[Stage 15] Add Border

14 Mar 2018 • Algorithm

Given a rectangular matrix of characters, add a border of asterisks(*) to it.

Example

For

picture = ["abc",
           "ded"]

the output should be

addBorder(picture) = ["*****",
                      "*abc*",
                      "*ded*",
                      "*****"]

Input/Output

  • [execution time limit] 4 seconds (py3)

  • [input] array.string picture

A non-empty array of non-empty equal-length strings.

Guaranteed constraints:
1 ≤ picture.length ≤ 100,
1 ≤ picture[i].length ≤ 100.

[output] array.string

The same matrix of characters, framed with a border of asterisks of width 1.

def addBorder(picture):
    top_bottom_frame = ""
    framed_picture = list()

    for i in range(len(picture)):
        if i == 0:
            top_bottom_frame = '*' * (len(picture[0])+2)
            framed_picture.append(top_bottom_frame)

        framed_str = '*' + picture[i] + '*'
        framed_picture.append(framed_str)

        if i == len(picture)-1:
            top_bottom_frame = '*' * (len(picture[0])+2)
            framed_picture.append(top_bottom_frame)

    return framed_picture

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