#include <iostream>
#include <map>

using namespace std;

int main()
{
    map<int, string> m;
    m.insert(make_pair(1, "disen"));
    m.insert(make_pair(2, "lucy"));
    m.insert(make_pair(3, "jack"));

    map<int, string>::const_iterator it = m.find(3);

    if (it == m.end())
    {
        cout << "未查找到" << endl;
    }
    else
    {
        const pair<int, string> &p = *it;
        cout << p.first << ", " << p.second << endl;
    }

    return 0;
}