ReverseString [source code]

public class ReverseString {
    public String reverseString(String s) {
        String result = "";
        for (int i = 0; i < s.length(); i++ ){
            result += s.charAt(s.length()-1-i);
        }
        return result;
    }
}

这个版本的有一个特别长的 testcase 超时,没有过;

Problem Description

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

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