Decoding a run length encoded text

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I'm trying to decode a run length encoded text, from string 'A4B3C2' to 'AAAABBBCC', my code now however works by decoding the number first then the letter, which gives me an output of ABBBBCCC instead of what I want 'AAAABBBCC'

What I have tried:

class Solution:
    def decode(self,s):
        res, n = "", ""
        for char in s:
            if char.isdigit():
                n += char
            elif n == "":
                res += char
            else:
                res += char * int(n)
                n = ""
        return res

ob = Solution() 
print(ob.decode("A4B3C2"))

Posted 9-Nov-22 12:16pm

Awanis Reze

Updated 9-Nov-22 18:16pm

v2

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OriginalGriff · Answer 1 · 2022-11-09T18:16:00

What you need to do is:

1) Preset two variables to an empty string: last and result
2) Loop through each character in the input string
2.1) If the character is a digit, then add last that many times to result
2.2) Otherwise, set last to the character
3) After the loop, return result

Try that, and see how you go.