Sorteio amigo secreto/oculto em C++ 11

sorteio-amigo-secreto.cpp

// Autor Leonardo Antunes, 2019
#include <algorithm> // std::shuffle
#include <chrono>    // std::chrono::system_clock
#include <iostream>
#include <random> // std::default_random_engine
#include <string>
#include <vector>

using namespace std;

vector<string> shuffle_names(vector<string> &names) {
  // create a copy of names vector and shuffle
  vector<string> selecteds(names);
  // obtain a time-based seed:
  unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
  auto rng = std::default_random_engine(seed);
  shuffle(selecteds.begin(), selecteds.end(), rng);
  return selecteds;
}

int main() {
  int n;
  vector<string> names;

  cout << "Digite a quantidade de pessoas do Amigo Secreto? ";
  cin >> n;
  // clear input buffer
  cin.clear();
  cin.ignore(10000, '\n');

  if (n % 2 == 0) {
    cout << "\nO número de participantes é: " << n;
  } else {
    cout << "\nO número impar inviabiliza o sorteio! Digite um número par.\n";
    return 0;
  }

  // get names
  for (int count = 0; count < n; ++count) {
    cout << "\nDigite o nome de um amigo: ";
    string name;
    getline(cin, name);
    names.push_back(name);
  }

  vector<string> selecteds = shuffle_names(names);

  // verify
  int verified = 0;
  while (verified != n) {
    verified = 0;
    for (int count = 0; count < n; ++count) {
      if (names[count] != selecteds[count]) {
        verified++;
      } else {
        selecteds = shuffle_names(names);
        break;
      }
    }
  }

  // print
  for (int count = 0; count < n; ++count) {
      cout << "Convidado: " << names[count] << ", Amigo: " << selecteds[count] << endl;
  }
  return 0;
}