1 | #include <iostream> |
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2 | |
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3 | #include "test_tools.h" |
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4 | #include <lemon/smart_graph.h> |
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5 | #include <lemon/lgf_reader.h> |
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6 | #include <lemon/gomory_hu.h> |
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7 | #include <cstdlib> |
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8 | |
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9 | using namespace std; |
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10 | using namespace lemon; |
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11 | |
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12 | typedef SmartGraph Graph; |
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13 | |
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14 | char test_lgf[] = |
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15 | "@nodes\n" |
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16 | "label\n" |
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17 | "0\n" |
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18 | "1\n" |
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19 | "2\n" |
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20 | "3\n" |
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21 | "4\n" |
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22 | "@arcs\n" |
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23 | " label capacity\n" |
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24 | "0 1 0 1\n" |
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25 | "1 2 1 1\n" |
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26 | "2 3 2 1\n" |
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27 | "0 3 4 5\n" |
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28 | "0 3 5 10\n" |
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29 | "0 3 6 7\n" |
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30 | "4 2 7 1\n" |
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31 | "@attributes\n" |
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32 | "source 0\n" |
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33 | "target 3\n"; |
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34 | |
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35 | GRAPH_TYPEDEFS(Graph); |
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36 | typedef Graph::EdgeMap<int> IntEdgeMap; |
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37 | typedef Graph::NodeMap<bool> BoolNodeMap; |
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38 | |
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39 | int cutValue(const Graph& graph, const BoolNodeMap& cut, |
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40 | const IntEdgeMap& capacity) { |
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41 | |
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42 | int sum = 0; |
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43 | for (EdgeIt e(graph); e != INVALID; ++e) { |
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44 | Node s = graph.u(e); |
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45 | Node t = graph.v(e); |
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46 | |
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47 | if (cut[s] != cut[t]) { |
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48 | sum += capacity[e]; |
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49 | } |
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50 | } |
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51 | return sum; |
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52 | } |
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53 | |
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54 | |
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55 | int main() { |
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56 | Graph graph; |
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57 | IntEdgeMap capacity(graph); |
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58 | |
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59 | std::istringstream input(test_lgf); |
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60 | GraphReader<Graph>(graph, input). |
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61 | edgeMap("capacity", capacity).run(); |
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62 | |
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63 | GomoryHu<Graph> ght(graph, capacity); |
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64 | ght.run(); |
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65 | |
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66 | for (NodeIt u(graph); u != INVALID; ++u) { |
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67 | for (NodeIt v(graph); v != u; ++v) { |
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68 | Preflow<Graph, IntEdgeMap> pf(graph, capacity, u, v); |
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69 | pf.runMinCut(); |
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70 | BoolNodeMap cm(graph); |
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71 | ght.minCutMap(u, v, cm); |
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72 | check(pf.flowValue() == ght.minCutValue(u, v), "Wrong cut 1"); |
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73 | check(cm[u] != cm[v], "Wrong cut 3"); |
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74 | check(pf.flowValue() == cutValue(graph, cm, capacity), "Wrong cut 2"); |
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75 | |
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76 | int sum=0; |
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77 | for(GomoryHu<Graph>::MinCutEdgeIt a(ght, u, v);a!=INVALID;++a) |
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78 | sum+=capacity[a]; |
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79 | check(sum == ght.minCutValue(u, v), "Problem with MinCutEdgeIt"); |
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80 | |
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81 | sum=0; |
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82 | for(GomoryHu<Graph>::MinCutNodeIt n(ght, u, v,true);n!=INVALID;++n) |
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83 | sum++; |
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84 | for(GomoryHu<Graph>::MinCutNodeIt n(ght, u, v,false);n!=INVALID;++n) |
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85 | sum++; |
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86 | check(sum == countNodes(graph), "Problem with MinCutNodeIt"); |
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87 | |
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88 | } |
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89 | } |
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90 | |
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91 | return 0; |
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92 | } |
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