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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file basic_priority_queue_example.cpp

 * A basic example showing how to use priority queues.

 */

/**

 * This example shows how to use priority queues. It defines a

 * function performing a sequence of operations on

 * a generic container. It then calls this function with some containers.

 */

#include <cassert>

#include <iostream>

#include <ext/pb_ds/priority_queue.hpp>

using namespace std;

using namespace __gnu_pbds;

// The following function performs a sequence of operations on a

// priority queue object storing integers.

template<class Cntnr>

void

some_op_sequence(Cntnr& r_c)

{

  assert(r_c.empty());

  assert(r_c.size() == 0);

  for (size_t i = 0; i < 10; ++i)

    r_c.push(i);

  cout << endl << "All values in the container:" << endl;

  typedef typename Cntnr::const_iterator const_iterator;

  for (const_iterator it = r_c.begin(); it != r_c.end();  ++it)

    cout << *it << endl;

  assert(!r_c.empty());

  assert(r_c.size() == 10);

  cout << "Popping all values: " << endl;

  while (!r_c.empty())

    {

      cout << r_c.top() << endl;

      r_c.pop();

    }

  assert(r_c.empty());

  assert(r_c.size() == 0);

  cout << endl;

}

int main()

{

  {

    // Perform operations on a pairing-heap queue.

    cout << "Pairing heap" << endl;

    __gnu_pbds::priority_queue<int, less<int>, pairing_heap_tag> c;

    some_op_sequence(c);

  }

  {

    // Perform operations on a binomial-heap queue.

    cout << "Binomial heap" << endl;

    __gnu_pbds::priority_queue<int, less<int>, binomial_heap_tag> c;

    some_op_sequence(c);

  }

  {

    // Perform operations on a binomial-heap queue.

    cout << "Redundant-counter binomial heap" << endl;

    __gnu_pbds::priority_queue<int, less<int>, rc_binomial_heap_tag> c;

    some_op_sequence(c);

  }

  {

    // Perform operations on a binomial-heap queue.

    cout << "Binary heap" << endl;

    __gnu_pbds::priority_queue<int, less<int>, binary_heap_tag> c;

    some_op_sequence(c);

  }

  {

    // Perform operations on a thin-heap queue.

    cout << "Thin heap" << endl;

    __gnu_pbds::priority_queue<int, less<int>, thin_heap_tag> c;

    some_op_sequence(c);

  }

  return 0;

}