pair的例子

11.12 编写程序，读入string和int的序列，将每个string和int存入一个pair中，pair保存在一个vector中。

#include<iostream>
#include<vector>
#include<utility>
#include<string>
using namespace std;

int main()
{
    vector<pair<string,int>> vec;
    string str;
    int n;
    while(cin>>str&&cin>>n)
    {
        vec.push_back(make_pair(str,n));
    }
    cout<<"输出如下："<<endl;
    for(auto r:vec)
        cout<<r.first<<" "<<r.second<<endl;
    return ;
}

11.13 用三种方式实现构造pair

#include<iostream>
#include<vector>
#include<utility>
#include<string>
using namespace std;

int main()
{
    vector<pair<string,int>> vec;
    string str;
    int n;
    while(cin>>str&&cin>>n)
    {
　　　　 vec.push_back({str,n});
        vec.push_back(make_pair(str,n));
        vec.push_back(pair<string,int>(str,n));
        vec.push_back(pair<string,int>{str,n});
    }
    cout<<"输出如下："<<endl;
    for(auto r:vec)
        cout<<r.first<<" "<<r.second<<endl;
    return ;
}

11.14

#include<iostream>
#include<map>
#include<string>
#include<vector>
#include<utility>
using namespace std;

int main()
{
    vector<pair<string,string>> student;
    map<string,vector<pair<string,string>>> family;
    string firstname;
    string lastname;
    string birthday;
    /*while(cin>>lastname&&lastname!="0")
    {
        family.insert(make_pair(lastname,student));
    }*/
    while(cin>>lastname)
    {
        while(cin>>firstname&&cin>>birthday&&firstname!="q")
            family[lastname].push_back(make_pair(firstname,birthday));
    }

    for(auto s:family)
    {
        cout<<s.first<<" firstname ";
        for(auto r:s.second)
            cout<<r.first<<" "<<r.second<<" ";
        cout<<endl;
    }
     return ;
}