344. Reverse String

C++

class Solution {
public:
    string reverseString(string s) {
        string result="";
        for(int i=1;i<=s.length();i++)
        {
            result+=s[s.length()-i];
        }
        return result;
    }
};

Java

public class Solution {
    public String reverseString(String s) {
         return new StringBuffer(s).reverse().toString();
    }
}

Javascript

/**
 * @param {string} s
 * @return {string}
 */
var reverseString = function(s) {
    return s.split("").reverse().join("");
};

最优解

位交换