map::begin

#include <iostream>
#include <map>

int main() {
    std::map<int, std::string> myMap;

    myMap[1] = "One";
    myMap[2] = "Two";
    myMap[3] = "Three";

    std::map<int, std::string>::iterator it = myMap.begin();

    std::cout << "Key: " << it->first << ", Value: " << it->second << std::endl;

    return 0;
}