Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".
代码如下：
方法一：(java)
1 public class Solution { 2 public String reverseString(String s) { 3 4 StringBuffer t=new StringBuffer(s); 5 return t.reverse().toString(); 6 } 7 }
方法二：（c++）
1 class Solution { 2 public: 3 string reverseString(string s) { 4 reverse(s.begin(),s.end()); 5 return s; 6 } 7 };