LeetCode 344. 反转字符串
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2022-03-11 21:40:43
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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"]
class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
start = 0
end = len(s) - 1
while start < end:
s[start], s[end] = s[end], s[start]
start += 1
end -= 1