#include <map>

#include <iostream>

using namespace std;

void main()

{

    map <string, int> dic;

    dic.insert(pair<string, int>("a", 5));

    dic.insert(pair<string, int>("b", 2));

    dic.insert(pair<string, int>("a", 3)); //allow duplicate key

    dic.insert(pair<string, int>("c", 7));

    dic.insert(pair<string, int>("d", 9));

    dic.insert(pair<string, int>("e", 20));

    dic["c"] = 8;

    map<string,int>::iterator finder;;

    finder=dic.find("c");

    if(finder==dic.end())

        cout<<"we do not find 112"<<endl;

    else

    {

        cout<<"total:"<<dic.size()<<endl;

        cout<<"wo find c:"<<dic["c"]<<endl;

        dic.erase(finder); //delete

        cout<<"total:"<<dic.size()<<endl;

    }

    int c =0;

    c = getchar();

}