#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.set(s_v2, 10);

   length.set(s_v3, 10);

   length.set(v2_v4, 5);

   length.set(v2_v5, 8);

   length.set(v3_v5, 5);

   length.set(v4_t, 8);

   length.set(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;

 }