#include <iostream>

 #include <string>

 #include <boost/config.hpp>

 #include <boost/graph/push_relabel_max_flow.hpp>

 #include <boost/graph/adjacency_list.hpp>

 #include <boost/graph/read_dimacs.hpp>

 #include <boost/graph/graph_utility.hpp>

 #include <time_measure.h>

 // Use a DIMACS network flow file as stdin.

 // max_flow < max_flow.dat

 int main()

 {

   using namespace boost;

   typedef adjacency_list_traits<vecS, vecS, directedS> Traits;

   typedef adjacency_list<listS, vecS, directedS, 

     property<vertex_name_t, std::string>,

     property<edge_capacity_t, long,

       property<edge_residual_capacity_t, long,

         property<edge_reverse_t, Traits::edge_descriptor> > >

   > Graph;

   Graph g;

   property_map<Graph, edge_capacity_t>::type 

     capacity = get(edge_capacity, g);

   property_map<Graph, edge_reverse_t>::type 

     rev = get(edge_reverse, g);

   property_map<Graph, edge_residual_capacity_t>::type 

     residual_capacity = get(edge_residual_capacity, g);

   Traits::vertex_descriptor s, t;

   read_dimacs_max_flow(g, capacity, rev, s, t);

   std::cout << "preflow demo (BOOST)..." << endl;

   double pre_time=currTime();

   long flow = push_relabel_max_flow(g, s, t);

   double post_time=currTime();

   //std::cout << "maximum flow: " << std::endl;

   //graph_traits<Graph>::vertex_iterator u_iter, u_end;

   //graph_traits<Graph>::out_edge_iterator ei, e_end;

   //for (tie(u_iter, u_end) = vertices(g); u_iter != u_end; ++u_iter)

   //  for (tie(ei, e_end) = out_edges(*u_iter, g); ei != e_end; ++ei)

   //    if (capacity[*ei] > 0)

   //      std::cout << "f " << *u_iter << " " << target(*ei, g) << " " 

   //                << (capacity[*ei] - residual_capacity[*ei]) << std::endl;

   //

   //std::cout << std::endl;

   std::cout << "elapsed time: " << post_time-pre_time << " sec"<< std::endl; 

   std::cout << "flow value: " << flow << std::endl;

   return 0;

 }