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 s 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。 示例 1: 输入:s = ["h","e","l","l","o"] 输出:["o","l","l","e","h"] 示例 2: 输入:s = ["H","a","n","n","a","h"] 输出:["h","a","n","n","a","H"]
class Solution: def reverseString(self, s: List[str]) -> None: """ 解题思路: 举例: 如果list的长度为奇数,[1,2,3,4,5],找到需要反转的中间数据为 len(s) // 2 如果list的长度为偶数,[1,2,3,4,5,6],找到需要反转的中间数据依旧为len(s) // 2, 可得出一个结论,无需判断list 长度的集偶性,代码如下: """ length = len(s) d = 1 for i in range(int(length // 2)): s[i], s[i-d] = s[i-d], s[i] d += 2
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