Reverse String Solutions in C++

// Source : https://leetcode.com/problems/reverse-string/
// Author : Hao Chen
// Date   : 2016-05-29



class Solution {
public:
    string reverseString(string s) {
        int len = s.size();
        for (int i=0; i<len/2; i++) {
           char ch = s[i];
           s[i] = s[len-i-1];
           s[len-i-1] = ch;
        } 
        return s;
    }
};

/// Source : https://leetcode.com/problems/reverse-string/description/
/// Author : liuyubobobo
/// Time   : 2018-06-04

#include <iostream>

using namespace std;

/// Two Pointers
/// Time Complexity: O(n)
/// Space Complexity: O(1)
class Solution {
public:
    string reverseString(string s) {

        int i = 0, j = s.size() - 1;
        while(i < j){
            swap(s[i], s[j]);
            i ++;
            j --;
        }

        return s;
    }
};


int main() {

    cout << Solution().reverseString("hello") << endl;

    return 0;
}