Имена_и_фамилии_2

#include <bits/stdc++.h>
using namespace std;

class Person {
private:
    map<int, string> fn;
    map<int, string> sn;
    string FirstName(const int &year) {
        string first_name = " with unknown first name";
        for (const pair<int, string> &p : fn) {
            if (p.first <= year)
                first_name = p.second;
            else
                break;
        }
        return first_name;
    }
    string LastName(const int &year) {
            string last_name = "with unknown last name";
            for (const pair<int, string> &p : sn) {
                if (p.first <= year)
                    last_name = p.second;
                else
                    break;
            }
            return last_name;
        }
    void FirstNameHistory(vector<string> &v) {
        if (fn.size() == 1)
            v.assign(1, " ");
    }
public:
    void ChangeFirstName(const int &year, const string &first_name) {
        fn[year] = first_name;
    }
    void ChangeLastName(const int &year, const string &last_name) {
        sn[year] = last_name;
    }
    string GetFullName(const int &year) {
        if (FirstName(year) == " with unknown first name" && LastName(year) == "with unknown last name")
            return "Incognito";
        if (FirstName(year) == " with unknown first name")
            return LastName(year) + FirstName(year);
        return FirstName(year) + ' ' + LastName(year);
    }
    string GetFullNameWithHistory(const int &year) {
        string s = GetFullName(year);
        if (s == "Incognito")
            return "Incognito";
        if (FirstName(year) == " with unknown first name") {
            s = LastName(year);
            vector<string> v(1, ' ');
            for (pair<int, string> &p : sn) {
                if (p.first < year)
                    v.push_back(p.second);
            }
            reverse(begin(v), end(v));
            unique(begin(v), end(v));

        }

    }
};

int main() {
  Person person;
  person.ChangeLastName(1960, "Strkova");
  person.ChangeLastName(1961, "Strkova");
  person.ChangeLastName(1962, "Strkov");
  person.ChangeLastName(1963, "Strko");
  person.ChangeLastName(1964, "Strk");
  person.ChangeFirstName(1965, "Polina");
  person.ChangeLastName(1967, "Sergeeva");
  cout << person.GetFullName(1965);

  return 0;
}