创建方式1:

pair<type,type> p(value1,value2);

pair<string, int> p("Tom", 20);
cout << "name:" << p.first << "age:" << p.second << endl;

创建方式2:

pair<type,type> p=make_pair(value1,value2);

	pair<string, int> p2 = make_pair("Jerry", 30);cout << "name:" << p2.first << "age:" << p2.second << endl;