如何遍历/迭代STL Map？

#include<iostream>
#include <map>

int main() {
    std::map<int, std::string> my_map;
    my_map[1] = "one";
    my_map[2] = "two";
    my_map[3] = "three";

    for (std::map<int, std::string>::iterator it = my_map.begin(); it != my_map.end(); ++it) {
        std::cout << "Key: " << it->first << ", Value: " << it->second<< std::endl;
    }

    return 0;
}

#include<iostream>
#include <map>

int main() {
    std::map<int, std::string> my_map;
    my_map[1] = "one";
    my_map[2] = "two";
    my_map[3] = "three";

    for (const auto &pair : my_map) {
        std::cout << "Key: "<< pair.first << ", Value: "<< pair.second<< std::endl;
    }

    return 0;
}