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. """ beg = 0 end = len(s)-1 while beg < end: s[beg], s[end] = s[end], s[beg] beg += 1 end -= 1
执行用时 : 216 ms, 在Reverse String的Python3提交中击败了51.54% 的用户
内存消耗 : 17.5 MB, 在Reverse String的Python3提交中击败了78.41% 的用户
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