字符串逆序

Posted 2020-07-20

题目：

Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".

思路：首尾字符交换

c++代码：

 1 class Solution {
 2 public:
 3     string reverseString(string s) {
 4         int len = s.size();
 5         for (int i = 0; i < len/2; i++) {
 6             char t = s[i];
 7             s[i] = s[len-i-1];
 8             s[len-i-1] = t;
 9         }
10         return s;
11     }
12 };