#include <iostream>
#include <map>
 
int main() {
    std::map<int, std::string> m {
        { 1, "hello" },
        { 2, "world" }
    };
    m.emplace(2, "everyone");
    
    for (auto p: m)
        std::cout << p.first << ' ' << p.second << std::endl;
    std::cout << std::endl;
    
    std::multimap<int, std::string> mm {
        { 1, "hello" },
        { 2, "world" }
    };
    mm.emplace(2, "everyone");
    
    for (auto p: mm)
        std::cout << p.first << ' ' << p.second << std::endl;
}