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java
12 days ago
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class Main {
    public static void printPattern(int n){
        int total_number_of_line = n;

        int spaces = n-1;
        int stars = 1;

        int current_number_of_line = 1;

        while(current_number_of_line <= total_number_of_line){
            // print spaces
            for(int i=1; i<=spaces; i++){
                System.out.print("  ");
            }

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


            // prepare for next line 
            System.out.println();
            current_number_of_line++;
            spaces--;
            stars++;
        }
    }

    public static void butterFlyPattern(int n){
        int total_number_of_line = 2*n-1;

        int stars = 1;
        int spaces = 2*n-2;

        int current_number_of_line = 1;
        
        while(current_number_of_line <= total_number_of_line){
            // print stars  
            for(int i=1; i<=stars; i++){
                System.out.print("* ");
            }

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

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

            // prepare for next line
            System.out.println();
            if(current_number_of_line < n){
                stars++;
                spaces = spaces - 2;
            } else {
                stars--;
                spaces = spaces + 2;
            }
            current_number_of_line++;
        }
    }

    public static void numberPyramid(int n){
        int total_number_of_line = n;
        int stars = 1;
        int spaces = n-1;

        int current_number_of_line = 1;

        while(current_number_of_line <= total_number_of_line){
            // print spaces 
            for(int i=1; i<=spaces; i++){
                System.out.print(" ");
            }
            // print stars
            for(int i=1; i<=stars; i++){
                System.out.print(i+" ");
            }

            // prepare for next line 
            System.out.println();
            current_number_of_line++;
            stars++;
            spaces--;
        }
    }

    public static void pallidromePyramid(int n){
        int total_number_of_line = 2*n-1;

        int stars = 1;
        int spaces = n-1;
        int current_number_of_line = 1;

        while(current_number_of_line <= total_number_of_line){
            // print spaces
            for(int i=1; i<=spaces; i++){
                System.out.print("  ");
            }

            // print stars
            int number_to_print = 1;
            for(int i=1; i<=stars; i++){
                System.out.print(number_to_print + " ");
                if(i <= stars/2){
                    number_to_print++;
                } else {
                    number_to_print--;
                }
            }

            // prepare for next line 
            System.out.println();
            if(current_number_of_line < n){
                spaces--;
                stars = stars+2;
            } else {
                spaces++;
                stars = stars-2;
            }
            current_number_of_line++;
        }
    }

    public static void main(String[] args) {
        int n = 5;
        pallidromePyramid(n);
    }
}
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