This is the code
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
if(n<=1000){
int nst=1,nsp=1;
for(int row=1;row<=n/2;row++)
{
int cst=1;
while(cst<=nst)
{
System.out.print(“1”);
cst=cst+1;
}
System.out.println();
nst=nst+1;
}
for(int row=(n/2+1); row<=n; row++)
{
System.out.print(row-1);
int csp=1;
while(csp<=nsp)
{
System.out.print(“0”);
csp=csp+1;
}
nsp=nsp+1;
System.out.print(row-1);
System.out.println();
}
}