Practice>Python>Regex and Parsing>Matrix Script

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Matrix Script

Problem Link : https://www.hackerrank.com/challenges/matrix-script/problem

Difficulty : Hard

 

Tip

• MUST remove __main__, it lead to fail even correct answer, because there is 'if'
• Should use regular expression Lookahead and lookbehind
• Write regular expression, to capture [alphabet][symboles][alphabet]

 

Solution

#!/bin/python3 import math import os import random import re import sys mn = input().split() m = int(mn[0]) n = int(mn[1]) matrix = [] for i in range(m): matrix.append(input()) r = '' for j in range(n): for i in range(m): r += matrix[i][j] r = re.sub(r'(?<=[a-zA-Z0-9]{1})([!@#$%& ]+)(?=[a-zA-Z0-9]{1})', ' ', r) print(r)