344. 反转字符串
https://leetcode-cn.com/problems/reverse-string/
解法一:
用直接逆序s[::-1]
的方法发现行不通,还是老实交换吧:
class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
i, j = 0, len(s)-1
while i < j:
s[i], s[j] = s[j], s[i]
i += 1
j -= 1
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