Imena i familii - 3

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

class Person {
public:
    Person(const string& first_name, const string& last_name, int year){
        birth_f = first_name;
        first_name_changes[year] = first_name;
        birth_l = last_name;
        last_name_changes[year] = last_name;
        birth_y = year;
    }
  void ChangeFirstName(int year, const string& first_name) {
    // добавить факт изменения имени на first_name в год year
            if(year >= birth_y){

            first_name_changes[year] = first_name;
            }

  }
  void ChangeLastName(int year, const string& last_name) {
    // добавить факт изменения фамилии на last_name в год year
            if(year >= birth_y){

            last_name_changes[year] = last_name;
            }

  }
  string GetFullName(int year) const{
       if(year< birth_y){
            return("No person");
       }
       string first_name="", last_name="",ans="";
       for(auto i : first_name_changes ){
            if(i.first>year) break;
            first_name = i.second;
       }
       for(auto i : last_name_changes ){
            if(i.first>year) break;
            last_name = i.second;
       }
       if(first_name!=""){
            if(last_name!=""){
                ans=first_name;
                ans+=" ";
                ans+=last_name;
            }
            else{
                ans+=first_name;
                ans+=" with unknown last name";
            }
       }
       else{
            if(last_name!=""){
                ans=last_name;
                ans+=" with unknown first name";
            }
            else{
                ans="Incognito";
            }
       }
       return (ans);

  }
  string GetFullNameWithHistory(int year)const {
      if(year< birth_y){
            return("No person");
       }
        vector <pair<int,string> > f_history, l_history;
       string first_name="", last_name="",ans="";
       string current_f="", current_l="";
       for(auto i : first_name_changes ){
            if(i.first>year) break;
            first_name = i.second;
            f_history.push_back(i);
       }
       for(auto i : last_name_changes ){
            if(i.first>year) break;
            last_name = i.second;
            l_history.push_back(i);
       }

        vector <string> res1, res2;
        for(auto i : f_history){
            if(i.first >year) break;
            if(current_f!= i.second){
                res1.push_back(i.second);
            }
            current_f=i.second;
        }
        for(auto i : l_history){
            if(i.first>year) break;
            if(current_l!=i.second){
                res2.push_back(i.second);
            }
            current_l=i.second;
        }
        if(res1.size()){
            if(res2.size()){
                    ans+= res1[res1.size()-1];
                    ans+=' ';
                    res1.pop_back();
                    if(res1.size()){
                        ans+="(";
                        ans+=res1[res1.size()-1];
                        res1.pop_back();

                    while(res1.size()){
                        ans+=", ";
                        ans+=res1[res1.size()-1];
                        res1.pop_back();
                    }
                    ans+=") ";
                    }
                    ans+= res2[res2.size()-1];
                    res2.pop_back();
                    if(res2.size()){
                        ans+=" (";
                        ans+=res2[res2.size()-1];
                        res2.pop_back();
                    while(res2.size()){
                        ans+=", ";
                        ans+=res2[res2.size()-1];
                        res2.pop_back();
                    }
                    ans+=")";
                    }

            }
            else{
                ans+= res1[res1.size()-1];
                    ans+=' ';
                    res1.pop_back();
                    if(res1.size()){
                        ans+="(";
                        ans+=res1[res1.size()-1];
                        res1.pop_back();

                    while(res1.size()){
                        ans+=", ";
                        ans+=res1[res1.size()-1];
                        res1.pop_back();
                    }
                    ans+=") ";
                    }
                ans+="with unknown last name";
            }

        }
        else{
            if(res2.size()){
            ans+= res2[res2.size()-1];
                    res2.pop_back();
                    if(res2.size()){
                        ans+=" (";
                        ans+=res2[res2.size()-1];
                        res2.pop_back();
                    while(res2.size()){
                        ans+=", ";
                        ans+=res2[res2.size()-1];
                        res2.pop_back();
                    }
                    ans+=")";
                    }
                ans+=" with unknown first name";
            }
            else{
                ans+="Incognito";
            }
        }


       return (ans);
  }
private:
  map <int, string> first_name_changes;
  map <int, string> last_name_changes;
  string birth_f, birth_l;
  int birth_y;
};

int main() {
  Person person("Polina", "Sergeeva", 1960);
  for (int year : {1959, 1960}) {
    cout << person.GetFullNameWithHistory(year) << endl;
  }

  person.ChangeFirstName(1965, "Appolinaria");
  person.ChangeLastName(1967, "Ivanova");
  for (int year : {1965, 1967}) {
    cout << person.GetFullNameWithHistory(year) << endl;
  }

  return 0;
}