Leetcode 344. 反转字符串(Python3)

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"]

---

思路：交换，或直接py取反

class Solution:
    def reverseString(self, s):
        """
        :type s: List[str]
        :rtype: void Do not return anything, modify s in-place instead.
        """
        l = len(s)
        for i in range(l//2):
            s[i],s[l-1-i] = s[l-1-i],s[i]
        #s[:] = s[::-1]