Имена_и_фамилии

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

class Person {
private:
    map<int, pair<string, string>> m;
public:
    void ChangeFirstName(const int &year, const string &first_name) {
        m[year].first = first_name;
    }
    void ChangeLastName(const int &year, const string &last_name) {
        m[year].second = last_name;
    }
    string GetFullName(const int &year) {
        auto n = *begin(m);
        if (year < n.first)
            return "Incognito";
        string first_name, last_name;
        for (const pair<int, pair<string, string>> &p : m) {
            if (p.first > year && first_name.empty())
                return last_name + " with unknown first name";
            if (p.first > year && last_name.empty())
                return first_name + " with unknown last name";
            if (p.first > year)
                return first_name + ' ' + last_name;
            if (!p.second.first.empty())
                first_name = p.second.first;
            if (!p.second.second.empty())
                last_name = p.second.second;
        }
        return first_name + ' ' + last_name;
    }
};

int main() {
      Person person;

      person.ChangeFirstName(1965, "Polina");
      for (int year : {1964, 1965, 1966, 1967}) {
        cout << person.GetFullName(year) << endl;
      }

  return 0;
}