[82] | 1 | #include <iostream> |
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| 2 | #include <fstream> |
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| 3 | |
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| 4 | #include <list_graph.hh> |
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| 5 | #include <dimacs.hh> |
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| 6 | #include <preflow_push_max_flow.h> |
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| 7 | #include <time_measure.h> |
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| 8 | |
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| 9 | using namespace marci; |
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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 ListGraph::NodeIt NodeIt; |
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| 15 | typedef ListGraph::EachEdgeIt EachEdgeIt; |
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| 16 | |
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| 17 | ListGraph G; |
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| 18 | NodeIt s, t; |
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| 19 | ListGraph::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 | //ListGraph::EdgeMap<int> flow(G); //0 flow |
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| 24 | |
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| 25 | double pre_time=currTime(); |
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| 26 | preflow_push_max_flow<ListGraph, int> max_flow_test(G, s, t, cap); |
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| 27 | max_flow_test.run(); |
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| 28 | ListGraph::NodeMap<bool> cut=max_flow_test.mincut(); |
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| 29 | int cut_value=0; |
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| 30 | for(EachEdgeIt e=G.first<EachEdgeIt>(); e.valid(); ++e) { |
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| 31 | if (cut.get(G.tail(e)) && !cut.get(G.head(e))) cut_value+=cap.get(e); |
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| 32 | } |
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| 33 | double post_time=currTime(); |
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| 34 | //std::cout << "maximum flow: "<< std::endl; |
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| 35 | //for(EachEdgeIt e=G.first<EachEdgeIt>(); e.valid(); ++e) { |
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| 36 | // std::cout<<"("<<G.tail(e)<< "-"<<flow.get(e)<<"->"<<G.head(e)<<") "; |
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| 37 | //} |
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| 38 | //std::cout<<std::endl; |
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| 39 | std::cout << "elapsed time: " << post_time-pre_time << " sec"<< std::endl; |
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| 40 | std::cout << "flow value: "<< max_flow_test.maxflow() << std::endl; |
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| 41 | std::cout << "cut value: "<< cut_value << std::endl; |
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| 42 | |
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| 43 | return 0; |
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| 44 | } |
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