题目:
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"]
题目的理解:
前后交换字符。
python实现
class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
length = len(s)
for index in range(length):
other = length - index - 1
if other <= index:
break
temp = s[index]
s[index] = s[other]
s[other] = temp
提交
![](https://img.haomeiwen.com/i1534405/01453474ffa9364f.png)
// END 好好学习!!!
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