344. 反转字符串

class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        i = 0
        j = len(s) - 1
        while i < j:
            s[i], s[j] = s[j], s[i]
            i += 1
            j -= 1

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来源： https://www.cnblogs.com/bidesen/p/16220241.html