j=0;j<=i;j++)
System.out.print("* ");
System.out.println();
}
for(i=n-1;i>=0;i--){
for(j=i;j>=0;j--){
System.out.print("*");
if(j!=0)
System.out.print(" ");
}
for(j=0;j<2*(n-i)-1;j++)
System.out.print(" ");
for(j=i;j>=0;j--)
System.out.print("* ");
System.out.println();
}
System.out.println();
for(i=n-1;i>=0;i--){
for(j=i;j>=0;j--){
System.out.print("*");
if(j!=0)
System.out.print(" ");
}
for(j=0;j<2*(n-i)-1;j++)
System.out.print(" ");
for(j=i;j>=0;j--)
System.out.print("* ");
System.out.println();
}
for(i=0;i<n;i++)
{
for(j=0;j<=i;j++){
System.out.print("*");
if(j!=i)
System.out.print(" ");
}
for(j=2*(n-i)-1;j>0;j--)
System.out.print(" ");
for(j=0;j<=i;j++)
System.out.print("* ");
System.out.println();
}
System.out.println();
for(i=n-1;i>=0;i--){
for(j=i;j>=0;j--){
System.out.print(" ");
if(j!=0)
System.out.print(" ");
}
for(j=0;j<2*(n-i)-1;j++)
System.out.print("* ");
for(j=i;j>=0;j--)
System.out.print(" ");
System.out.println();
}
for(i=1;i<n;i++)
{
for(j=0;j<=i;j++){
System.out.print(" ");
if(j!=i)
System.out.print(" ");
}
for(j=2*(n-i)-1;j>0;j--)
System.out.print("* ");
for(j=0;j<=i;j++)
System.out.print(" ");
System.out.println();
}
}
}