Имена_и_фамилии_2.1

#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;
        }
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") {
            if (begin(sn) == sn.find(year))
                return LastName(year) + " with unknown first name";
            vector<string> v;
            for (const pair<int, string> &p : sn) {
                if (p.first <= year)
                    v.push_back(p.second);
                else
                    break;
            }
            reverse(begin(v), end(v));
            unique(begin(v), end(v));
            s = v[0] + " (" + v[1];
            for (int i = 2; i < v.size(); i++) {
                s += ", " + v[i];
            }
            s += ") with unknown first name";
            return s;
        }
        if (LastName(year) == "with unknown last name") {
            if (begin(fn) == fn.find(year))
                return FirstName(year) + " with unknown last name";
            vector<string> v;
            for (const pair<int, string> &p : fn) {
                if (p.first <= year)
                    v.push_back(p.second);
                else
                    break;
            }
            reverse(begin(v), end(v));
            unique(begin(v), end(v));
            s = v[0] + " (" + v[1];
            for (int i = 2; i < v.size(); i++) {
                s += ", " + v[i];
            }
            s += ") with unknown last name";
            return s;
        }
    }
};

int main() {
  Person person;
  person.ChangeLastName(1960, "Strkova");
  person.ChangeLastName(1961, "Strokova");
  person.ChangeLastName(1962, "Strkov");
  person.ChangeLastName(1963, "Strkov");
  person.ChangeLastName(1964, "Strko");
  person.ChangeLastName(1965, "Strk");
  //person.ChangeFirstName(1966, "Polina");
  person.ChangeLastName(1968, "Sergeeva");

  /*
  person.ChangeFirstName(1965, "Polina");
  person.ChangeFirstName(1966, "Polina");
  person.ChangeFirstName(1967, "Polina");
  person.ChangeFirstName(1968, "Polina");
  person.ChangeFirstName(1969, "Polin");
  person.ChangeFirstName(1970, "Poli");
  person.ChangeFirstName(1971, "Pol");*/
  cout << person.GetFullNameWithHistory(1990);

  return 0;
}