Pyramid pattern algorithm developing

Question

I was doing some hackerrank practice and I couldnt solve it. I am newbie any ideas to solve this problem?

Please write a software program that prints the following pyramid pattern to the screen. Your program should get a number “n” as an input and should print n lines of the pyramid. (For example if your input is 4, then the following output is expected.)

(You can choose any programming language that you want.)

      1
    2 3 2
  3 4 5 4 3
4 5 6 7 6 5 4


#include<stdio.h>

int main()
{
    int i,j,k,l=1;
    for(i=1; i<=5; i++)
    {
        for(j=4; j>=i; j--)
        {
            printf(" ");
        }
        
        for(k=1; k<=l; k++)
        { 
            printf("%d",k);
        }            
            l = l+2;    
        printf("\n");
    }
    return 0;
}

please share what you tried and we would help you rectify it — Krishna Chaurasia
– Krishna Chaurasia, Commented Feb 11, 2021 at 7:19
@Krishna Chaurasia I added what I have done so far. Could you help me to fix that the expected output above ? — vitaminJava
– vitaminJava, Commented Feb 11, 2021 at 7:27
The code is in C language but you have added the python tag. Editing the tag to add C will likely get you more help. — Krishna Chaurasia
– Krishna Chaurasia, Commented Feb 11, 2021 at 7:28
@Krishna Chaurasia it could be done any language. I open every of them. Could u help — vitaminJava
– vitaminJava, Commented Feb 11, 2021 at 7:30
@burakzbc Hint: have a separate loop for the left and right triangle. Also use some maths to calculate the number that needs to be printed. — Abdul Aziz Barkat
– Abdul Aziz Barkat, Commented Feb 11, 2021 at 7:37

Deepak Tatyaji Ahire · Accepted Answer · 2021-02-11 08:33:11Z

These types of problems can be solved by simple mathematics.

I would advice you to solve this by problem by breaking it into simpler and smaller use cases as follows:

Number of blank spaces on each line.
Number of Elements (on each line) until the centre of pyramid.

Number of Elements (on each line) after the centre of pyramid.

 #include<stdio.h>

 int main()
 {
     int N;
     scanf("%d", &N);

     int numberOfBlankSpaces = N + 2;

     for(int i=1; i<=N ;i++){    

         for(int j=0;j<numberOfBlankSpaces;j++){
             printf(" ");
         }

         numberOfBlankSpaces -= 2;

         int number_of_elements_until_centre_on_each_line = i;
         int startingElement = i;

         //Print increasing order until center
         while(number_of_elements_until_centre_on_each_line--){
             printf("%d ", startingElement);
             startingElement++;
         }

         // Starting element = Element at center - 1 
         startingElement-=2;

         //Print decresing order
         while(startingElement >= i){
             printf("%d ", startingElement);
             startingElement--;
         }

         printf("\n");
     }

     return 0;
 }

Input: 4

Output:

      1 
    2 3 2 
  3 4 5 4 3 
4 5 6 7 6 5 4

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