multimap_name.emplace(key, element)

//C++程序，说明
//multimap::emplace()方法
#include
using namespace std;
 
int main()
{
 
    //初始化容器
    multimap<int, int> mp;
 
    //以随机顺序插入元素
    mp.emplace(2, 30);
    mp.emplace(1, 40);
    mp.emplace(2, 60);
    mp.emplace(2, 20);
    mp.emplace(1, 50);
    mp.emplace(4, 50);
 
    //输出元素
    cout << "\nThe multimap is : \n";
    cout << "KEY\tELEMENT\n";
    for (auto itr = mp.begin(); itr != mp.end(); itr++)
        cout << itr->first << "\t" << itr->second << endl;
 
    return 0;
}

The multimap is : 
KEY    ELEMENT
1    40
1    50
2    30
2    60
2    20
4    50