1 | #include <iostream> |
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2 | #include <string> |
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3 | |
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4 | #include <boost/config.hpp> |
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5 | #include <boost/graph/push_relabel_max_flow.hpp> |
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6 | #include <boost/graph/adjacency_list.hpp> |
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7 | #include <boost/graph/read_dimacs.hpp> |
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8 | #include <boost/graph/graph_utility.hpp> |
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9 | |
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10 | #include <time_measure.h> |
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11 | |
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12 | // Use a DIMACS network flow file as stdin. |
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13 | // max_flow < max_flow.dat |
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14 | int main() |
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15 | { |
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16 | using namespace boost; |
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17 | |
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18 | typedef adjacency_list_traits<vecS, vecS, directedS> Traits; |
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19 | typedef adjacency_list<listS, vecS, directedS, |
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20 | property<vertex_name_t, std::string>, |
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21 | property<edge_capacity_t, long, |
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22 | property<edge_residual_capacity_t, long, |
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23 | property<edge_reverse_t, Traits::edge_descriptor> > > |
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24 | > Graph; |
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25 | |
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26 | Graph g; |
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27 | |
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28 | property_map<Graph, edge_capacity_t>::type |
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29 | capacity = get(edge_capacity, g); |
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30 | property_map<Graph, edge_reverse_t>::type |
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31 | rev = get(edge_reverse, g); |
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32 | property_map<Graph, edge_residual_capacity_t>::type |
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33 | residual_capacity = get(edge_residual_capacity, g); |
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34 | |
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35 | Traits::vertex_descriptor s, t; |
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36 | read_dimacs_max_flow(g, capacity, rev, s, t); |
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37 | |
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38 | std::cout << "preflow demo (BOOST)..." << endl; |
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39 | double pre_time=currTime(); |
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40 | long flow = push_relabel_max_flow(g, s, t); |
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41 | double post_time=currTime(); |
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42 | |
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43 | //std::cout << "maximum flow: " << std::endl; |
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44 | //graph_traits<Graph>::vertex_iterator u_iter, u_end; |
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45 | //graph_traits<Graph>::out_edge_iterator ei, e_end; |
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46 | //for (tie(u_iter, u_end) = vertices(g); u_iter != u_end; ++u_iter) |
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47 | // for (tie(ei, e_end) = out_edges(*u_iter, g); ei != e_end; ++ei) |
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48 | // if (capacity[*ei] > 0) |
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49 | // std::cout << "f " << *u_iter << " " << target(*ei, g) << " " |
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50 | // << (capacity[*ei] - residual_capacity[*ei]) << std::endl; |
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51 | // |
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52 | //std::cout << std::endl; |
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53 | std::cout << "elapsed time: " << post_time-pre_time << " sec"<< std::endl; |
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54 | std::cout << "flow value: " << flow << std::endl; |
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55 | |
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56 | return 0; |
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57 | } |
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