Untitled

import java.util.*;
public class advancepattern {
    public static void pattern_hollowrec(int row , int column){
        //loop for rows 
        for(int i = 1; i<=row; i++){
            //loop for column
            for(int j = 1; j<=column; j++ ){
                if(i==1 || i==row || j==1 || j==column){
                    System.out.print("* ");
                }else{
                    System.out.print("  ");
                }
            }
            System.out.println();
        }
    }

    public static void pattern_iverted_and_rotated_half_pyramid(int n){
        //loop for row
        for(int i = 1; i<=n; i++){
            //for space
            for(int j = 1; j<=n-i; j++){
                System.out.print("  ");
            }
            // for starts
            for(int j = 1; j<=i; j++){
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    public static void pattern_iverted_and_rotated_half_pyramid_with_number(int n){
        for(int i = 0; i<=n-1; i++){
            for(int j = 1; j<=n-i; j++){
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
    public static void pattern_Floyd_triangle(int n){
        int c = 1;
        for(int i = 1 ; i<=n; i++){
            for(int j = 1; j<=i; j++){
                System.out.print(c + " ");
                c++;
            }
            System.out.println();
        }
    }

    public static void pattern_01_triangle(int n) {
         for(int i = 1 ; i<=n; i++){
            for(int j = 1 ; j<=i; j++){
                // int c = i+j;
                if((i+j)%2==0){
                    System.out.print("1 ");
                }
                else{
                    System.out.print("0 ");
                }
            }
            System.out.println();
         }
    }

        
    public static void butterfly(int n){
        for(int i = 1 ; i<=n; i++){
            for(int j = 1 ; j<=i; j++){
                System.out.print("* ");
            }
            for(int j = 1 ; j<=2*(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1 ; j<=i; j++){
                System.out.print("* ");
            }
            System.out.println();
        }
        for(int i = n ; i>=1; i--){
            for(int j = 1 ; j<=i; j++){
                System.out.print("* ");
            }
            for(int j = 1 ; j<=2*(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1 ; j<=i; j++){
                System.out.print("* ");
            }
            System.out.println();
        }
    }   
    
    public static void rhombus(int n){
        for(int i = 1 ; i<=n; i++){
            for(int j = 1 ; j<=(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1 ; j<=n; j++){
                System.out.print("* ");
            }
            System.out.println();
        }
    }

    public static void emptyrhombus(int n){
        for(int i = 1 ; i<=n; i++){
            for(int j = 1 ; j<=(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1; j<=n; j++ ){
                if(i==1 || i==n || j==1 || j==n){
                    System.out.print("* ");
                }else{
                    System.out.print("  ");
                }
            }
            System.out.println();
        }
    }

    public static void Diamond(int n){
        for(int i = 1 ; i<=n; i++){
            for(int j = 1 ; j<=(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1; j<=((2*i)-1); j++ ){
                System.out.print(j + " ");
            }
            System.out.println();
        }
        for(int i = n ; i>=1; i--){
            for(int j = 1 ; j<=(n-i); j++){
                System.out.print("  ");
            }
            for(int j = 1; j<=((2*i)-1); j++){
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }

    public static void Diamond2(int n){
        int totalnoline = (2*n)-1;
        int space = n-1;
        int star = 1;
        int currentline = 1;

        while(currentline <= totalnoline ){
            for(int i = 1 ; i<=space; i++){
                System.out.print("  ");
            }
            int number= 1;
            for(int i = 1; i<=star ; i++){
                System.out.print(number + " ");
                if(i<=star/2){
                    number++;
                }else{
                    number--;
                }
            }
            // for(int i = star; i>=1; i--){
            //     System.out.println(i + " ");
            // }
            System.out.println();
            if(currentline < n){
                space--;
                star=star+2;
            }else{
                space++;
                star=star-2;
            }
            currentline++;
        }
        // if(star==(2*n)+1){
        //     star = (2*n)-1;
        //     space++;
        // }
        // while(currentline >= 1 ){
        //     for(int i = 1 ; i<=space; i++){
        //         System.out.print("  ");
        //     }
        //     for(int i = 1; i<=star ; i++){
        //         System.out.print("* ");
        //     }
        //     System.out.println();
        //     currentline--;
        //     space++;
        //     star=star-2;
        // }
    }

    public static void butterfly2(int n){
        int totalnoline = 2*n;
        int space = (2*n)-2;
        int star = 1;
        int currentline = 1;

        while(currentline <= totalnoline ){
            //print star
            for(int i = 1; i<=star; i++){
                System.out.print("* ");
            }


            //print space
            for(int i = 1 ; i<=space; i++){
                System.out.print("  ");
            }

            //print star
            for(int i = 1; i<=star ; i++){
                System.out.print("* ");
            }

            //next line
            System.out.println();
            if(currentline < n){
                space=space-2;
                star++;
            } else{
                space=space+2;
                star--;
            }

            
            currentline++;
        }
        // if(star==(n+1)){
        //     star = n;
        //     space= space+2;
        // }
        // while(currentline >= 1 ){
        //     for(int i = 1; i<=star; i++){
        //         System.out.print("* ");
        //     }
        //     for(int i = 1 ; i<=space; i++){
        //         System.out.print("  ");
        //     }
        //     for(int i = 1; i<=star ; i++){
        //         System.out.print("* ");
        //     }
        //     System.out.println();
        //     currentline--;
        //     space=space+2;
        //     star--;
        // }
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("enter no. of rows");
        int i = sc.nextInt();
        // System.out.println("enter no. of column");
        // int j = sc.nextInt();
        // pattern_hollowrec(i, j);   
        // pattern_iverted_and_rotated_half_pyramid(i);
        // pattern_iverted_and_rotated_half_pyramid_with_number(i);
        // pattern_Floyd_triangle(i);
        // pattern_01_triangle(i);
        // rhombus(i);
        // emptyrhombus(i);
        // Diamond(i);
        Diamond2(i);
        // butterfly(i);
        // butterfly2(i);
        sc.close();
    }
}