#include <iostream>
#include <vector>

using namespace std;

vector<int> range(int start, int stop, int step = 1)
{
  vector<int> v;

  if ( step < 0 )
    for (int i = start; i > stop; i += step)
      v.emplace_back(i);
  
  if ( step > 0 )
    for (int i = start; i < stop; i += step)
      v.emplace_back(i);
  
  return v;
}

vector<int> range(int stop)
{
  return range(0, stop);
}

int main(int argc, char* argv[])
{
  if ( ! (2 <= argc && argc <= 4) )
  {
    cout << "Usage: " << argv[0] << " [START=0] STOP [STEP=1]" << endl;
    return 1;
  }

  try
  {
    cout << "[ ";
    switch (argc)
    {
      case 2: // One parameter
        for ( int i : range( stoi(argv[1])) )
          cout << i << " ";
        break;
        
      case 3: // Two parameters
        for ( int i : range( stoi(argv[1]),
                             stoi(argv[2])) )
          cout << i << " ";        
        break;
        
      case 4: // Three parameters
        for ( int i : range( stoi(argv[1]),
                             stoi(argv[2]),
                             stoi(argv[3])) )
          cout << i << " ";
        break;
    }
    cout << "]" << endl;
  }
  catch(exception& e)
  {
    cout << "ERROR: Arguments must be integer." << endl;
    return 1;    
  }
  
  return 0;
}