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1 #include <iostream> |
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2 #include <fstream> |
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3 |
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4 #include <j_graph.h> |
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5 #include <dimacs_jgraph.hh> |
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6 #include <preflow_jgraph.h> |
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7 #include <time_measure.h> |
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8 |
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9 using namespace hugo; |
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10 |
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11 // Use a DIMACS max flow file as stdin. |
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12 // read_dimacs_demo < dimacs_max_flow_file |
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13 int main(int, char **) { |
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14 typedef JGraph::TrivNodeIt TrivNodeIt; |
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15 typedef JGraph::EdgeIt EdgeIt; |
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16 |
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17 JGraph G; |
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18 TrivNodeIt s, t; |
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19 JGraph::EdgeMap<int> cap(G); |
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20 readDimacsMaxFlow(std::cin, G, s, t, cap); |
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21 |
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22 std::cout << "preflow demo jacint ..." << std::endl; |
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23 |
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24 double mintime=1000000; |
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25 |
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26 for ( int i=1; i!=11; ++i ) { |
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27 double pre_time=currTime(); |
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28 preflow<JGraph, int> max_flow_test(G, s, t, cap); |
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29 double post_time=currTime(); |
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30 if ( mintime > post_time-pre_time ) mintime = post_time-pre_time; |
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31 } |
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32 |
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33 double pre_time=currTime(); |
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34 preflow<JGraph, int> max_flow_test(G, s, t, cap); |
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35 double post_time=currTime(); |
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36 |
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37 JGraph::NodeMap<bool> cut(G); |
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38 max_flow_test.minCut(cut); |
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39 int min_cut_value=0; |
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40 for(EdgeIt e=G.firstEdge(); e; G.next(e)) { |
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41 if (cut.get(G.tail(e)) && !cut.get(G.head(e))) min_cut_value+=cap.get(e); |
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42 } |
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43 |
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44 JGraph::NodeMap<bool> cut1(G); |
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45 max_flow_test.minMinCut(cut1); |
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46 int min_min_cut_value=0; |
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47 for(EdgeIt e=G.firstEdge(); e; G.next(e)) { |
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48 if (cut.get(G.tail(e)) && !cut.get(G.head(e))) |
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49 min_min_cut_value+=cap.get(e); |
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50 } |
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51 |
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52 JGraph::NodeMap<bool> cut2(G); |
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53 max_flow_test.maxMinCut(cut2); |
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54 int max_min_cut_value=0; |
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55 for(EdgeIt e=G.firstEdge(); e; G.next(e)) { |
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56 if (cut2.get(G.tail(e)) && !cut2.get(G.head(e))) |
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57 max_min_cut_value+=cap.get(e); |
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58 } |
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59 |
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60 std::cout << "min time of 10 runs: " << mintime << " sec"<< std::endl; |
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61 std::cout << "phase 0: " << max_flow_test.time-pre_time |
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62 << " sec"<< std::endl; |
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63 std::cout << "phase 1: " << post_time-max_flow_test.time |
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64 << " sec"<< std::endl; |
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65 std::cout << "flow value: "<< max_flow_test.maxFlow() << std::endl; |
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66 std::cout << "min cut value: "<< min_cut_value << std::endl; |
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67 std::cout << "min min cut value: "<< min_min_cut_value << std::endl; |
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68 std::cout << "max min cut value: "<< max_min_cut_value << |
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69 std::endl<< std::endl; |
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70 |
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71 return 0; |
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72 } |