1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library. |
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4 | * |
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5 | * Copyright (C) 2003-2009 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #include <lemon/euler.h> |
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20 | #include <lemon/list_graph.h> |
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21 | #include <test/test_tools.h> |
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22 | |
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23 | using namespace lemon; |
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24 | |
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25 | template <typename Digraph> |
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26 | void checkDiEulerIt(const Digraph& g) |
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27 | { |
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28 | typename Digraph::template ArcMap<int> visitationNumber(g); |
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29 | |
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30 | DiEulerIt<Digraph> e(g); |
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31 | typename Digraph::Node firstNode = g.source(e); |
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32 | typename Digraph::Node lastNode; |
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33 | |
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34 | for (; e != INVALID; ++e) |
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35 | { |
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36 | if (e != INVALID) |
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37 | { |
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38 | lastNode = g.target(e); |
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39 | } |
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40 | ++visitationNumber[e]; |
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41 | } |
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42 | |
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43 | check(firstNode == lastNode, |
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44 | "checkDiEulerIt: first and last node are not the same"); |
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45 | |
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46 | for (typename Digraph::ArcIt a(g); a != INVALID; ++a) |
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47 | { |
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48 | check(visitationNumber[a] == 1, |
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49 | "checkDiEulerIt: not visited or multiple times visited arc found"); |
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50 | } |
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51 | } |
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52 | |
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53 | template <typename Graph> |
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54 | void checkEulerIt(const Graph& g) |
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55 | { |
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56 | typename Graph::template EdgeMap<int> visitationNumber(g); |
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57 | |
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58 | EulerIt<Graph> e(g); |
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59 | typename Graph::Node firstNode = g.u(e); |
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60 | typename Graph::Node lastNode; |
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61 | |
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62 | for (; e != INVALID; ++e) |
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63 | { |
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64 | if (e != INVALID) |
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65 | { |
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66 | lastNode = g.v(e); |
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67 | } |
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68 | ++visitationNumber[e]; |
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69 | } |
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70 | |
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71 | check(firstNode == lastNode, |
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72 | "checkEulerIt: first and last node are not the same"); |
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73 | |
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74 | for (typename Graph::EdgeIt e(g); e != INVALID; ++e) |
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75 | { |
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76 | check(visitationNumber[e] == 1, |
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77 | "checkEulerIt: not visited or multiple times visited edge found"); |
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78 | } |
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79 | } |
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80 | |
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81 | int main() |
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82 | { |
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83 | typedef ListDigraph Digraph; |
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84 | typedef ListGraph Graph; |
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85 | |
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86 | Digraph digraphWithEulerianCircuit; |
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87 | { |
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88 | Digraph& g = digraphWithEulerianCircuit; |
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89 | |
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90 | Digraph::Node n0 = g.addNode(); |
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91 | Digraph::Node n1 = g.addNode(); |
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92 | Digraph::Node n2 = g.addNode(); |
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93 | |
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94 | g.addArc(n0, n1); |
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95 | g.addArc(n1, n0); |
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96 | g.addArc(n1, n2); |
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97 | g.addArc(n2, n1); |
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98 | } |
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99 | |
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100 | Digraph digraphWithoutEulerianCircuit; |
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101 | { |
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102 | Digraph& g = digraphWithoutEulerianCircuit; |
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103 | |
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104 | Digraph::Node n0 = g.addNode(); |
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105 | Digraph::Node n1 = g.addNode(); |
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106 | Digraph::Node n2 = g.addNode(); |
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107 | |
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108 | g.addArc(n0, n1); |
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109 | g.addArc(n1, n0); |
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110 | g.addArc(n1, n2); |
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111 | } |
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112 | |
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113 | Graph graphWithEulerianCircuit; |
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114 | { |
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115 | Graph& g = graphWithEulerianCircuit; |
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116 | |
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117 | Graph::Node n0 = g.addNode(); |
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118 | Graph::Node n1 = g.addNode(); |
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119 | Graph::Node n2 = g.addNode(); |
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120 | |
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121 | g.addEdge(n0, n1); |
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122 | g.addEdge(n1, n2); |
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123 | g.addEdge(n2, n0); |
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124 | } |
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125 | |
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126 | Graph graphWithoutEulerianCircuit; |
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127 | { |
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128 | Graph& g = graphWithoutEulerianCircuit; |
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129 | |
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130 | Graph::Node n0 = g.addNode(); |
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131 | Graph::Node n1 = g.addNode(); |
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132 | Graph::Node n2 = g.addNode(); |
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133 | |
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134 | g.addEdge(n0, n1); |
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135 | g.addEdge(n1, n2); |
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136 | } |
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137 | |
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138 | checkDiEulerIt(digraphWithEulerianCircuit); |
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139 | |
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140 | checkEulerIt(graphWithEulerianCircuit); |
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141 | |
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142 | check(eulerian(digraphWithEulerianCircuit), |
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143 | "this graph should have an Eulerian circuit"); |
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144 | check(!eulerian(digraphWithoutEulerianCircuit), |
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145 | "this graph should not have an Eulerian circuit"); |
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146 | |
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147 | check(eulerian(graphWithEulerianCircuit), |
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148 | "this graph should have an Eulerian circuit"); |
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149 | check(!eulerian(graphWithoutEulerianCircuit), |
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150 | "this graph should have an Eulerian circuit"); |
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151 | |
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152 | return 0; |
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153 | } |
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