ReverseString.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019/11/10 11:04
# @Author  : tc
# @File    : ReverseString.py
"""
题号 344 反转字符串
编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。

不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。

 
示例 1：

输入：["h","e","l","l","o"]
输出：["o","l","l","e","h"]
示例 2：

输入：["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]

"""
from typing import List

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


if __name__ == '__main__':
    solution = Solution()
    s = ["h","e","l","l","o"]
    solution.reverseString(s)
    print(s)