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) 2003-2008 |
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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_SMART_GRAPH_H |
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20 | #define LEMON_SMART_GRAPH_H |
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21 | |
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22 | ///\ingroup graphs |
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23 | ///\file |
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24 | ///\brief SmartGraph and SmartUGraph classes. |
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25 | |
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26 | #include <vector> |
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27 | |
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28 | #include <lemon/bits/invalid.h> |
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29 | |
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30 | #include <lemon/bits/base_extender.h> |
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31 | #include <lemon/bits/graph_extender.h> |
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32 | |
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33 | #include <lemon/bits/utility.h> |
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34 | #include <lemon/error.h> |
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35 | |
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36 | #include <lemon/bits/graph_extender.h> |
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37 | |
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38 | namespace lemon { |
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39 | |
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40 | class SmartGraph; |
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41 | ///Base of SmartGraph |
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42 | |
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43 | ///Base of SmartGraph |
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44 | /// |
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45 | class SmartGraphBase { |
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46 | protected: |
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47 | |
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48 | struct NodeT |
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49 | { |
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50 | int first_in, first_out; |
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51 | NodeT() {} |
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52 | }; |
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53 | struct EdgeT |
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54 | { |
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55 | int target, source, next_in, next_out; |
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56 | EdgeT() {} |
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57 | }; |
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58 | |
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59 | std::vector<NodeT> nodes; |
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60 | |
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61 | std::vector<EdgeT> edges; |
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62 | |
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63 | |
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64 | public: |
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65 | |
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66 | typedef SmartGraphBase Graph; |
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67 | |
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68 | class Node; |
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69 | class Edge; |
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70 | |
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71 | |
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72 | public: |
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73 | |
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74 | SmartGraphBase() : nodes(), edges() { } |
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75 | SmartGraphBase(const SmartGraphBase &_g) |
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76 | : nodes(_g.nodes), edges(_g.edges) { } |
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77 | |
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78 | typedef True NodeNumTag; |
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79 | typedef True EdgeNumTag; |
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80 | |
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81 | int nodeNum() const { return nodes.size(); } |
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82 | int edgeNum() const { return edges.size(); } |
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83 | |
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84 | int maxNodeId() const { return nodes.size()-1; } |
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85 | int maxEdgeId() const { return edges.size()-1; } |
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86 | |
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87 | Node addNode() { |
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88 | int n = nodes.size(); |
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89 | nodes.push_back(NodeT()); |
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90 | nodes[n].first_in = -1; |
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91 | nodes[n].first_out = -1; |
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92 | return Node(n); |
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93 | } |
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94 | |
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95 | Edge addEdge(Node u, Node v) { |
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96 | int n = edges.size(); |
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97 | edges.push_back(EdgeT()); |
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98 | edges[n].source = u.id; |
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99 | edges[n].target = v.id; |
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100 | edges[n].next_out = nodes[u.id].first_out; |
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101 | edges[n].next_in = nodes[v.id].first_in; |
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102 | nodes[u.id].first_out = nodes[v.id].first_in = n; |
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103 | |
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104 | return Edge(n); |
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105 | } |
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106 | |
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107 | void clear() { |
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108 | edges.clear(); |
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109 | nodes.clear(); |
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110 | } |
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111 | |
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112 | Node source(Edge e) const { return Node(edges[e.id].source); } |
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113 | Node target(Edge e) const { return Node(edges[e.id].target); } |
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114 | |
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115 | static int id(Node v) { return v.id; } |
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116 | static int id(Edge e) { return e.id; } |
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117 | |
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118 | static Node nodeFromId(int id) { return Node(id);} |
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119 | static Edge edgeFromId(int id) { return Edge(id);} |
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120 | |
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121 | class Node { |
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122 | friend class SmartGraphBase; |
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123 | friend class SmartGraph; |
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124 | |
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125 | protected: |
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126 | int id; |
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127 | explicit Node(int _id) : id(_id) {} |
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128 | public: |
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129 | Node() {} |
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130 | Node (Invalid) : id(-1) {} |
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131 | bool operator==(const Node i) const {return id == i.id;} |
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132 | bool operator!=(const Node i) const {return id != i.id;} |
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133 | bool operator<(const Node i) const {return id < i.id;} |
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134 | }; |
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135 | |
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136 | |
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137 | class Edge { |
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138 | friend class SmartGraphBase; |
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139 | friend class SmartGraph; |
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140 | |
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141 | protected: |
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142 | int id; |
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143 | explicit Edge(int _id) : id(_id) {} |
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144 | public: |
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145 | Edge() { } |
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146 | Edge (Invalid) : id(-1) {} |
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147 | bool operator==(const Edge i) const {return id == i.id;} |
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148 | bool operator!=(const Edge i) const {return id != i.id;} |
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149 | bool operator<(const Edge i) const {return id < i.id;} |
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150 | }; |
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151 | |
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152 | void first(Node& node) const { |
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153 | node.id = nodes.size() - 1; |
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154 | } |
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155 | |
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156 | static void next(Node& node) { |
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157 | --node.id; |
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158 | } |
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159 | |
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160 | void first(Edge& edge) const { |
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161 | edge.id = edges.size() - 1; |
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162 | } |
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163 | |
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164 | static void next(Edge& edge) { |
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165 | --edge.id; |
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166 | } |
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167 | |
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168 | void firstOut(Edge& edge, const Node& node) const { |
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169 | edge.id = nodes[node.id].first_out; |
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170 | } |
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171 | |
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172 | void nextOut(Edge& edge) const { |
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173 | edge.id = edges[edge.id].next_out; |
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174 | } |
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175 | |
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176 | void firstIn(Edge& edge, const Node& node) const { |
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177 | edge.id = nodes[node.id].first_in; |
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178 | } |
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179 | |
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180 | void nextIn(Edge& edge) const { |
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181 | edge.id = edges[edge.id].next_in; |
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182 | } |
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183 | |
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184 | }; |
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185 | |
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186 | typedef GraphExtender<SmartGraphBase> ExtendedSmartGraphBase; |
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187 | |
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188 | ///\ingroup graphs |
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189 | /// |
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190 | ///\brief A smart graph class. |
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191 | /// |
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192 | ///This is a simple and fast graph implementation. |
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193 | ///It is also quite memory efficient, but at the price |
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194 | ///that <b> it does support only limited (only stack-like) |
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195 | ///node and edge deletions</b>. |
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196 | ///It conforms to |
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197 | ///the \ref concepts::Graph "Graph concept" with an |
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198 | ///important extra feature that |
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199 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
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200 | /// |
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201 | ///\sa concepts::Graph. |
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202 | /// |
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203 | ///\author Alpar Juttner |
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204 | class SmartGraph : public ExtendedSmartGraphBase { |
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205 | public: |
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206 | |
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207 | typedef ExtendedSmartGraphBase Parent; |
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208 | |
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209 | private: |
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210 | |
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211 | ///SmartGraph is \e not copy constructible. Use GraphCopy() instead. |
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212 | |
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213 | ///SmartGraph is \e not copy constructible. Use GraphCopy() instead. |
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214 | /// |
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215 | SmartGraph(const SmartGraph &) : ExtendedSmartGraphBase() {}; |
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216 | ///\brief Assignment of SmartGraph to another one is \e not allowed. |
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217 | ///Use GraphCopy() instead. |
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218 | |
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219 | ///Assignment of SmartGraph to another one is \e not allowed. |
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220 | ///Use GraphCopy() instead. |
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221 | void operator=(const SmartGraph &) {} |
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222 | |
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223 | public: |
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224 | |
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225 | /// Constructor |
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226 | |
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227 | /// Constructor. |
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228 | /// |
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229 | SmartGraph() {}; |
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230 | |
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231 | ///Add a new node to the graph. |
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232 | |
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233 | /// \return the new node. |
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234 | /// |
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235 | Node addNode() { return Parent::addNode(); } |
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236 | |
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237 | ///Add a new edge to the graph. |
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238 | |
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239 | ///Add a new edge to the graph with source node \c s |
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240 | ///and target node \c t. |
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241 | ///\return the new edge. |
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242 | Edge addEdge(const Node& s, const Node& t) { |
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243 | return Parent::addEdge(s, t); |
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244 | } |
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245 | |
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246 | /// \brief Using this it is possible to avoid the superfluous memory |
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247 | /// allocation. |
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248 | |
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249 | /// Using this it is possible to avoid the superfluous memory |
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250 | /// allocation: if you know that the graph you want to build will |
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251 | /// be very large (e.g. it will contain millions of nodes and/or edges) |
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252 | /// then it is worth reserving space for this amount before starting |
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253 | /// to build the graph. |
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254 | /// \sa reserveEdge |
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255 | void reserveNode(int n) { nodes.reserve(n); }; |
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256 | |
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257 | /// \brief Using this it is possible to avoid the superfluous memory |
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258 | /// allocation. |
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259 | |
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260 | /// Using this it is possible to avoid the superfluous memory |
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261 | /// allocation: if you know that the graph you want to build will |
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262 | /// be very large (e.g. it will contain millions of nodes and/or edges) |
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263 | /// then it is worth reserving space for this amount before starting |
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264 | /// to build the graph. |
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265 | /// \sa reserveNode |
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266 | void reserveEdge(int m) { edges.reserve(m); }; |
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267 | |
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268 | ///Clear the graph. |
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269 | |
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270 | ///Erase all the nodes and edges from the graph. |
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271 | /// |
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272 | void clear() { |
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273 | Parent::clear(); |
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274 | } |
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275 | |
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276 | ///Split a node. |
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277 | |
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278 | ///This function splits a node. First a new node is added to the graph, |
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279 | ///then the source of each outgoing edge of \c n is moved to this new node. |
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280 | ///If \c connect is \c true (this is the default value), then a new edge |
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281 | ///from \c n to the newly created node is also added. |
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282 | ///\return The newly created node. |
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283 | /// |
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284 | ///\note The <tt>Edge</tt>s |
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285 | ///referencing a moved edge remain |
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286 | ///valid. However <tt>InEdge</tt>'s and <tt>OutEdge</tt>'s |
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287 | ///may be invalidated. |
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288 | ///\warning This functionality cannot be used together with the Snapshot |
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289 | ///feature. |
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290 | ///\todo It could be implemented in a bit faster way. |
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291 | Node split(Node n, bool connect = true) |
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292 | { |
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293 | Node b = addNode(); |
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294 | nodes[b.id].first_out=nodes[n.id].first_out; |
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295 | nodes[n.id].first_out=-1; |
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296 | for(int i=nodes[b.id].first_out;i!=-1;i++) edges[i].source=b.id; |
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297 | if(connect) addEdge(n,b); |
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298 | return b; |
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299 | } |
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300 | |
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301 | public: |
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302 | |
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303 | class Snapshot; |
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304 | |
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305 | protected: |
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306 | |
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307 | void restoreSnapshot(const Snapshot &s) |
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308 | { |
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309 | while(s.edge_num<edges.size()) { |
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310 | Edge edge = edgeFromId(edges.size()-1); |
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311 | Parent::notifier(Edge()).erase(edge); |
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312 | nodes[edges.back().source].first_out=edges.back().next_out; |
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313 | nodes[edges.back().target].first_in=edges.back().next_in; |
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314 | edges.pop_back(); |
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315 | } |
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316 | while(s.node_num<nodes.size()) { |
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317 | Node node = nodeFromId(nodes.size()-1); |
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318 | Parent::notifier(Node()).erase(node); |
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319 | nodes.pop_back(); |
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320 | } |
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321 | } |
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322 | |
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323 | public: |
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324 | |
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325 | ///Class to make a snapshot of the graph and to restrore to it later. |
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326 | |
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327 | ///Class to make a snapshot of the graph and to restrore to it later. |
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328 | /// |
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329 | ///The newly added nodes and edges can be removed using the |
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330 | ///restore() function. |
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331 | ///\note After you restore a state, you cannot restore |
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332 | ///a later state, in other word you cannot add again the edges deleted |
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333 | ///by restore() using another one Snapshot instance. |
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334 | /// |
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335 | ///\warning If you do not use correctly the snapshot that can cause |
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336 | ///either broken program, invalid state of the graph, valid but |
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337 | ///not the restored graph or no change. Because the runtime performance |
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338 | ///the validity of the snapshot is not stored. |
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339 | class Snapshot |
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340 | { |
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341 | SmartGraph *g; |
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342 | protected: |
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343 | friend class SmartGraph; |
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344 | unsigned int node_num; |
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345 | unsigned int edge_num; |
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346 | public: |
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347 | ///Default constructor. |
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348 | |
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349 | ///Default constructor. |
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350 | ///To actually make a snapshot you must call save(). |
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351 | /// |
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352 | Snapshot() : g(0) {} |
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353 | ///Constructor that immediately makes a snapshot |
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354 | |
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355 | ///This constructor immediately makes a snapshot of the graph. |
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356 | ///\param _g The graph we make a snapshot of. |
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357 | Snapshot(SmartGraph &_g) :g(&_g) { |
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358 | node_num=g->nodes.size(); |
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359 | edge_num=g->edges.size(); |
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360 | } |
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361 | |
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362 | ///Make a snapshot. |
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363 | |
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364 | ///Make a snapshot of the graph. |
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365 | /// |
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366 | ///This function can be called more than once. In case of a repeated |
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367 | ///call, the previous snapshot gets lost. |
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368 | ///\param _g The graph we make the snapshot of. |
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369 | void save(SmartGraph &_g) |
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370 | { |
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371 | g=&_g; |
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372 | node_num=g->nodes.size(); |
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373 | edge_num=g->edges.size(); |
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374 | } |
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375 | |
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376 | ///Undo the changes until a snapshot. |
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377 | |
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378 | ///Undo the changes until a snapshot created by save(). |
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379 | /// |
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380 | ///\note After you restored a state, you cannot restore |
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381 | ///a later state, in other word you cannot add again the edges deleted |
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382 | ///by restore(). |
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383 | void restore() |
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384 | { |
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385 | g->restoreSnapshot(*this); |
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386 | } |
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387 | }; |
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388 | }; |
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389 | |
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390 | |
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391 | class SmartUGraphBase { |
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392 | |
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393 | protected: |
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394 | |
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395 | struct NodeT { |
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396 | int first_out; |
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397 | }; |
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398 | |
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399 | struct EdgeT { |
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400 | int target; |
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401 | int next_out; |
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402 | }; |
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403 | |
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404 | std::vector<NodeT> nodes; |
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405 | std::vector<EdgeT> edges; |
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406 | |
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407 | int first_free_edge; |
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408 | |
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409 | public: |
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410 | |
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411 | typedef SmartUGraphBase Graph; |
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412 | |
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413 | class Node; |
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414 | class Edge; |
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415 | class UEdge; |
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416 | |
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417 | class Node { |
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418 | friend class SmartUGraphBase; |
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419 | protected: |
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420 | |
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421 | int id; |
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422 | explicit Node(int pid) { id = pid;} |
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423 | |
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424 | public: |
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425 | Node() {} |
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426 | Node (Invalid) { id = -1; } |
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427 | bool operator==(const Node& node) const {return id == node.id;} |
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428 | bool operator!=(const Node& node) const {return id != node.id;} |
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429 | bool operator<(const Node& node) const {return id < node.id;} |
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430 | }; |
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431 | |
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432 | class UEdge { |
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433 | friend class SmartUGraphBase; |
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434 | protected: |
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435 | |
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436 | int id; |
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437 | explicit UEdge(int pid) { id = pid;} |
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438 | |
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439 | public: |
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440 | UEdge() {} |
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441 | UEdge (Invalid) { id = -1; } |
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442 | bool operator==(const UEdge& edge) const {return id == edge.id;} |
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443 | bool operator!=(const UEdge& edge) const {return id != edge.id;} |
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444 | bool operator<(const UEdge& edge) const {return id < edge.id;} |
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445 | }; |
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446 | |
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447 | class Edge { |
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448 | friend class SmartUGraphBase; |
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449 | protected: |
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450 | |
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451 | int id; |
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452 | explicit Edge(int pid) { id = pid;} |
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453 | |
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454 | public: |
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455 | operator UEdge() const { return uEdgeFromId(id / 2); } |
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456 | |
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457 | Edge() {} |
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458 | Edge (Invalid) { id = -1; } |
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459 | bool operator==(const Edge& edge) const {return id == edge.id;} |
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460 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
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461 | bool operator<(const Edge& edge) const {return id < edge.id;} |
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462 | }; |
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463 | |
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464 | |
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465 | |
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466 | SmartUGraphBase() |
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467 | : nodes(), edges() {} |
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468 | |
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469 | |
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470 | int maxNodeId() const { return nodes.size()-1; } |
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471 | int maxUEdgeId() const { return edges.size() / 2 - 1; } |
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472 | int maxEdgeId() const { return edges.size()-1; } |
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473 | |
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474 | Node source(Edge e) const { return Node(edges[e.id ^ 1].target); } |
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475 | Node target(Edge e) const { return Node(edges[e.id].target); } |
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476 | |
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477 | Node source(UEdge e) const { return Node(edges[2 * e.id].target); } |
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478 | Node target(UEdge e) const { return Node(edges[2 * e.id + 1].target); } |
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479 | |
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480 | static bool direction(Edge e) { |
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481 | return (e.id & 1) == 1; |
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482 | } |
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483 | |
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484 | static Edge direct(UEdge e, bool d) { |
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485 | return Edge(e.id * 2 + (d ? 1 : 0)); |
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486 | } |
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487 | |
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488 | void first(Node& node) const { |
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489 | node.id = nodes.size() - 1; |
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490 | } |
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491 | |
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492 | void next(Node& node) const { |
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493 | --node.id; |
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494 | } |
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495 | |
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496 | void first(Edge& edge) const { |
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497 | edge.id = edges.size() - 1; |
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498 | } |
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499 | |
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500 | void next(Edge& edge) const { |
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501 | --edge.id; |
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502 | } |
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503 | |
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504 | void first(UEdge& edge) const { |
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505 | edge.id = edges.size() / 2 - 1; |
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506 | } |
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507 | |
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508 | void next(UEdge& edge) const { |
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509 | --edge.id; |
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510 | } |
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511 | |
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512 | void firstOut(Edge &edge, const Node& v) const { |
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513 | edge.id = nodes[v.id].first_out; |
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514 | } |
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515 | void nextOut(Edge &edge) const { |
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516 | edge.id = edges[edge.id].next_out; |
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517 | } |
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518 | |
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519 | void firstIn(Edge &edge, const Node& v) const { |
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520 | edge.id = ((nodes[v.id].first_out) ^ 1); |
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521 | if (edge.id == -2) edge.id = -1; |
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522 | } |
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523 | void nextIn(Edge &edge) const { |
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524 | edge.id = ((edges[edge.id ^ 1].next_out) ^ 1); |
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525 | if (edge.id == -2) edge.id = -1; |
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526 | } |
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527 | |
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528 | void firstInc(UEdge &edge, bool& d, const Node& v) const { |
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529 | int de = nodes[v.id].first_out; |
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530 | if (de != -1) { |
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531 | edge.id = de / 2; |
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532 | d = ((de & 1) == 1); |
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533 | } else { |
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534 | edge.id = -1; |
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535 | d = true; |
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536 | } |
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537 | } |
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538 | void nextInc(UEdge &edge, bool& d) const { |
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539 | int de = (edges[(edge.id * 2) | (d ? 1 : 0)].next_out); |
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540 | if (de != -1) { |
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541 | edge.id = de / 2; |
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542 | d = ((de & 1) == 1); |
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543 | } else { |
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544 | edge.id = -1; |
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545 | d = true; |
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546 | } |
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547 | } |
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548 | |
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549 | static int id(Node v) { return v.id; } |
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550 | static int id(Edge e) { return e.id; } |
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551 | static int id(UEdge e) { return e.id; } |
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552 | |
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553 | static Node nodeFromId(int id) { return Node(id);} |
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554 | static Edge edgeFromId(int id) { return Edge(id);} |
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555 | static UEdge uEdgeFromId(int id) { return UEdge(id);} |
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556 | |
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557 | Node addNode() { |
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558 | int n = nodes.size(); |
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559 | nodes.push_back(NodeT()); |
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560 | nodes[n].first_out = -1; |
---|
561 | |
---|
562 | return Node(n); |
---|
563 | } |
---|
564 | |
---|
565 | UEdge addEdge(Node u, Node v) { |
---|
566 | int n = edges.size(); |
---|
567 | edges.push_back(EdgeT()); |
---|
568 | edges.push_back(EdgeT()); |
---|
569 | |
---|
570 | edges[n].target = u.id; |
---|
571 | edges[n | 1].target = v.id; |
---|
572 | |
---|
573 | edges[n].next_out = nodes[v.id].first_out; |
---|
574 | nodes[v.id].first_out = n; |
---|
575 | |
---|
576 | edges[n | 1].next_out = nodes[u.id].first_out; |
---|
577 | nodes[u.id].first_out = (n | 1); |
---|
578 | |
---|
579 | return UEdge(n / 2); |
---|
580 | } |
---|
581 | |
---|
582 | void clear() { |
---|
583 | edges.clear(); |
---|
584 | nodes.clear(); |
---|
585 | } |
---|
586 | |
---|
587 | }; |
---|
588 | |
---|
589 | typedef UGraphExtender<SmartUGraphBase> ExtendedSmartUGraphBase; |
---|
590 | |
---|
591 | /// \ingroup graphs |
---|
592 | /// |
---|
593 | /// \brief A smart undirected graph class. |
---|
594 | /// |
---|
595 | /// This is a simple and fast undirected graph implementation. |
---|
596 | /// It is also quite memory efficient, but at the price |
---|
597 | /// that <b> it does support only limited (only stack-like) |
---|
598 | /// node and edge deletions</b>. |
---|
599 | /// Except from this it conforms to |
---|
600 | /// the \ref concepts::UGraph "UGraph concept". |
---|
601 | /// |
---|
602 | ///It also has an |
---|
603 | ///important extra feature that |
---|
604 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
605 | /// |
---|
606 | /// \sa concepts::UGraph. |
---|
607 | /// |
---|
608 | class SmartUGraph : public ExtendedSmartUGraphBase { |
---|
609 | private: |
---|
610 | |
---|
611 | ///SmartUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
612 | |
---|
613 | ///SmartUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
614 | /// |
---|
615 | SmartUGraph(const SmartUGraph &) : ExtendedSmartUGraphBase() {}; |
---|
616 | |
---|
617 | ///\brief Assignment of SmartUGraph to another one is \e not allowed. |
---|
618 | ///Use UGraphCopy() instead. |
---|
619 | |
---|
620 | ///Assignment of SmartUGraph to another one is \e not allowed. |
---|
621 | ///Use UGraphCopy() instead. |
---|
622 | void operator=(const SmartUGraph &) {} |
---|
623 | |
---|
624 | public: |
---|
625 | |
---|
626 | typedef ExtendedSmartUGraphBase Parent; |
---|
627 | typedef Parent::OutEdgeIt IncEdgeIt; |
---|
628 | |
---|
629 | /// Constructor |
---|
630 | |
---|
631 | /// Constructor. |
---|
632 | /// |
---|
633 | SmartUGraph() {} |
---|
634 | |
---|
635 | ///Add a new node to the graph. |
---|
636 | |
---|
637 | /// \return the new node. |
---|
638 | /// |
---|
639 | Node addNode() { return Parent::addNode(); } |
---|
640 | |
---|
641 | ///Add a new undirected edge to the graph. |
---|
642 | |
---|
643 | ///Add a new undirected edge to the graph with node \c s |
---|
644 | ///and \c t. |
---|
645 | ///\return the new undirected edge. |
---|
646 | UEdge addEdge(const Node& s, const Node& t) { |
---|
647 | return Parent::addEdge(s, t); |
---|
648 | } |
---|
649 | |
---|
650 | ///Clear the graph. |
---|
651 | |
---|
652 | ///Erase all the nodes and edges from the graph. |
---|
653 | /// |
---|
654 | void clear() { |
---|
655 | Parent::clear(); |
---|
656 | } |
---|
657 | |
---|
658 | public: |
---|
659 | |
---|
660 | class Snapshot; |
---|
661 | |
---|
662 | protected: |
---|
663 | |
---|
664 | void saveSnapshot(Snapshot &s) |
---|
665 | { |
---|
666 | s.graph = this; |
---|
667 | s.node_num = nodes.size(); |
---|
668 | s.edge_num = edges.size(); |
---|
669 | } |
---|
670 | |
---|
671 | void restoreSnapshot(const Snapshot &s) |
---|
672 | { |
---|
673 | while(s.edge_num<edges.size()) { |
---|
674 | int n=edges.size()-1; |
---|
675 | UEdge edge=uEdgeFromId(n/2); |
---|
676 | Parent::notifier(UEdge()).erase(edge); |
---|
677 | std::vector<Edge> dir; |
---|
678 | dir.push_back(edgeFromId(n)); |
---|
679 | dir.push_back(edgeFromId(n-1)); |
---|
680 | Parent::notifier(Edge()).erase(dir); |
---|
681 | nodes[edges[n].target].first_out=edges[n].next_out; |
---|
682 | nodes[edges[n-1].target].first_out=edges[n-1].next_out; |
---|
683 | edges.pop_back(); |
---|
684 | edges.pop_back(); |
---|
685 | } |
---|
686 | while(s.node_num<nodes.size()) { |
---|
687 | int n=nodes.size()-1; |
---|
688 | Node node = nodeFromId(n); |
---|
689 | Parent::notifier(Node()).erase(node); |
---|
690 | nodes.pop_back(); |
---|
691 | } |
---|
692 | } |
---|
693 | |
---|
694 | public: |
---|
695 | |
---|
696 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
697 | |
---|
698 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
699 | /// |
---|
700 | ///The newly added nodes and edges can be removed using the |
---|
701 | ///restore() function. |
---|
702 | /// |
---|
703 | ///\note After you restore a state, you cannot restore |
---|
704 | ///a later state, in other word you cannot add again the edges deleted |
---|
705 | ///by restore() using another one Snapshot instance. |
---|
706 | /// |
---|
707 | ///\warning If you do not use correctly the snapshot that can cause |
---|
708 | ///either broken program, invalid state of the graph, valid but |
---|
709 | ///not the restored graph or no change. Because the runtime performance |
---|
710 | ///the validity of the snapshot is not stored. |
---|
711 | class Snapshot |
---|
712 | { |
---|
713 | SmartUGraph *graph; |
---|
714 | protected: |
---|
715 | friend class SmartUGraph; |
---|
716 | unsigned int node_num; |
---|
717 | unsigned int edge_num; |
---|
718 | public: |
---|
719 | ///Default constructor. |
---|
720 | |
---|
721 | ///Default constructor. |
---|
722 | ///To actually make a snapshot you must call save(). |
---|
723 | /// |
---|
724 | Snapshot() : graph(0) {} |
---|
725 | ///Constructor that immediately makes a snapshot |
---|
726 | |
---|
727 | ///This constructor immediately makes a snapshot of the graph. |
---|
728 | ///\param g The graph we make a snapshot of. |
---|
729 | Snapshot(SmartUGraph &g) { |
---|
730 | g.saveSnapshot(*this); |
---|
731 | } |
---|
732 | |
---|
733 | ///Make a snapshot. |
---|
734 | |
---|
735 | ///Make a snapshot of the graph. |
---|
736 | /// |
---|
737 | ///This function can be called more than once. In case of a repeated |
---|
738 | ///call, the previous snapshot gets lost. |
---|
739 | ///\param g The graph we make the snapshot of. |
---|
740 | void save(SmartUGraph &g) |
---|
741 | { |
---|
742 | g.saveSnapshot(*this); |
---|
743 | } |
---|
744 | |
---|
745 | ///Undo the changes until a snapshot. |
---|
746 | |
---|
747 | ///Undo the changes until a snapshot created by save(). |
---|
748 | /// |
---|
749 | ///\note After you restored a state, you cannot restore |
---|
750 | ///a later state, in other word you cannot add again the edges deleted |
---|
751 | ///by restore(). |
---|
752 | void restore() |
---|
753 | { |
---|
754 | graph->restoreSnapshot(*this); |
---|
755 | } |
---|
756 | }; |
---|
757 | }; |
---|
758 | |
---|
759 | |
---|
760 | class SmartBpUGraphBase { |
---|
761 | public: |
---|
762 | |
---|
763 | class NodeSetError : public LogicError { |
---|
764 | public: |
---|
765 | virtual const char* what() const throw() { |
---|
766 | return "lemon::SmartBpUGraph::NodeSetError"; |
---|
767 | } |
---|
768 | }; |
---|
769 | |
---|
770 | protected: |
---|
771 | |
---|
772 | struct NodeT { |
---|
773 | int first; |
---|
774 | NodeT() {} |
---|
775 | NodeT(int _first) : first(_first) {} |
---|
776 | }; |
---|
777 | |
---|
778 | struct UEdgeT { |
---|
779 | int aNode, next_out; |
---|
780 | int bNode, next_in; |
---|
781 | }; |
---|
782 | |
---|
783 | std::vector<NodeT> aNodes; |
---|
784 | std::vector<NodeT> bNodes; |
---|
785 | |
---|
786 | std::vector<UEdgeT> edges; |
---|
787 | |
---|
788 | public: |
---|
789 | |
---|
790 | class Node { |
---|
791 | friend class SmartBpUGraphBase; |
---|
792 | protected: |
---|
793 | int id; |
---|
794 | |
---|
795 | explicit Node(int _id) : id(_id) {} |
---|
796 | public: |
---|
797 | Node() {} |
---|
798 | Node(Invalid) : id(-1) {} |
---|
799 | bool operator==(const Node i) const {return id==i.id;} |
---|
800 | bool operator!=(const Node i) const {return id!=i.id;} |
---|
801 | bool operator<(const Node i) const {return id<i.id;} |
---|
802 | }; |
---|
803 | |
---|
804 | class UEdge { |
---|
805 | friend class SmartBpUGraphBase; |
---|
806 | protected: |
---|
807 | int id; |
---|
808 | |
---|
809 | UEdge(int _id) : id(_id) {} |
---|
810 | public: |
---|
811 | UEdge() {} |
---|
812 | UEdge(Invalid) : id(-1) {} |
---|
813 | bool operator==(const UEdge i) const {return id==i.id;} |
---|
814 | bool operator!=(const UEdge i) const {return id!=i.id;} |
---|
815 | bool operator<(const UEdge i) const {return id<i.id;} |
---|
816 | }; |
---|
817 | |
---|
818 | void firstANode(Node& node) const { |
---|
819 | node.id = 2 * aNodes.size() - 2; |
---|
820 | if (node.id < 0) node.id = -1; |
---|
821 | } |
---|
822 | void nextANode(Node& node) const { |
---|
823 | node.id -= 2; |
---|
824 | if (node.id < 0) node.id = -1; |
---|
825 | } |
---|
826 | |
---|
827 | void firstBNode(Node& node) const { |
---|
828 | node.id = 2 * bNodes.size() - 1; |
---|
829 | } |
---|
830 | void nextBNode(Node& node) const { |
---|
831 | node.id -= 2; |
---|
832 | } |
---|
833 | |
---|
834 | void first(Node& node) const { |
---|
835 | if (aNodes.size() > 0) { |
---|
836 | node.id = 2 * aNodes.size() - 2; |
---|
837 | } else { |
---|
838 | node.id = 2 * bNodes.size() - 1; |
---|
839 | } |
---|
840 | } |
---|
841 | void next(Node& node) const { |
---|
842 | node.id -= 2; |
---|
843 | if (node.id == -2) { |
---|
844 | node.id = 2 * bNodes.size() - 1; |
---|
845 | } |
---|
846 | } |
---|
847 | |
---|
848 | void first(UEdge& edge) const { |
---|
849 | edge.id = edges.size() - 1; |
---|
850 | } |
---|
851 | void next(UEdge& edge) const { |
---|
852 | --edge.id; |
---|
853 | } |
---|
854 | |
---|
855 | void firstFromANode(UEdge& edge, const Node& node) const { |
---|
856 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
857 | edge.id = aNodes[node.id >> 1].first; |
---|
858 | } |
---|
859 | void nextFromANode(UEdge& edge) const { |
---|
860 | edge.id = edges[edge.id].next_out; |
---|
861 | } |
---|
862 | |
---|
863 | void firstFromBNode(UEdge& edge, const Node& node) const { |
---|
864 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
865 | edge.id = bNodes[node.id >> 1].first; |
---|
866 | } |
---|
867 | void nextFromBNode(UEdge& edge) const { |
---|
868 | edge.id = edges[edge.id].next_in; |
---|
869 | } |
---|
870 | |
---|
871 | static int id(const Node& node) { |
---|
872 | return node.id; |
---|
873 | } |
---|
874 | static Node nodeFromId(int id) { |
---|
875 | return Node(id); |
---|
876 | } |
---|
877 | int maxNodeId() const { |
---|
878 | return aNodes.size() > bNodes.size() ? |
---|
879 | aNodes.size() * 2 - 2 : bNodes.size() * 2 - 1; |
---|
880 | } |
---|
881 | |
---|
882 | static int id(const UEdge& edge) { |
---|
883 | return edge.id; |
---|
884 | } |
---|
885 | static UEdge uEdgeFromId(int id) { |
---|
886 | return UEdge(id); |
---|
887 | } |
---|
888 | int maxUEdgeId() const { |
---|
889 | return edges.size(); |
---|
890 | } |
---|
891 | |
---|
892 | static int aNodeId(const Node& node) { |
---|
893 | return node.id >> 1; |
---|
894 | } |
---|
895 | static Node nodeFromANodeId(int id) { |
---|
896 | return Node(id << 1); |
---|
897 | } |
---|
898 | int maxANodeId() const { |
---|
899 | return aNodes.size(); |
---|
900 | } |
---|
901 | |
---|
902 | static int bNodeId(const Node& node) { |
---|
903 | return node.id >> 1; |
---|
904 | } |
---|
905 | static Node nodeFromBNodeId(int id) { |
---|
906 | return Node((id << 1) + 1); |
---|
907 | } |
---|
908 | int maxBNodeId() const { |
---|
909 | return bNodes.size(); |
---|
910 | } |
---|
911 | |
---|
912 | Node aNode(const UEdge& edge) const { |
---|
913 | return Node(edges[edge.id].aNode); |
---|
914 | } |
---|
915 | Node bNode(const UEdge& edge) const { |
---|
916 | return Node(edges[edge.id].bNode); |
---|
917 | } |
---|
918 | |
---|
919 | static bool aNode(const Node& node) { |
---|
920 | return (node.id & 1) == 0; |
---|
921 | } |
---|
922 | |
---|
923 | static bool bNode(const Node& node) { |
---|
924 | return (node.id & 1) == 1; |
---|
925 | } |
---|
926 | |
---|
927 | Node addANode() { |
---|
928 | NodeT nodeT; |
---|
929 | nodeT.first = -1; |
---|
930 | aNodes.push_back(nodeT); |
---|
931 | return Node(aNodes.size() * 2 - 2); |
---|
932 | } |
---|
933 | |
---|
934 | Node addBNode() { |
---|
935 | NodeT nodeT; |
---|
936 | nodeT.first = -1; |
---|
937 | bNodes.push_back(nodeT); |
---|
938 | return Node(bNodes.size() * 2 - 1); |
---|
939 | } |
---|
940 | |
---|
941 | UEdge addEdge(const Node& source, const Node& target) { |
---|
942 | LEMON_ASSERT(((source.id ^ target.id) & 1) == 1, NodeSetError()); |
---|
943 | UEdgeT edgeT; |
---|
944 | if ((source.id & 1) == 0) { |
---|
945 | edgeT.aNode = source.id; |
---|
946 | edgeT.bNode = target.id; |
---|
947 | } else { |
---|
948 | edgeT.aNode = target.id; |
---|
949 | edgeT.bNode = source.id; |
---|
950 | } |
---|
951 | edgeT.next_out = aNodes[edgeT.aNode >> 1].first; |
---|
952 | aNodes[edgeT.aNode >> 1].first = edges.size(); |
---|
953 | edgeT.next_in = bNodes[edgeT.bNode >> 1].first; |
---|
954 | bNodes[edgeT.bNode >> 1].first = edges.size(); |
---|
955 | edges.push_back(edgeT); |
---|
956 | return UEdge(edges.size() - 1); |
---|
957 | } |
---|
958 | |
---|
959 | void clear() { |
---|
960 | aNodes.clear(); |
---|
961 | bNodes.clear(); |
---|
962 | edges.clear(); |
---|
963 | } |
---|
964 | |
---|
965 | typedef True NodeNumTag; |
---|
966 | int nodeNum() const { return aNodes.size() + bNodes.size(); } |
---|
967 | int aNodeNum() const { return aNodes.size(); } |
---|
968 | int bNodeNum() const { return bNodes.size(); } |
---|
969 | |
---|
970 | typedef True EdgeNumTag; |
---|
971 | int uEdgeNum() const { return edges.size(); } |
---|
972 | |
---|
973 | }; |
---|
974 | |
---|
975 | |
---|
976 | typedef BpUGraphExtender<BidirBpUGraphExtender<SmartBpUGraphBase> > |
---|
977 | ExtendedSmartBpUGraphBase; |
---|
978 | |
---|
979 | /// \ingroup graphs |
---|
980 | /// |
---|
981 | /// \brief A smart bipartite undirected graph class. |
---|
982 | /// |
---|
983 | /// This is a simple and fast bipartite undirected graph implementation. |
---|
984 | /// It is also quite memory efficient, but at the price |
---|
985 | /// that <b> it does not support node and edge deletions</b>. |
---|
986 | /// Except from this it conforms to |
---|
987 | /// the \ref concepts::BpUGraph "BpUGraph concept". |
---|
988 | /// |
---|
989 | ///It also has an |
---|
990 | ///important extra feature that |
---|
991 | ///its maps are real \ref concepts::ReferenceMap "reference map"s. |
---|
992 | /// |
---|
993 | /// \sa concepts::BpUGraph. |
---|
994 | /// |
---|
995 | class SmartBpUGraph : public ExtendedSmartBpUGraphBase { |
---|
996 | private: |
---|
997 | |
---|
998 | /// \brief SmartBpUGraph is \e not copy constructible. |
---|
999 | /// |
---|
1000 | ///SmartBpUGraph is \e not copy constructible. |
---|
1001 | SmartBpUGraph(const SmartBpUGraph &) : ExtendedSmartBpUGraphBase() {}; |
---|
1002 | |
---|
1003 | /// \brief Assignment of SmartBpUGraph to another one is \e not |
---|
1004 | /// allowed. |
---|
1005 | /// |
---|
1006 | /// Assignment of SmartBpUGraph to another one is \e not allowed. |
---|
1007 | void operator=(const SmartBpUGraph &) {} |
---|
1008 | |
---|
1009 | public: |
---|
1010 | |
---|
1011 | typedef ExtendedSmartBpUGraphBase Parent; |
---|
1012 | |
---|
1013 | ///Constructor |
---|
1014 | |
---|
1015 | ///Constructor. |
---|
1016 | /// |
---|
1017 | SmartBpUGraph() : ExtendedSmartBpUGraphBase() {} |
---|
1018 | |
---|
1019 | ///Add a new ANode to the graph. |
---|
1020 | |
---|
1021 | /// \return the new node. |
---|
1022 | /// |
---|
1023 | Node addANode() { return Parent::addANode(); } |
---|
1024 | |
---|
1025 | ///Add a new BNode to the graph. |
---|
1026 | |
---|
1027 | /// \return the new node. |
---|
1028 | /// |
---|
1029 | Node addBNode() { return Parent::addBNode(); } |
---|
1030 | |
---|
1031 | ///Add a new undirected edge to the graph. |
---|
1032 | |
---|
1033 | ///Add a new undirected edge to the graph with node \c s |
---|
1034 | ///and \c t. |
---|
1035 | ///\return the new undirected edge. |
---|
1036 | UEdge addEdge(const Node& s, const Node& t) { |
---|
1037 | return Parent::addEdge(s, t); |
---|
1038 | } |
---|
1039 | |
---|
1040 | ///Clear the graph. |
---|
1041 | |
---|
1042 | ///Erase all the nodes and edges from the graph. |
---|
1043 | /// |
---|
1044 | void clear() { |
---|
1045 | Parent::clear(); |
---|
1046 | } |
---|
1047 | |
---|
1048 | public: |
---|
1049 | |
---|
1050 | class Snapshot; |
---|
1051 | |
---|
1052 | protected: |
---|
1053 | |
---|
1054 | void restoreSnapshot(const Snapshot &s) |
---|
1055 | { |
---|
1056 | while(s.edge_num<edges.size()) { |
---|
1057 | UEdge edge = uEdgeFromId(edges.size()-1); |
---|
1058 | Parent::notifier(UEdge()).erase(edge); |
---|
1059 | std::vector<Edge> dir; |
---|
1060 | dir.push_back(Parent::direct(edge, true)); |
---|
1061 | dir.push_back(Parent::direct(edge, false)); |
---|
1062 | Parent::notifier(Edge()).erase(dir); |
---|
1063 | aNodes[edges.back().aNode >> 1].first=edges.back().next_out; |
---|
1064 | bNodes[edges.back().bNode >> 1].first=edges.back().next_in; |
---|
1065 | edges.pop_back(); |
---|
1066 | } |
---|
1067 | while(s.anode_num<aNodes.size()) { |
---|
1068 | Node node = nodeFromANodeId(aNodes.size() - 1); |
---|
1069 | Parent::notifier(ANode()).erase(node); |
---|
1070 | Parent::notifier(Node()).erase(node); |
---|
1071 | aNodes.pop_back(); |
---|
1072 | } |
---|
1073 | while(s.bnode_num<bNodes.size()) { |
---|
1074 | Node node = nodeFromBNodeId(bNodes.size() - 1); |
---|
1075 | Parent::notifier(BNode()).erase(node); |
---|
1076 | Parent::notifier(Node()).erase(node); |
---|
1077 | bNodes.pop_back(); |
---|
1078 | } |
---|
1079 | } |
---|
1080 | |
---|
1081 | public: |
---|
1082 | |
---|
1083 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
1084 | |
---|
1085 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
1086 | /// |
---|
1087 | ///The newly added nodes and edges can be removed using the |
---|
1088 | ///restore() function. |
---|
1089 | /// |
---|
1090 | ///\note After you restore a state, you cannot restore |
---|
1091 | ///a later state, in other word you cannot add again the edges deleted |
---|
1092 | ///by restore() using another one Snapshot instance. |
---|
1093 | /// |
---|
1094 | ///\warning If you do not use correctly the snapshot that can cause |
---|
1095 | ///either broken program, invalid state of the graph, valid but |
---|
1096 | ///not the restored graph or no change. Because the runtime performance |
---|
1097 | ///the validity of the snapshot is not stored. |
---|
1098 | class Snapshot |
---|
1099 | { |
---|
1100 | SmartBpUGraph *g; |
---|
1101 | protected: |
---|
1102 | friend class SmartBpUGraph; |
---|
1103 | unsigned int anode_num; |
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1104 | unsigned int bnode_num; |
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1105 | unsigned int edge_num; |
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1106 | public: |
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1107 | ///Default constructor. |
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1108 | |
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1109 | ///Default constructor. |
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1110 | ///To actually make a snapshot you must call save(). |
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1111 | /// |
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1112 | Snapshot() : g(0) {} |
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1113 | |
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1114 | ///Constructor that immediately makes a snapshot |
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1115 | |
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1116 | ///This constructor immediately makes a snapshot of the graph. |
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1117 | ///\param _g The graph we make a snapshot of. |
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1118 | Snapshot(SmartBpUGraph &_g) : g(&_g) { |
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1119 | anode_num=g->aNodes.size(); |
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1120 | bnode_num=g->bNodes.size(); |
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1121 | edge_num=g->edges.size(); |
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1122 | } |
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1123 | |
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1124 | ///Make a snapshot. |
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1125 | |
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1126 | ///Make a snapshot of the graph. |
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1127 | /// |
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1128 | ///This function can be called more than once. In case of a repeated |
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1129 | ///call, the previous snapshot gets lost. |
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1130 | ///\param _g The graph we make the snapshot of. |
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1131 | void save(SmartBpUGraph &_g) |
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1132 | { |
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1133 | g=&_g; |
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1134 | anode_num=g->aNodes.size(); |
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1135 | bnode_num=g->bNodes.size(); |
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1136 | edge_num=g->edges.size(); |
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1137 | } |
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1138 | |
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1139 | ///Undo the changes until a snapshot. |
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1140 | |
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1141 | ///Undo the changes until a snapshot created by save(). |
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1142 | /// |
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1143 | ///\note After you restored a state, you cannot restore |
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1144 | ///a later state, in other word you cannot add again the edges deleted |
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1145 | ///by restore(). |
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1146 | void restore() |
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1147 | { |
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1148 | g->restoreSnapshot(*this); |
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1149 | } |
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1150 | }; |
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1151 | }; |
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1152 | |
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1153 | |
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1154 | /// @} |
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1155 | } //namespace lemon |
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1156 | |
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1157 | |
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1158 | #endif //LEMON_SMART_GRAPH_H |
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