#include <iostream>
#include <map>
#include <string>
using namespace std;

void main(){
   map<string,string> students;
   students["ken"]="Moore";
   students["steve"]="DiMarzio";
   students["a"]="mmm";
   students["z"]="ttt";
   students["steven"] = "Bibro";
   students["steven"] = "Duplicate";// try dup key
   pair<string,string> p;
   p.first = "veronica";
   p.second = "Paramonova";
   students.insert(p);
   cout << students["steve"] << endl;
   map<string,string>::iterator i;
   for(i = students.begin(); i!= students.end(); i++){
	   p = *i;// derefernce of a map iterator = pair.
	   cout << p.first << " " << p.second << endl;
   }
}