1 | /* -*- C++ -*- |
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2 | * test/kruskal_test.cc - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #include <iostream> |
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18 | #include <vector> |
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19 | |
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20 | #include "test_tools.h" |
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21 | #include <lemon/maps.h> |
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22 | #include <lemon/kruskal.h> |
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23 | #include <lemon/list_graph.h> |
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24 | #include <lemon/concept/maps.h> |
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25 | #include <lemon/concept/graph.h> |
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26 | |
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27 | |
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28 | using namespace std; |
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29 | using namespace lemon; |
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30 | |
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31 | void checkCompileKruskal() |
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32 | { |
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33 | concept::WriteMap<concept::StaticGraph::Edge,bool> w; |
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34 | |
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35 | kruskal(concept::StaticGraph(), |
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36 | concept::ReadMap<concept::StaticGraph::Edge,int>(), |
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37 | w); |
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38 | } |
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39 | |
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40 | int main() { |
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41 | |
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42 | typedef ListGraph::Node Node; |
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43 | typedef ListGraph::Edge Edge; |
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44 | typedef ListGraph::NodeIt NodeIt; |
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45 | typedef ListGraph::EdgeIt EdgeIt; |
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46 | |
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47 | ListGraph G; |
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48 | |
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49 | Node s=G.addNode(); |
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50 | Node v1=G.addNode(); |
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51 | Node v2=G.addNode(); |
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52 | Node v3=G.addNode(); |
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53 | Node v4=G.addNode(); |
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54 | Node t=G.addNode(); |
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55 | |
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56 | Edge e1 = G.addEdge(s, v1); |
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57 | Edge e2 = G.addEdge(s, v2); |
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58 | Edge e3 = G.addEdge(v1, v2); |
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59 | Edge e4 = G.addEdge(v2, v1); |
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60 | Edge e5 = G.addEdge(v1, v3); |
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61 | Edge e6 = G.addEdge(v3, v2); |
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62 | Edge e7 = G.addEdge(v2, v4); |
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63 | Edge e8 = G.addEdge(v4, v3); |
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64 | Edge e9 = G.addEdge(v3, t); |
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65 | Edge e10 = G.addEdge(v4, t); |
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66 | |
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67 | typedef ListGraph::EdgeMap<int> ECostMap; |
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68 | typedef ListGraph::EdgeMap<bool> EBoolMap; |
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69 | |
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70 | ECostMap edge_cost_map(G, 2); |
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71 | EBoolMap tree_map(G); |
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72 | |
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73 | |
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74 | //Test with const map. |
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75 | check(kruskal(G, ConstMap<ListGraph::Edge,int>(2), tree_map)==10, |
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76 | "Total cost should be 10"); |
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77 | //Test with a edge map (filled with uniform costs). |
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78 | check(kruskal(G, edge_cost_map, tree_map)==10, |
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79 | "Total cost should be 10"); |
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80 | |
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81 | edge_cost_map.set(e1, -10); |
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82 | edge_cost_map.set(e2, -9); |
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83 | edge_cost_map.set(e3, -8); |
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84 | edge_cost_map.set(e4, -7); |
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85 | edge_cost_map.set(e5, -6); |
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86 | edge_cost_map.set(e6, -5); |
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87 | edge_cost_map.set(e7, -4); |
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88 | edge_cost_map.set(e8, -3); |
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89 | edge_cost_map.set(e9, -2); |
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90 | edge_cost_map.set(e10, -1); |
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91 | |
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92 | vector<Edge> tree_edge_vec(5); |
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93 | |
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94 | //Test with a edge map and inserter. |
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95 | check(kruskal(G, edge_cost_map, |
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96 | tree_edge_vec.begin()) |
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97 | ==-31, |
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98 | "Total cost should be -31."); |
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99 | |
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100 | tree_edge_vec.clear(); |
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101 | |
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102 | check(kruskal(G, edge_cost_map, |
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103 | back_inserter(tree_edge_vec)) |
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104 | ==-31, |
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105 | "Total cost should be -31."); |
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106 | |
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107 | tree_edge_vec.clear(); |
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108 | |
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109 | //The above test could also be coded like this: |
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110 | check(kruskal(G, |
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111 | makeKruskalMapInput(G, edge_cost_map), |
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112 | makeKruskalSequenceOutput(back_inserter(tree_edge_vec))) |
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113 | ==-31, |
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114 | "Total cost should be -31."); |
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115 | |
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116 | check(tree_edge_vec.size()==5,"The tree should have 5 edges."); |
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117 | |
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118 | check(tree_edge_vec[0]==e1 && |
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119 | tree_edge_vec[1]==e2 && |
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120 | tree_edge_vec[2]==e5 && |
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121 | tree_edge_vec[3]==e7 && |
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122 | tree_edge_vec[4]==e9, |
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123 | "Wrong tree."); |
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124 | |
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125 | return 0; |
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126 | } |
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