2025-07-30 12:40:51 +0000 UTC

class Solution:
    def reverseStr(self, s: str, k: int) -> str:
        length = len(s)
        if length == 1:
            return s
        if length <= k:
            return s[::-1]
        res = []
        i = 0
        while i < length:
            new_i = i + 2 * k
            res.append(s[i+k-1:i:-1])
            res.append(s[i])
            res.append(s[i+k:new_i])
            i = new_i
        return "".join(res)