Cues d'un supermercat (1)

#include <iostream>
#include <sstream>
#include <vector>
#include <queue>
using namespace std;

int main() {
  int n;
  string s;
  getline(cin, s);
  istringstream ss(s);
  ss >> n;
  vector<queue<string> > v(n);
  string linia, nom;
  for (int i = 0; i < n; ++i) {
    getline(cin, linia);
    istringstream lin(linia);
    while (lin >> nom) v[i].push(nom);
  }

  string activity;
  int cua;
  cout << "SORTIDES" << endl << "--------" << endl;
  while (cin >> activity) {
    if (activity == "SURT") {
      cin >> cua;
      cua--;
      if (cua >= 0 and cua < n) {
    if (not v[cua].empty()) {
      cout << v[cua].front() << endl;
      v[cua].pop();
    }
      }
    }
    else if (activity == "ENTRA") {
      cin >> nom >> cua;
      cua--;
      if (cua >= 0 and cua < n) {
    v[cua].push(nom);
      }
    }
  }
  cout << endl << "CONTINGUTS FINALS" << endl << "-----------------" << endl;
  for (int i = 0; i < n; ++i) {
    cout << "cua " << i+1 << ":";
    while (not v[i].empty()) {
      cout << " " << v[i].front();
      v[i].pop();
    }
    cout << endl;
  }
}