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int main() {
  int n;
  cout << "Ile elementow ma tablica?\n n = ";
  cin >> n;
  int* L = new int[n];
  cout << "Podaj elementy:" << endl;
  for (int i = 0; i < n; i++)
    cin >> L[i];
  cout << wyliczKoszt(L, n) << endl;
  delete[] L;
  system("pause");
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:3:3: error: ‘cout’ was not declared in this scope
   cout << "Ile elementow ma tablica?\n n = ";
   ^~~~
prog.cpp:4:3: error: ‘cin’ was not declared in this scope
   cin >> n;
   ^~~
prog.cpp:6:32: error: ‘endl’ was not declared in this scope
   cout << "Podaj elementy:" << endl;
                                ^~~~
prog.cpp:9:27: error: ‘wyliczKoszt’ was not declared in this scope
   cout << wyliczKoszt(L, n) << endl;
                           ^
prog.cpp:11:17: error: ‘system’ was not declared in this scope
   system("pause");
                 ^

Standard output is empty