1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/work/jacint/preflow.cc	Sat Feb 21 21:01:22 2004 +0000
     1.3 @@ -0,0 +1,66 @@
     1.4 +#include <iostream>
     1.5 +#include <fstream>
     1.6 +
     1.7 +#include <list_graph.hh>
     1.8 +#include <dimacs.hh>
     1.9 +#include <preflow.h>
    1.10 +#include <time_measure.h>
    1.11 +
    1.12 +using namespace hugo;
    1.13 +
    1.14 +// Use a DIMACS max flow file as stdin.
    1.15 +// read_dimacs_demo < dimacs_max_flow_file
    1.16 +int main(int, char **) {
    1.17 +  typedef ListGraph::NodeIt NodeIt;
    1.18 +  typedef ListGraph::EachEdgeIt EachEdgeIt;
    1.19 +
    1.20 +  ListGraph G;
    1.21 +  NodeIt s, t;
    1.22 +  ListGraph::EdgeMap<int> cap(G);
    1.23 +  readDimacsMaxFlow(std::cin, G, s, t, cap);
    1.24 +
    1.25 +  std::cout << "preflow demo ..." << std::endl;
    1.26 +  
    1.27 +  double mintime=1000000;
    1.28 +
    1.29 +  for ( int i=1; i!=11; ++i ) {
    1.30 +    double pre_time=currTime();
    1.31 +    preflow<ListGraph, int> max_flow_test(G, s, t, cap);
    1.32 +    double post_time=currTime();
    1.33 +    if ( mintime > post_time-pre_time ) mintime = post_time-pre_time;
    1.34 +  }
    1.35 +
    1.36 +  preflow<ListGraph, int> max_flow_test(G, s, t, cap);
    1.37 +  
    1.38 +  ListGraph::NodeMap<bool> cut(G);
    1.39 +  max_flow_test.minCut(cut); 
    1.40 +  int min_cut_value=0;
    1.41 +  for(EachEdgeIt e=G.first<EachEdgeIt>(); e.valid(); ++e) {
    1.42 +    if (cut.get(G.tail(e)) && !cut.get(G.head(e))) min_cut_value+=cap.get(e);
    1.43 +  }
    1.44 +
    1.45 +  ListGraph::NodeMap<bool> cut1(G);
    1.46 +  max_flow_test.minMinCut(cut1); 
    1.47 +  int min_min_cut_value=0;
    1.48 +  for(EachEdgeIt e=G.first<EachEdgeIt>(); e.valid(); ++e) {
    1.49 +    if (cut.get(G.tail(e)) && !cut.get(G.head(e))) 
    1.50 +      min_min_cut_value+=cap.get(e);
    1.51 +  }
    1.52 +
    1.53 +  ListGraph::NodeMap<bool> cut2(G);
    1.54 +  max_flow_test.maxMinCut(cut2); 
    1.55 +  int max_min_cut_value=0;
    1.56 +  for(EachEdgeIt e=G.first<EachEdgeIt>(); e.valid(); ++e) {
    1.57 +    if (cut2.get(G.tail(e)) && !cut2.get(G.head(e))) 
    1.58 +      max_min_cut_value+=cap.get(e);
    1.59 +      }
    1.60 +  
    1.61 +  std::cout << "min time of 10 runs: " << mintime << " sec"<< std::endl; 
    1.62 +  std::cout << "flow value: "<< max_flow_test.maxFlow() << std::endl;
    1.63 +  std::cout << "min cut value: "<< min_cut_value << std::endl;
    1.64 +  std::cout << "min min cut value: "<< min_min_cut_value << std::endl;
    1.65 +  std::cout << "max min cut value: "<< max_min_cut_value << 
    1.66 +    std::endl<< std::endl;
    1.67 +  
    1.68 +  return 0;
    1.69 +}