[Algorithm] addBoarder

Problem

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

• [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.

Solution

def addBoarder(picture):
lst = []

lst.append("*" * len(picture[0] + 2))
for i in picture:
i = "*" + i + "*"
lst.append(i)
lst.append("*" * len(picture[0] + 2))

return lst

*lst : 애스터리스크(*)를 포함하여 저장할 리스트 변수입니다.