1 | // -*- c++ -*- |
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2 | #include <iostream> |
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3 | #include <fstream> |
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4 | |
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5 | #include <list_graph.h> |
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6 | //#include <smart_graph.h> |
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7 | #include <hugo/dimacs.h> |
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8 | #include <hugo/time_measure.h> |
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9 | #include <for_each_macros.h> |
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10 | #include <bfs_iterator.h> |
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11 | |
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12 | using namespace hugo; |
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13 | |
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14 | int main() { |
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15 | typedef ListGraph Graph; |
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16 | typedef Graph::Node Node; |
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17 | typedef Graph::NodeIt NodeIt; |
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18 | typedef Graph::Edge Edge; |
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19 | typedef Graph::EdgeIt EdgeIt; |
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20 | typedef Graph::OutEdgeIt OutEdgeIt; |
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21 | |
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22 | Graph G; |
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23 | Node s, t; |
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24 | Graph::EdgeMap<int> cap(G); |
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25 | readDimacsMaxFlow(std::cin, G, s, t, cap); |
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26 | Graph::NodeMap<OutEdgeIt> pred(G); |
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27 | Timer ts; |
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28 | { |
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29 | ts.reset(); |
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30 | Graph::NodeMap<bool> reached(G); |
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31 | reached.set(s, true); |
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32 | pred.set(s, INVALID); |
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33 | std::queue<Node> bfs_queue; |
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34 | bfs_queue.push(t); |
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35 | while (!bfs_queue.empty()) { |
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36 | Node v=bfs_queue.front(); |
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37 | bfs_queue.pop(); |
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38 | OutEdgeIt e; |
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39 | for(G.first(e,v); G.valid(e); G.next(e)) { |
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40 | Node w=G.head(e); |
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41 | if (!reached[w]) { |
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42 | bfs_queue.push(w); |
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43 | reached.set(w, true); |
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44 | pred.set(w, e); |
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45 | } |
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46 | } |
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47 | } |
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48 | |
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49 | std::cout << ts << std::endl; |
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50 | } |
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51 | |
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52 | { |
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53 | ts.reset(); |
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54 | BfsIterator< Graph, Graph::NodeMap<bool> > bfs(G); |
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55 | bfs.pushAndSetReached(s); |
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56 | pred.set(s, INVALID); |
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57 | while (!bfs.finished()) { |
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58 | ++bfs; |
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59 | if (G.valid(bfs) && bfs.isBNodeNewlyReached()) |
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60 | pred.set(bfs.bNode(), bfs); |
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61 | } |
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62 | std::cout << ts << std::endl; |
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63 | } |
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64 | |
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65 | return 0; |
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66 | } |
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