2026-02-03 11:11:12 +0000 UTC

Reverse Letters Then Special Characters in a String
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Code

class Solution:
    def reverseByType(self, s: str) -> str:
        res = list(s)
        length = len(s)
        alpha, spec = length - 1, length - 1
        for i, char in enumerate(s):
            if char.isalpha():
                while not s[alpha].isalpha():
                    alpha -= 1
                target = alpha
                alpha -= 1
            else:
                while s[spec].isalpha():
                    spec -= 1
                target = spec
                spec -= 1
            res[i], res[target] = s[target], char
        return "".join(res)