查找共同好友

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


class Person
{
     public:

    string name;
    int num;
    int age;

    Person():name(""),num(0),age(0){
    }

    friend bool operator==(const Person &a, const  Person &b)
    {
        return a.name== b.name &&
               a.num == b.num &&
               a.age == b.age;
    }
    friend ostream& operator<<(ostream& out,const Person &obj)
    {
        out<<obj.name<<" "<<obj.num<<" "<<obj.age;
        return out;
    }
    friend istream& operator>>(istream& in, Person &record)
    {
        in>>record.name>>record.num>>record.age;
        return in;
    }
};

typedef multimap<string ,Person*>::iterator ssit;


int main()
{
    multimap<string, Person*> Record;
    string Name;
    Person Friend;
    int a=0,b;

    cin>>a;
    Person *r = new Person[a];

    for(int i=0;i<a;i++)
    {
        cin>>Name>>Friend;
        r[i] = Friend;
        Record.insert(make_pair(Name,&r[i]));
    }

    cin>>b;
    vector<string> NamesToFind;
    vector<Person> Names_Finded;
    for(int i=0;i<b;i++)
    {
        cin>>Name;
        if( count(NamesToFind.begin(),NamesToFind.end(),Name)==0 )
        NamesToFind.insert(NamesToFind.begin(),Name);
    }

    vector<string>::iterator it1=NamesToFind.begin();
    vector<string>::iterator it2=NamesToFind.end();

    for(;it1!=it2;++it1)
    {
        ssit beg = Record.lower_bound(*it1);
        ssit end = Record.upper_bound(*it1);
        while(beg!=end)
        {
            Names_Finded.push_back(*(beg->second));
            ++beg;
        }
    }
    vector<string> publicfriends;

    for(unsigned int i=0;i<Names_Finded.size();i++)
    {
        if(
        count(Names_Finded.begin(),Names_Finded.end(),Names_Finded[i])
        ==b &&
    count(publicfriends.begin(),publicfriends.end(),Names_Finded[i].name)
    ==0  )
            {
                publicfriends.push_back(Names_Finded[i].name);
                cout<<Names_Finded[i]<<endl;
            }
    }
    if(publicfriends.size()==0)
         cout<<"NO";
    return 0;
}