LeetCode 344 _ 反转字符

1. 题目描述

2. 代码

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

思路: 定义双指针, 头尾交换值.

3. 整理

a = 10
b = 5
a,b = b,a
print(a,b)

5 10

Python可以直接交换2个值.