// -*- c++ -*-

#include <iostream>

#include <fstream>

#include <sage_graph.h>

#include <lemon/smart_graph.h>

#include <lemon/dimacs.h>

#include <lemon/time_measure.h>

//#include <graph_wrapper.h>

#include <lemon/max_flow.h>

//#include <preflow_res.h>

#include <for_each_macros.h>

using namespace lemon;

// Use a DIMACS max flow file as stdin.

// read_dimacs_demo < dimacs_max_flow_file

int main(int, char **) {

  typedef SageGraph MutableGraph;

  typedef SmartGraph Graph;

  //  typedef ListGraph Graph;

  typedef Graph::Node Node;

  typedef Graph::EdgeIt EdgeIt;

  Graph g;

  Node s, t;

  Graph::EdgeMap<int> cap(g);

  //readDimacsMaxFlow(std::cin, g, s, t, cap);

  readDimacs(std::cin, g, cap, s, t);

  Timer ts;

  Graph::EdgeMap<int> flow(g); //0 flow

  MaxFlow<Graph, int, Graph::EdgeMap<int>, Graph::EdgeMap<int> > 

    max_flow_test(g, s, t, cap, flow);

  {

    std::cout << "preflow ..." << std::endl;

    FOR_EACH_LOC(Graph::EdgeIt, e, g) flow.set(e, 0);

    ts.reset();

    max_flow_test.preflowPhase1(MaxFlow<Graph, int, Graph::EdgeMap<int>, Graph::EdgeMap<int> >::ZERO_FLOW);

    std::cout << "elapsed time: " << ts << std::endl;

    std::cout << "flow value: "<< max_flow_test.flowValue() << std::endl;

  }

  {

    std::cout << "preflow ..." << std::endl;

    FOR_EACH_LOC(Graph::EdgeIt, e, g) flow.set(e, 0);

    ts.reset();

    max_flow_test.preflowPhase1(MaxFlow<Graph, int, Graph::EdgeMap<int>, Graph::EdgeMap<int> >::ZERO_FLOW);

    std::cout << "elapsed time: " << ts << std::endl;

    std::cout << "flow value: "<< max_flow_test.flowValue() << std::endl;

  }

  return 0;

}