图解LeetCode第 344 号问题：反转字符串

 1// 344. Reverse String
 2// https://leetcode.com/problems/reverse-string/description/
 3// Two Pointers
 4// 时间复杂度: O(n)
 5// 空间复杂度: O(1)
 6class Solution {
 7public:
 8    string reverseString(string s) {
 9
10        int i = 0, j = s.size() - 1;
11        while(i < j){
12            swap(s[i], s[j]);
13            i ++;
14            j --;
15        }
16
17        return s;
18    }
19};