/* -*- C++ -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2003-2008

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

///\ingroup demos

///\file

///\brief LEMON style "Hello World!" program

///

/// This program is intended to be a "Hello World!" program that shows

/// the very basic notions of the LEMON library: \ref graphs "graphs" and

/// \ref maps-page "maps". Click on the links to read more about these.

///

/// \include hello_lemon.cc

#include <iostream>

#include <lemon/list_graph.h>

int main()

{

  typedef lemon::ListGraph Graph;

  typedef Graph::EdgeIt EdgeIt;

  typedef Graph::Edge Edge;

  typedef Graph::NodeIt NodeIt;

  typedef Graph::Node Node;

  typedef Graph::EdgeMap<int> LengthMap;

  using lemon::INVALID;

  Graph g;

  Node s=g.addNode();

  Node v2=g.addNode();

  Node v3=g.addNode();

  Node v4=g.addNode();

  Node v5=g.addNode();

  Node t=g.addNode();

  Edge s_v2=g.addEdge(s, v2);

  Edge s_v3=g.addEdge(s, v3);

  Edge v2_v4=g.addEdge(v2, v4);

  Edge v2_v5=g.addEdge(v2, v5);

  Edge v3_v5=g.addEdge(v3, v5);

  Edge v4_t=g.addEdge(v4, t);

  Edge v5_t=g.addEdge(v5, t);

  LengthMap length(g);

  length[s_v2]=10;

  length[s_v3]=10;

  length[v2_v4]=5;

  length[v2_v5]=8;

  length[v3_v5]=5;

  length[v4_t]=8;

  length[v5_t]=8;

  std::cout << "Hello World!" << std::endl;

  std::cout <<  std::endl;

  std::cout << "This is library LEMON here! We have a graph!" << std::endl;

  std::cout <<  std::endl;

  std::cout << "Nodes:";

  for (NodeIt i(g); i!=INVALID; ++i)

    std::cout << " " << g.id(i);

  std::cout << std::endl;

  std::cout << "Edges:";

  for (EdgeIt i(g); i!=INVALID; ++i)

    std::cout << " (" << g.id(g.source(i)) << "," << g.id(g.target(i)) << ")";

  std::cout << std::endl;

  std::cout <<  std::endl;

  std::cout << "There is a map on the edges (length)!" << std::endl;

  std::cout <<  std::endl;

  for (EdgeIt i(g); i!=INVALID; ++i)

    std::cout << "length(" << g.id(g.source(i)) << ","

	      << g.id(g.target(i)) << ")="<<length[i]<<std::endl;

  std::cout << std::endl;

}