LeetCode_344. Reverse String

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

Example
Given s=”hello”, return “olleh”.
C++:

class Solution{
public:
    string reverseString(string s){
        std::string sr(s.rbegin(), s.rend());
        return sr;
    }
};

Top Solution

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