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) 2003-2011 |
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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 <lemon/adaptors.h> |
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22 | #include "test_tools.h" |
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23 | |
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24 | using namespace lemon; |
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25 | |
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26 | template <typename Digraph> |
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27 | void checkDiEulerIt(const Digraph& g, |
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28 | const typename Digraph::Node& start = INVALID) |
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29 | { |
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30 | typename Digraph::template ArcMap<int> visitationNumber(g, 0); |
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31 | |
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32 | DiEulerIt<Digraph> e(g, start); |
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33 | if (e == INVALID) return; |
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34 | typename Digraph::Node firstNode = g.source(e); |
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35 | typename Digraph::Node lastNode = g.target(e); |
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36 | if (start != INVALID) { |
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37 | check(firstNode == start, "checkDiEulerIt: Wrong first node"); |
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38 | } |
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39 | |
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40 | for (; e != INVALID; ++e) { |
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41 | if (e != INVALID) lastNode = g.target(e); |
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42 | ++visitationNumber[e]; |
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43 | } |
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44 | |
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45 | check(firstNode == lastNode, |
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46 | "checkDiEulerIt: First and last nodes are not the same"); |
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47 | |
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48 | for (typename Digraph::ArcIt a(g); a != INVALID; ++a) |
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49 | { |
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50 | check(visitationNumber[a] == 1, |
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51 | "checkDiEulerIt: Not visited or multiple times visited arc found"); |
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52 | } |
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53 | } |
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54 | |
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55 | template <typename Graph> |
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56 | void checkEulerIt(const Graph& g, |
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57 | const typename Graph::Node& start = INVALID) |
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58 | { |
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59 | typename Graph::template EdgeMap<int> visitationNumber(g, 0); |
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60 | |
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61 | EulerIt<Graph> e(g, start); |
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62 | if (e == INVALID) return; |
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63 | typename Graph::Node firstNode = g.source(typename Graph::Arc(e)); |
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64 | typename Graph::Node lastNode = g.target(typename Graph::Arc(e)); |
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65 | if (start != INVALID) { |
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66 | check(firstNode == start, "checkEulerIt: Wrong first node"); |
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67 | } |
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68 | |
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69 | for (; e != INVALID; ++e) { |
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70 | if (e != INVALID) lastNode = g.target(typename Graph::Arc(e)); |
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71 | ++visitationNumber[e]; |
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72 | } |
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73 | |
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74 | check(firstNode == lastNode, |
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75 | "checkEulerIt: First and last nodes are not the same"); |
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76 | |
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77 | for (typename Graph::EdgeIt e(g); e != INVALID; ++e) |
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78 | { |
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79 | check(visitationNumber[e] == 1, |
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80 | "checkEulerIt: Not visited or multiple times visited edge found"); |
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81 | } |
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82 | } |
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83 | |
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84 | int main() |
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85 | { |
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86 | typedef ListDigraph Digraph; |
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87 | typedef Undirector<Digraph> Graph; |
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88 | |
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89 | { |
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90 | Digraph d; |
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91 | Graph g(d); |
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92 | |
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93 | checkDiEulerIt(d); |
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94 | checkDiEulerIt(g); |
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95 | checkEulerIt(g); |
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96 | |
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97 | check(eulerian(d), "This graph is Eulerian"); |
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98 | check(eulerian(g), "This graph is Eulerian"); |
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99 | } |
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100 | { |
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101 | Digraph d; |
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102 | Graph g(d); |
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103 | Digraph::Node n = d.addNode(); |
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104 | ::lemon::ignore_unused_variable_warning(n); |
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105 | |
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106 | checkDiEulerIt(d); |
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107 | checkDiEulerIt(g); |
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108 | checkEulerIt(g); |
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109 | |
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110 | check(eulerian(d), "This graph is Eulerian"); |
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111 | check(eulerian(g), "This graph is Eulerian"); |
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112 | } |
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113 | { |
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114 | Digraph d; |
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115 | Graph g(d); |
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116 | Digraph::Node n = d.addNode(); |
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117 | d.addArc(n, n); |
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118 | |
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119 | checkDiEulerIt(d); |
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120 | checkDiEulerIt(g); |
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121 | checkEulerIt(g); |
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122 | |
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123 | check(eulerian(d), "This graph is Eulerian"); |
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124 | check(eulerian(g), "This graph is Eulerian"); |
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125 | } |
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126 | { |
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127 | Digraph d; |
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128 | Graph g(d); |
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129 | Digraph::Node n1 = d.addNode(); |
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130 | Digraph::Node n2 = d.addNode(); |
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131 | Digraph::Node n3 = d.addNode(); |
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132 | |
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133 | d.addArc(n1, n2); |
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134 | d.addArc(n2, n1); |
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135 | d.addArc(n2, n3); |
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136 | d.addArc(n3, n2); |
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137 | |
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138 | checkDiEulerIt(d); |
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139 | checkDiEulerIt(d, n2); |
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140 | checkDiEulerIt(g); |
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141 | checkDiEulerIt(g, n2); |
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142 | checkEulerIt(g); |
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143 | checkEulerIt(g, n2); |
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144 | |
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145 | check(eulerian(d), "This graph is Eulerian"); |
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146 | check(eulerian(g), "This graph is Eulerian"); |
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147 | } |
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148 | { |
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149 | Digraph d; |
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150 | Graph g(d); |
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151 | Digraph::Node n1 = d.addNode(); |
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152 | Digraph::Node n2 = d.addNode(); |
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153 | Digraph::Node n3 = d.addNode(); |
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154 | Digraph::Node n4 = d.addNode(); |
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155 | Digraph::Node n5 = d.addNode(); |
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156 | Digraph::Node n6 = d.addNode(); |
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157 | |
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158 | d.addArc(n1, n2); |
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159 | d.addArc(n2, n4); |
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160 | d.addArc(n1, n3); |
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161 | d.addArc(n3, n4); |
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162 | d.addArc(n4, n1); |
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163 | d.addArc(n3, n5); |
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164 | d.addArc(n5, n2); |
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165 | d.addArc(n4, n6); |
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166 | d.addArc(n2, n6); |
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167 | d.addArc(n6, n1); |
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168 | d.addArc(n6, n3); |
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169 | |
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170 | checkDiEulerIt(d); |
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171 | checkDiEulerIt(d, n1); |
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172 | checkDiEulerIt(d, n5); |
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173 | |
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174 | checkDiEulerIt(g); |
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175 | checkDiEulerIt(g, n1); |
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176 | checkDiEulerIt(g, n5); |
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177 | checkEulerIt(g); |
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178 | checkEulerIt(g, n1); |
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179 | checkEulerIt(g, n5); |
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180 | |
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181 | check(eulerian(d), "This graph is Eulerian"); |
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182 | check(eulerian(g), "This graph is Eulerian"); |
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183 | } |
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184 | { |
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185 | Digraph d; |
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186 | Graph g(d); |
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187 | Digraph::Node n0 = d.addNode(); |
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188 | Digraph::Node n1 = d.addNode(); |
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189 | Digraph::Node n2 = d.addNode(); |
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190 | Digraph::Node n3 = d.addNode(); |
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191 | Digraph::Node n4 = d.addNode(); |
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192 | Digraph::Node n5 = d.addNode(); |
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193 | ::lemon::ignore_unused_variable_warning(n0,n4,n5); |
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194 | |
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195 | d.addArc(n1, n2); |
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196 | d.addArc(n2, n3); |
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197 | d.addArc(n3, n1); |
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198 | |
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199 | checkDiEulerIt(d); |
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200 | checkDiEulerIt(d, n2); |
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201 | |
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202 | checkDiEulerIt(g); |
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203 | checkDiEulerIt(g, n2); |
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204 | checkEulerIt(g); |
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205 | checkEulerIt(g, n2); |
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206 | |
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207 | check(!eulerian(d), "This graph is not Eulerian"); |
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208 | check(!eulerian(g), "This graph is not Eulerian"); |
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209 | } |
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210 | { |
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211 | Digraph d; |
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212 | Graph g(d); |
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213 | Digraph::Node n1 = d.addNode(); |
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214 | Digraph::Node n2 = d.addNode(); |
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215 | Digraph::Node n3 = d.addNode(); |
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216 | |
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217 | d.addArc(n1, n2); |
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218 | d.addArc(n2, n3); |
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219 | |
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220 | check(!eulerian(d), "This graph is not Eulerian"); |
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221 | check(!eulerian(g), "This graph is not Eulerian"); |
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222 | } |
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223 | |
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224 | return 0; |
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225 | } |
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