Algorithm


Problem Name: Python - Alphabet Rangoli

Problem Link: https://www.hackerrank.com/challenges/alphabet-rangoli/problem?isFullScreen=true

In this HackerRank Functions in PYTHON problem solution,

You are given an integer, N. Your task is to print an alphabet rangoli of size N.(Rangoli is a form of Indian folk art based on creation of patterns.)

Different sizes of alphabet rangoli are shown below:

 

#size 3

----c----
--c-b-c--
c-b-a-b-c
--c-b-c--
----c----

#size 5

--------e--------
------e-d-e------
----e-d-c-d-e----
--e-d-c-b-c-d-e--
e-d-c-b-a-b-c-d-e
--e-d-c-b-c-d-e--
----e-d-c-d-e----
------e-d-e------
--------e--------

#size 10

------------------j------------------
----------------j-i-j----------------
--------------j-i-h-i-j--------------
------------j-i-h-g-h-i-j------------
----------j-i-h-g-f-g-h-i-j----------
--------j-i-h-g-f-e-f-g-h-i-j--------
------j-i-h-g-f-e-d-e-f-g-h-i-j------
----j-i-h-g-f-e-d-c-d-e-f-g-h-i-j----
--j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j--
j-i-h-g-f-e-d-c-b-a-b-c-d-e-f-g-h-i-j
--j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j--
----j-i-h-g-f-e-d-c-d-e-f-g-h-i-j----
------j-i-h-g-f-e-d-e-f-g-h-i-j------
--------j-i-h-g-f-e-f-g-h-i-j--------
----------j-i-h-g-f-g-h-i-j----------
------------j-i-h-g-h-i-j------------
--------------j-i-h-i-j--------------
----------------j-i-j----------------
------------------j------------------

The center of the rangoli has the first alphabet letter a, and the boundary has the N**th alphabet letter (in alphabetical order).

Function Description

 

Complete the rangoli function in the editor below.

 

rangoli has the following parameters:

 

  • int size: the size of the rangoli

 

Returns

 

  • string: a single string made up of each of the lines of the rangoli separated by a newline character (\n)

Input Format

Only one line of input containing size, the size of the rangoli.

Constraints

0 < size <27

Sample Input

5

Sample Output

--------e--------
------e-d-e------
----e-d-c-d-e----
--e-d-c-b-c-d-e--
e-d-c-b-a-b-c-d-e
--e-d-c-b-c-d-e--
----e-d-c-d-e----
------e-d-e------
--------e--------

 

 

 

Code Examples

#1 Code Example with Python Programming

Code - Python Programming


def print_rangoli(size):
    # your code goes here
    centers = list(range(size - 1, 0, -1)) + list(range(0, size))
    for c in centers:
        digits = list(range(size - 1, c, -1)) + list(range(c, size))
        print('-'.join([chr(d + ord('a')) for d in digits]).center(4 * size - 3, '-'))
Copy The Code & Try With Live Editor
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Demonstration


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