/* -*- 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;

 }