import java.util.Scanner; public class TrianglePattern{ public static void main(String args[]){ Scanner input = new Scanner(System.in); System.out.println("Enter a row number : "); int row = input.nextInt(); int k = 1; for(int i = 1 ; i <= row ; i++){ k = 1; for(int j = 1 ; j <= 2*row-1 ; j++){ if(j>=(row+1-i)&&j<=(row+i-1)){ System.out.print(k); k=j>=row ? --k : ++k ; } else System.out.println(); } System.out.printf("\n"); } } }