#include <iostream>

 #include <lemon/list_graph.h>

 #include <lemon/dijkstra.h>

 //#include <lemon/graph_writer.h>

 using namespace lemon;

 int main (int, char*[])

 {

     typedef ListGraph Graph;

     typedef Graph::Node Node;

     typedef Graph::Edge Edge;

     typedef Graph::EdgeMap<int> LengthMap;

     Graph g;

     //An example from Ahuja's book

     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 len(g);

     len.set(s_v2, 10);

     len.set(s_v3, 10);

     len.set(v2_v4, 5);

     len.set(v2_v5, 8);

     len.set(v3_v5, 5);

     len.set(v4_t, 8);

     len.set(v5_t, 8);

     std::cout << "This program is a simple demo of the LEMON Dijkstra class."<<std::endl;

     std::cout << "We calculate the shortest path from node s to node t in a graph."<<std::endl;

     std::cout <<std::endl;

     std::cout << "The id of s is " << g.id(s)<< ", the id of t is " << g.id(t)<<"."<<std::endl;

     std::cout << "Dijkstra algorithm test..." << std::endl;

     Dijkstra<Graph, LengthMap> dijkstra_test(g,len);

     dijkstra_test.run(s);

     std::cout << "The distance of node t from node s: " << dijkstra_test.dist(t)<<std::endl;

     std::cout << "The shortest path from s to t goes through the following nodes (the first one is t, the last one is s): "<<std::endl;

     for (Node v=t;v != s; v=dijkstra_test.predNode(v)){

 	std::cout << g.id(v) << "<-";

     }

     std::cout << g.id(s) << std::endl;	

     return 0;

 }