Leetcode 344. Reverse String

344. Reverse String 

• Total Accepted: 56722
• Total Submissions: 96534
• Difficulty: Easy

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

思路：字符串反转，交换s[i]和s[s.size()-1-i]

代码：

class Solution {
public:
    string reverseString(string s) {
        int i=0,j=s.size()-1;
        while(i<j){
            swap(s[i++],s[j--]);
        }
        return s;
    }
};