1 | /* -*- C++ -*- |
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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) 2003-2006 |
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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 | #ifndef LEMON_BITS_BASE_EXTENDER_H |
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20 | #define LEMON_BITS_BASE_EXTENDER_H |
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21 | |
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22 | #include <lemon/bits/invalid.h> |
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23 | #include <lemon/error.h> |
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24 | |
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25 | #include <lemon/bits/map_extender.h> |
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26 | #include <lemon/bits/default_map.h> |
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27 | |
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28 | #include <lemon/concept_check.h> |
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29 | #include <lemon/concept/maps.h> |
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30 | |
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31 | ///\ingroup graphbits |
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32 | ///\file |
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33 | ///\brief Extenders for the graph types |
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34 | namespace lemon { |
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35 | |
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36 | /// \ingroup graphbits |
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37 | /// |
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38 | /// \brief BaseExtender for the UGraphs |
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39 | template <typename Base> |
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40 | class UndirGraphExtender : public Base { |
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41 | |
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42 | public: |
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43 | |
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44 | typedef Base Parent; |
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45 | typedef typename Parent::Edge UEdge; |
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46 | typedef typename Parent::Node Node; |
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47 | |
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48 | typedef True UndirectedTag; |
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49 | |
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50 | class Edge : public UEdge { |
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51 | friend class UndirGraphExtender; |
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52 | |
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53 | protected: |
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54 | bool forward; |
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55 | |
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56 | Edge(const UEdge &ue, bool _forward) : |
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57 | UEdge(ue), forward(_forward) {} |
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58 | |
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59 | public: |
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60 | Edge() {} |
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61 | |
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62 | /// Invalid edge constructor |
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63 | Edge(Invalid i) : UEdge(i), forward(true) {} |
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64 | |
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65 | bool operator==(const Edge &that) const { |
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66 | return forward==that.forward && UEdge(*this)==UEdge(that); |
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67 | } |
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68 | bool operator!=(const Edge &that) const { |
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69 | return forward!=that.forward || UEdge(*this)!=UEdge(that); |
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70 | } |
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71 | bool operator<(const Edge &that) const { |
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72 | return forward<that.forward || |
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73 | (!(that.forward<forward) && UEdge(*this)<UEdge(that)); |
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74 | } |
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75 | }; |
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76 | |
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77 | |
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78 | |
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79 | using Parent::source; |
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80 | |
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81 | /// Source of the given Edge. |
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82 | Node source(const Edge &e) const { |
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83 | return e.forward ? Parent::source(e) : Parent::target(e); |
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84 | } |
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85 | |
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86 | using Parent::target; |
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87 | |
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88 | /// Target of the given Edge. |
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89 | Node target(const Edge &e) const { |
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90 | return e.forward ? Parent::target(e) : Parent::source(e); |
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91 | } |
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92 | |
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93 | /// \brief Directed edge from an undirected edge. |
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94 | /// |
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95 | /// Returns a directed edge corresponding to the specified UEdge. |
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96 | /// If the given bool is true the given undirected edge and the |
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97 | /// returned edge have the same source node. |
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98 | static Edge direct(const UEdge &ue, bool d) { |
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99 | return Edge(ue, d); |
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100 | } |
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101 | |
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102 | /// Returns whether the given directed edge is same orientation as the |
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103 | /// corresponding undirected edge. |
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104 | /// |
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105 | /// \todo reference to the corresponding point of the undirected graph |
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106 | /// concept. "What does the direction of an undirected edge mean?" |
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107 | static bool direction(const Edge &e) { return e.forward; } |
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108 | |
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109 | |
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110 | using Parent::first; |
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111 | using Parent::next; |
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112 | |
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113 | void first(Edge &e) const { |
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114 | Parent::first(e); |
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115 | e.forward=true; |
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116 | } |
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117 | |
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118 | void next(Edge &e) const { |
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119 | if( e.forward ) { |
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120 | e.forward = false; |
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121 | } |
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122 | else { |
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123 | Parent::next(e); |
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124 | e.forward = true; |
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125 | } |
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126 | } |
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127 | |
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128 | void firstOut(Edge &e, const Node &n) const { |
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129 | Parent::firstIn(e,n); |
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130 | if( UEdge(e) != INVALID ) { |
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131 | e.forward = false; |
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132 | } |
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133 | else { |
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134 | Parent::firstOut(e,n); |
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135 | e.forward = true; |
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136 | } |
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137 | } |
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138 | void nextOut(Edge &e) const { |
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139 | if( ! e.forward ) { |
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140 | Node n = Parent::target(e); |
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141 | Parent::nextIn(e); |
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142 | if( UEdge(e) == INVALID ) { |
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143 | Parent::firstOut(e, n); |
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144 | e.forward = true; |
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145 | } |
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146 | } |
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147 | else { |
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148 | Parent::nextOut(e); |
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149 | } |
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150 | } |
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151 | |
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152 | void firstIn(Edge &e, const Node &n) const { |
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153 | Parent::firstOut(e,n); |
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154 | if( UEdge(e) != INVALID ) { |
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155 | e.forward = false; |
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156 | } |
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157 | else { |
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158 | Parent::firstIn(e,n); |
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159 | e.forward = true; |
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160 | } |
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161 | } |
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162 | void nextIn(Edge &e) const { |
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163 | if( ! e.forward ) { |
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164 | Node n = Parent::source(e); |
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165 | Parent::nextOut(e); |
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166 | if( UEdge(e) == INVALID ) { |
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167 | Parent::firstIn(e, n); |
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168 | e.forward = true; |
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169 | } |
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170 | } |
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171 | else { |
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172 | Parent::nextIn(e); |
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173 | } |
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174 | } |
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175 | |
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176 | void firstInc(UEdge &e, bool &d, const Node &n) const { |
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177 | d = true; |
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178 | Parent::firstOut(e, n); |
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179 | if (e != INVALID) return; |
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180 | d = false; |
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181 | Parent::firstIn(e, n); |
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182 | } |
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183 | |
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184 | void nextInc(UEdge &e, bool &d) const { |
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185 | if (d) { |
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186 | Node s = Parent::source(e); |
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187 | Parent::nextOut(e); |
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188 | if (e != INVALID) return; |
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189 | d = false; |
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190 | Parent::firstIn(e, s); |
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191 | } else { |
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192 | Parent::nextIn(e); |
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193 | } |
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194 | } |
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195 | |
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196 | Node nodeFromId(int id) const { |
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197 | return Parent::nodeFromId(id); |
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198 | } |
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199 | |
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200 | Edge edgeFromId(int id) const { |
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201 | return direct(Parent::edgeFromId(id >> 1), bool(id & 1)); |
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202 | } |
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203 | |
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204 | UEdge uEdgeFromId(int id) const { |
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205 | return Parent::edgeFromId(id); |
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206 | } |
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207 | |
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208 | int id(const Node &n) const { |
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209 | return Parent::id(n); |
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210 | } |
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211 | |
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212 | int id(const UEdge &e) const { |
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213 | return Parent::id(e); |
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214 | } |
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215 | |
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216 | int id(const Edge &e) const { |
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217 | return 2 * Parent::id(e) + int(e.forward); |
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218 | } |
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219 | |
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220 | int maxNodeId() const { |
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221 | return Parent::maxNodeId(); |
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222 | } |
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223 | |
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224 | int maxEdgeId() const { |
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225 | return 2 * Parent::maxEdgeId() + 1; |
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226 | } |
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227 | |
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228 | int maxUEdgeId() const { |
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229 | return Parent::maxEdgeId(); |
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230 | } |
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231 | |
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232 | |
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233 | int edgeNum() const { |
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234 | return 2 * Parent::edgeNum(); |
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235 | } |
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236 | |
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237 | int uEdgeNum() const { |
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238 | return Parent::edgeNum(); |
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239 | } |
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240 | |
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241 | Edge findEdge(Node source, Node target, Edge prev) const { |
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242 | if (prev == INVALID) { |
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243 | UEdge edge = Parent::findEdge(source, target); |
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244 | if (edge != INVALID) return direct(edge, true); |
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245 | edge = Parent::findEdge(target, source); |
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246 | if (edge != INVALID) return direct(edge, false); |
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247 | } else if (direction(prev)) { |
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248 | UEdge edge = Parent::findEdge(source, target, prev); |
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249 | if (edge != INVALID) return direct(edge, true); |
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250 | edge = Parent::findEdge(target, source); |
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251 | if (edge != INVALID) return direct(edge, false); |
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252 | } else { |
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253 | UEdge edge = Parent::findEdge(target, source, prev); |
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254 | if (edge != INVALID) return direct(edge, false); |
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255 | } |
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256 | return INVALID; |
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257 | } |
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258 | |
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259 | UEdge findUEdge(Node source, Node target, UEdge prev) const { |
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260 | if (prev == INVALID) { |
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261 | UEdge edge = Parent::findEdge(source, target); |
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262 | if (edge != INVALID) return edge; |
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263 | edge = Parent::findEdge(target, source); |
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264 | if (edge != INVALID) return edge; |
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265 | } else if (Parent::source(prev) == source) { |
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266 | UEdge edge = Parent::findEdge(source, target, prev); |
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267 | if (edge != INVALID) return edge; |
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268 | edge = Parent::findEdge(target, source); |
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269 | if (edge != INVALID) return edge; |
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270 | } else { |
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271 | UEdge edge = Parent::findEdge(target, source, prev); |
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272 | if (edge != INVALID) return edge; |
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273 | } |
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274 | return INVALID; |
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275 | } |
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276 | }; |
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277 | |
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278 | } |
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279 | |
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280 | #endif |
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