【转】http://blog.youkuaiyun.com/zxy_snow/article/details/6168531
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
using namespace std;
int main()
{
int ncases;
string s;
int i;
cin >> ncases;
getchar();
while( ncases-- )
{
getline(cin,s);
for(i=s.size()-1; i>=0; i--)
cout << s[i];
cout << endl;
}
return 0;
}