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_LIST_GRAPH_H |
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20 | #define LEMON_LIST_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 ListGraph, ListUGraph classes. |
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25 | |
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26 | #include <lemon/bits/base_extender.h> |
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27 | #include <lemon/bits/graph_extender.h> |
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28 | |
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29 | #include <lemon/error.h> |
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30 | |
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31 | #include <vector> |
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32 | #include <list> |
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33 | |
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34 | namespace lemon { |
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35 | |
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36 | class ListGraphBase { |
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37 | |
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38 | protected: |
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39 | struct NodeT { |
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40 | int first_in, first_out; |
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41 | int prev, next; |
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42 | }; |
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43 | |
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44 | struct EdgeT { |
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45 | int target, source; |
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46 | int prev_in, prev_out; |
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47 | int next_in, next_out; |
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48 | }; |
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49 | |
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50 | std::vector<NodeT> nodes; |
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51 | |
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52 | int first_node; |
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53 | |
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54 | int first_free_node; |
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55 | |
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56 | std::vector<EdgeT> edges; |
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57 | |
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58 | int first_free_edge; |
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59 | |
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60 | public: |
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61 | |
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62 | typedef ListGraphBase Graph; |
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63 | |
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64 | class Node { |
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65 | friend class ListGraphBase; |
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66 | protected: |
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67 | |
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68 | int id; |
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69 | explicit Node(int pid) { id = pid;} |
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70 | |
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71 | public: |
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72 | Node() {} |
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73 | Node (Invalid) { id = -1; } |
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74 | bool operator==(const Node& node) const {return id == node.id;} |
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75 | bool operator!=(const Node& node) const {return id != node.id;} |
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76 | bool operator<(const Node& node) const {return id < node.id;} |
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77 | }; |
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78 | |
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79 | class Edge { |
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80 | friend class ListGraphBase; |
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81 | protected: |
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82 | |
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83 | int id; |
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84 | explicit Edge(int pid) { id = pid;} |
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85 | |
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86 | public: |
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87 | Edge() {} |
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88 | Edge (Invalid) { id = -1; } |
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89 | bool operator==(const Edge& edge) const {return id == edge.id;} |
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90 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
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91 | bool operator<(const Edge& edge) const {return id < edge.id;} |
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92 | }; |
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93 | |
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94 | |
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95 | |
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96 | ListGraphBase() |
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97 | : nodes(), first_node(-1), |
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98 | first_free_node(-1), edges(), first_free_edge(-1) {} |
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99 | |
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100 | |
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101 | /// Maximum node ID. |
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102 | |
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103 | /// Maximum node ID. |
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104 | ///\sa id(Node) |
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105 | int maxNodeId() const { return nodes.size()-1; } |
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106 | |
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107 | /// Maximum edge ID. |
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108 | |
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109 | /// Maximum edge ID. |
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110 | ///\sa id(Edge) |
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111 | int maxEdgeId() const { return edges.size()-1; } |
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112 | |
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113 | Node source(Edge e) const { return Node(edges[e.id].source); } |
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114 | Node target(Edge e) const { return Node(edges[e.id].target); } |
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115 | |
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116 | |
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117 | void first(Node& node) const { |
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118 | node.id = first_node; |
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119 | } |
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120 | |
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121 | void next(Node& node) const { |
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122 | node.id = nodes[node.id].next; |
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123 | } |
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124 | |
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125 | |
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126 | void first(Edge& e) const { |
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127 | int n; |
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128 | for(n = first_node; |
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129 | n!=-1 && nodes[n].first_in == -1; |
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130 | n = nodes[n].next); |
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131 | e.id = (n == -1) ? -1 : nodes[n].first_in; |
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132 | } |
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133 | |
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134 | void next(Edge& edge) const { |
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135 | if (edges[edge.id].next_in != -1) { |
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136 | edge.id = edges[edge.id].next_in; |
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137 | } else { |
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138 | int n; |
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139 | for(n = nodes[edges[edge.id].target].next; |
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140 | n!=-1 && nodes[n].first_in == -1; |
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141 | n = nodes[n].next); |
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142 | edge.id = (n == -1) ? -1 : nodes[n].first_in; |
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143 | } |
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144 | } |
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145 | |
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146 | void firstOut(Edge &e, const Node& v) const { |
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147 | e.id = nodes[v.id].first_out; |
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148 | } |
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149 | void nextOut(Edge &e) const { |
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150 | e.id=edges[e.id].next_out; |
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151 | } |
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152 | |
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153 | void firstIn(Edge &e, const Node& v) const { |
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154 | e.id = nodes[v.id].first_in; |
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155 | } |
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156 | void nextIn(Edge &e) const { |
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157 | e.id=edges[e.id].next_in; |
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158 | } |
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159 | |
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160 | |
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161 | static int id(Node v) { return v.id; } |
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162 | static int id(Edge e) { return e.id; } |
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163 | |
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164 | static Node nodeFromId(int id) { return Node(id);} |
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165 | static Edge edgeFromId(int id) { return Edge(id);} |
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166 | |
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167 | /// Adds a new node to the graph. |
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168 | |
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169 | /// Adds a new node to the graph. |
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170 | /// |
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171 | /// \warning It adds the new node to the front of the list. |
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172 | /// (i.e. the lastly added node becomes the first.) |
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173 | Node addNode() { |
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174 | int n; |
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175 | |
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176 | if(first_free_node==-1) { |
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177 | n = nodes.size(); |
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178 | nodes.push_back(NodeT()); |
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179 | } else { |
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180 | n = first_free_node; |
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181 | first_free_node = nodes[n].next; |
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182 | } |
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183 | |
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184 | nodes[n].next = first_node; |
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185 | if(first_node != -1) nodes[first_node].prev = n; |
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186 | first_node = n; |
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187 | nodes[n].prev = -1; |
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188 | |
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189 | nodes[n].first_in = nodes[n].first_out = -1; |
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190 | |
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191 | return Node(n); |
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192 | } |
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193 | |
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194 | Edge addEdge(Node u, Node v) { |
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195 | int n; |
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196 | |
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197 | if (first_free_edge == -1) { |
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198 | n = edges.size(); |
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199 | edges.push_back(EdgeT()); |
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200 | } else { |
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201 | n = first_free_edge; |
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202 | first_free_edge = edges[n].next_in; |
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203 | } |
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204 | |
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205 | edges[n].source = u.id; |
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206 | edges[n].target = v.id; |
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207 | |
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208 | edges[n].next_out = nodes[u.id].first_out; |
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209 | if(nodes[u.id].first_out != -1) { |
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210 | edges[nodes[u.id].first_out].prev_out = n; |
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211 | } |
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212 | |
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213 | edges[n].next_in = nodes[v.id].first_in; |
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214 | if(nodes[v.id].first_in != -1) { |
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215 | edges[nodes[v.id].first_in].prev_in = n; |
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216 | } |
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217 | |
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218 | edges[n].prev_in = edges[n].prev_out = -1; |
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219 | |
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220 | nodes[u.id].first_out = nodes[v.id].first_in = n; |
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221 | |
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222 | return Edge(n); |
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223 | } |
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224 | |
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225 | void erase(const Node& node) { |
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226 | int n = node.id; |
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227 | |
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228 | if(nodes[n].next != -1) { |
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229 | nodes[nodes[n].next].prev = nodes[n].prev; |
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230 | } |
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231 | |
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232 | if(nodes[n].prev != -1) { |
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233 | nodes[nodes[n].prev].next = nodes[n].next; |
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234 | } else { |
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235 | first_node = nodes[n].next; |
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236 | } |
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237 | |
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238 | nodes[n].next = first_free_node; |
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239 | first_free_node = n; |
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240 | |
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241 | } |
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242 | |
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243 | void erase(const Edge& edge) { |
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244 | int n = edge.id; |
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245 | |
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246 | if(edges[n].next_in!=-1) { |
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247 | edges[edges[n].next_in].prev_in = edges[n].prev_in; |
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248 | } |
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249 | |
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250 | if(edges[n].prev_in!=-1) { |
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251 | edges[edges[n].prev_in].next_in = edges[n].next_in; |
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252 | } else { |
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253 | nodes[edges[n].target].first_in = edges[n].next_in; |
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254 | } |
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255 | |
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256 | |
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257 | if(edges[n].next_out!=-1) { |
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258 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
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259 | } |
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260 | |
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261 | if(edges[n].prev_out!=-1) { |
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262 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
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263 | } else { |
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264 | nodes[edges[n].source].first_out = edges[n].next_out; |
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265 | } |
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266 | |
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267 | edges[n].next_in = first_free_edge; |
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268 | first_free_edge = n; |
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269 | |
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270 | } |
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271 | |
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272 | void clear() { |
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273 | edges.clear(); |
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274 | nodes.clear(); |
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275 | first_node = first_free_node = first_free_edge = -1; |
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276 | } |
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277 | |
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278 | protected: |
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279 | void changeTarget(Edge e, Node n) |
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280 | { |
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281 | if(edges[e.id].next_in != -1) |
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282 | edges[edges[e.id].next_in].prev_in = edges[e.id].prev_in; |
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283 | if(edges[e.id].prev_in != -1) |
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284 | edges[edges[e.id].prev_in].next_in = edges[e.id].next_in; |
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285 | else nodes[edges[e.id].target].first_in = edges[e.id].next_in; |
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286 | if (nodes[n.id].first_in != -1) { |
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287 | edges[nodes[n.id].first_in].prev_in = e.id; |
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288 | } |
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289 | edges[e.id].target = n.id; |
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290 | edges[e.id].prev_in = -1; |
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291 | edges[e.id].next_in = nodes[n.id].first_in; |
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292 | nodes[n.id].first_in = e.id; |
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293 | } |
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294 | void changeSource(Edge e, Node n) |
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295 | { |
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296 | if(edges[e.id].next_out != -1) |
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297 | edges[edges[e.id].next_out].prev_out = edges[e.id].prev_out; |
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298 | if(edges[e.id].prev_out != -1) |
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299 | edges[edges[e.id].prev_out].next_out = edges[e.id].next_out; |
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300 | else nodes[edges[e.id].source].first_out = edges[e.id].next_out; |
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301 | if (nodes[n.id].first_out != -1) { |
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302 | edges[nodes[n.id].first_out].prev_out = e.id; |
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303 | } |
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304 | edges[e.id].source = n.id; |
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305 | edges[e.id].prev_out = -1; |
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306 | edges[e.id].next_out = nodes[n.id].first_out; |
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307 | nodes[n.id].first_out = e.id; |
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308 | } |
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309 | |
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310 | }; |
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311 | |
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312 | typedef GraphExtender<ListGraphBase> ExtendedListGraphBase; |
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313 | |
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314 | /// \addtogroup graphs |
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315 | /// @{ |
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316 | |
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317 | ///A list graph class. |
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318 | |
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319 | ///This is a simple and fast graph implementation. |
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320 | /// |
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321 | ///It conforms to the \ref concept::Graph "Graph concept" and it |
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322 | ///also provides several additional useful extra functionalities. |
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323 | ///The most of the member functions and nested classes are |
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324 | ///documented only in the concept class. |
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325 | ///\sa concept::Graph. |
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326 | |
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327 | class ListGraph : public ExtendedListGraphBase { |
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328 | public: |
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329 | |
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330 | typedef ExtendedListGraphBase Parent; |
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331 | |
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332 | ///Add a new node to the graph. |
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333 | |
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334 | /// \return the new node. |
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335 | /// |
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336 | Node addNode() { return Parent::addNode(); } |
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337 | |
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338 | ///Add a new edge to the graph. |
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339 | |
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340 | ///Add a new edge to the graph with source node \c s |
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341 | ///and target node \c t. |
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342 | ///\return the new edge. |
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343 | Edge addEdge(const Node& s, const Node& t) { |
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344 | return Parent::addEdge(s, t); |
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345 | } |
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346 | |
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347 | /// Changes the target of \c e to \c n |
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348 | |
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349 | /// Changes the target of \c e to \c n |
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350 | /// |
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351 | ///\note The <tt>Edge</tt>s and <tt>OutEdgeIt</tt>s referencing |
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352 | ///the changed edge remain valid. However <tt>InEdgeIt</tt>s are |
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353 | ///invalidated. |
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354 | ///\warning This functionality cannot be used together with the Snapshot |
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355 | ///feature. |
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356 | void changeTarget(Edge e, Node n) { |
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357 | Parent::changeTarget(e,n); |
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358 | } |
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359 | /// Changes the source of \c e to \c n |
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360 | |
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361 | /// Changes the source of \c e to \c n |
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362 | /// |
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363 | ///\note The <tt>Edge</tt>s and <tt>InEdgeIt</tt>s referencing |
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364 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
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365 | ///invalidated. |
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366 | ///\warning This functionality cannot be used together with the Snapshot |
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367 | ///feature. |
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368 | void changeSource(Edge e, Node n) { |
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369 | Parent::changeSource(e,n); |
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370 | } |
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371 | |
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372 | /// Invert the direction of an edge. |
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373 | |
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374 | ///\note The <tt>Edge</tt>s referencing the changed edge remain |
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375 | ///valid. However <tt>OutEdgeIt</tt>s and <tt>InEdgeIt</tt>s are |
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376 | ///invalidated. |
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377 | ///\warning This functionality cannot be used together with the Snapshot |
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378 | ///feature. |
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379 | void reverseEdge(Edge e) { |
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380 | Node t=target(e); |
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381 | changeTarget(e,source(e)); |
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382 | changeSource(e,t); |
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383 | } |
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384 | |
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385 | /// \brief Using this it is possible to avoid the superfluous memory |
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386 | /// allocation. |
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387 | |
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388 | ///Using this it is possible to avoid the superfluous memory |
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389 | ///allocation: if you know that the graph you want to build will |
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390 | ///contain at least 10 million nodes then it is worth reserving |
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391 | ///space for this amount before starting to build the graph. |
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392 | void reserveNode(int n) { nodes.reserve(n); }; |
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393 | |
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394 | /// \brief Using this it is possible to avoid the superfluous memory |
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395 | /// allocation. |
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396 | |
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397 | ///Using this it is possible to avoid the superfluous memory |
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398 | ///allocation: see the \ref reserveNode function. |
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399 | void reserveEdge(int n) { edges.reserve(n); }; |
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400 | |
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401 | |
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402 | ///Contract two nodes. |
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403 | |
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404 | ///This function contracts two nodes. |
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405 | /// |
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406 | ///Node \p b will be removed but instead of deleting |
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407 | ///incident edges, they will be joined to \p a. |
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408 | ///The last parameter \p r controls whether to remove loops. \c true |
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409 | ///means that loops will be removed. |
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410 | /// |
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411 | ///\note The <tt>Edge</tt>s |
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412 | ///referencing a moved edge remain |
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413 | ///valid. However <tt>InEdge</tt>s and <tt>OutEdge</tt>s |
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414 | ///may be invalidated. |
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415 | ///\warning This functionality cannot be used together with the Snapshot |
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416 | ///feature. |
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417 | void contract(Node a, Node b, bool r = true) |
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418 | { |
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419 | for(OutEdgeIt e(*this,b);e!=INVALID;) { |
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420 | OutEdgeIt f=e; |
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421 | ++f; |
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422 | if(r && target(e)==a) erase(e); |
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423 | else changeSource(e,a); |
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424 | e=f; |
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425 | } |
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426 | for(InEdgeIt e(*this,b);e!=INVALID;) { |
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427 | InEdgeIt f=e; |
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428 | ++f; |
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429 | if(r && source(e)==a) erase(e); |
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430 | else changeTarget(e,a); |
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431 | e=f; |
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432 | } |
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433 | erase(b); |
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434 | } |
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435 | |
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436 | ///Split a node. |
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437 | |
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438 | ///This function splits a node. First a new node is added to the graph, |
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439 | ///then the source of each outgoing edge of \c n is moved to this new node. |
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440 | ///If \c connect is \c true (this is the default value), then a new edge |
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441 | ///from \c n to the newly created node is also added. |
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442 | ///\return The newly created node. |
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443 | /// |
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444 | ///\note The <tt>Edge</tt>s |
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445 | ///referencing a moved edge remain |
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446 | ///valid. However <tt>InEdge</tt>s and <tt>OutEdge</tt>s |
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447 | ///may be invalidated. |
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448 | ///\warning This functionality cannot be used together with the Snapshot |
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449 | ///feature. |
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450 | ///\todo It could be implemented in a bit faster way. |
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451 | Node split(Node n, bool connect = true) { |
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452 | Node b = addNode(); |
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453 | for(OutEdgeIt e(*this,n);e!=INVALID;) { |
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454 | OutEdgeIt f=e; |
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455 | ++f; |
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456 | changeSource(e,b); |
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457 | e=f; |
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458 | } |
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459 | if (connect) addEdge(n,b); |
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460 | return b; |
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461 | } |
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462 | |
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463 | ///Split an edge. |
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464 | |
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465 | ///This function splits an edge. First a new node \c b is added to |
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466 | ///the graph, then the original edge is re-targeted to \c |
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467 | ///b. Finally an edge from \c b to the original target is added. |
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468 | ///\return The newly created node. |
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469 | ///\warning This functionality |
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470 | ///cannot be used together with the Snapshot feature. |
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471 | Node split(Edge e) { |
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472 | Node b = addNode(); |
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473 | addEdge(b,target(e)); |
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474 | changeTarget(e,b); |
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475 | return b; |
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476 | } |
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477 | |
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478 | /// \brief Class to make a snapshot of the graph and restore |
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479 | /// to it later. |
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480 | /// |
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481 | /// Class to make a snapshot of the graph and to restore it |
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482 | /// later. |
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483 | /// |
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484 | /// The newly added nodes and edges can be removed using the |
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485 | /// restore() function. |
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486 | /// |
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487 | /// \warning Edge and node deletions cannot be restored. |
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488 | class Snapshot { |
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489 | public: |
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490 | |
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491 | class UnsupportedOperation : public LogicError { |
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492 | public: |
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493 | virtual const char* exceptionName() const { |
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494 | return "lemon::ListGraph::Snapshot::UnsupportedOperation"; |
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495 | } |
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496 | }; |
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497 | |
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498 | |
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499 | protected: |
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500 | |
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501 | typedef Parent::NodeNotifier NodeNotifier; |
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502 | |
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503 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
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504 | public: |
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505 | |
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506 | NodeObserverProxy(Snapshot& _snapshot) |
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507 | : snapshot(_snapshot) {} |
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508 | |
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509 | using NodeNotifier::ObserverBase::attach; |
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510 | using NodeNotifier::ObserverBase::detach; |
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511 | using NodeNotifier::ObserverBase::attached; |
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512 | |
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513 | protected: |
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514 | |
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515 | virtual void add(const Node& node) { |
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516 | snapshot.addNode(node); |
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517 | } |
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518 | virtual void add(const std::vector<Node>& nodes) { |
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519 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
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520 | snapshot.addNode(nodes[i]); |
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521 | } |
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522 | } |
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523 | virtual void erase(const Node& node) { |
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524 | snapshot.eraseNode(node); |
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525 | } |
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526 | virtual void erase(const std::vector<Node>& nodes) { |
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527 | for (int i = 0; i < (int)nodes.size(); ++i) { |
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528 | if (!snapshot.eraseNode(nodes[i])) break; |
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529 | } |
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530 | } |
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531 | virtual void build() { |
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532 | NodeNotifier* notifier = getNotifier(); |
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533 | Node node; |
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534 | std::vector<Node> nodes; |
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535 | for (notifier->first(node); node != INVALID; notifier->next(node)) { |
---|
536 | nodes.push_back(node); |
---|
537 | } |
---|
538 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
539 | snapshot.addNode(nodes[i]); |
---|
540 | } |
---|
541 | } |
---|
542 | virtual void clear() { |
---|
543 | NodeNotifier* notifier = getNotifier(); |
---|
544 | Node node; |
---|
545 | for (notifier->first(node); node != INVALID; notifier->next(node)) { |
---|
546 | if (!snapshot.eraseNode(node)) break; |
---|
547 | } |
---|
548 | } |
---|
549 | |
---|
550 | Snapshot& snapshot; |
---|
551 | }; |
---|
552 | |
---|
553 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
554 | public: |
---|
555 | |
---|
556 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
557 | : snapshot(_snapshot) {} |
---|
558 | |
---|
559 | using EdgeNotifier::ObserverBase::attach; |
---|
560 | using EdgeNotifier::ObserverBase::detach; |
---|
561 | using EdgeNotifier::ObserverBase::attached; |
---|
562 | |
---|
563 | protected: |
---|
564 | |
---|
565 | virtual void add(const Edge& edge) { |
---|
566 | snapshot.addEdge(edge); |
---|
567 | } |
---|
568 | virtual void add(const std::vector<Edge>& edges) { |
---|
569 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
570 | snapshot.addEdge(edges[i]); |
---|
571 | } |
---|
572 | } |
---|
573 | virtual void erase(const Edge& edge) { |
---|
574 | snapshot.eraseEdge(edge); |
---|
575 | } |
---|
576 | virtual void erase(const std::vector<Edge>& edges) { |
---|
577 | for (int i = 0; i < (int)edges.size(); ++i) { |
---|
578 | if (!snapshot.eraseEdge(edges[i])) break; |
---|
579 | } |
---|
580 | } |
---|
581 | virtual void build() { |
---|
582 | EdgeNotifier* notifier = getNotifier(); |
---|
583 | Edge edge; |
---|
584 | std::vector<Edge> edges; |
---|
585 | for (notifier->first(edge); edge != INVALID; notifier->next(edge)) { |
---|
586 | edges.push_back(edge); |
---|
587 | } |
---|
588 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
589 | snapshot.addEdge(edges[i]); |
---|
590 | } |
---|
591 | } |
---|
592 | virtual void clear() { |
---|
593 | EdgeNotifier* notifier = getNotifier(); |
---|
594 | Edge edge; |
---|
595 | for (notifier->first(edge); edge != INVALID; notifier->next(edge)) { |
---|
596 | if (!snapshot.eraseEdge(edge)) break; |
---|
597 | } |
---|
598 | } |
---|
599 | |
---|
600 | Snapshot& snapshot; |
---|
601 | }; |
---|
602 | |
---|
603 | ListGraph *graph; |
---|
604 | |
---|
605 | NodeObserverProxy node_observer_proxy; |
---|
606 | EdgeObserverProxy edge_observer_proxy; |
---|
607 | |
---|
608 | std::list<Node> added_nodes; |
---|
609 | std::list<Edge> added_edges; |
---|
610 | |
---|
611 | |
---|
612 | void addNode(const Node& node) { |
---|
613 | added_nodes.push_front(node); |
---|
614 | } |
---|
615 | bool eraseNode(const Node& node) { |
---|
616 | std::list<Node>::iterator it = |
---|
617 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
618 | if (it == added_nodes.end()) { |
---|
619 | clear(); |
---|
620 | return false; |
---|
621 | } else { |
---|
622 | added_nodes.erase(it); |
---|
623 | return true; |
---|
624 | } |
---|
625 | } |
---|
626 | |
---|
627 | void addEdge(const Edge& edge) { |
---|
628 | added_edges.push_front(edge); |
---|
629 | } |
---|
630 | bool eraseEdge(const Edge& edge) { |
---|
631 | std::list<Edge>::iterator it = |
---|
632 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
633 | if (it == added_edges.end()) { |
---|
634 | clear(); |
---|
635 | return false; |
---|
636 | } else { |
---|
637 | added_edges.erase(it); |
---|
638 | return true; |
---|
639 | } |
---|
640 | } |
---|
641 | |
---|
642 | void attach(ListGraph &_graph) { |
---|
643 | graph = &_graph; |
---|
644 | node_observer_proxy.attach(graph->getNotifier(Node())); |
---|
645 | edge_observer_proxy.attach(graph->getNotifier(Edge())); |
---|
646 | } |
---|
647 | |
---|
648 | void detach() { |
---|
649 | node_observer_proxy.detach(); |
---|
650 | edge_observer_proxy.detach(); |
---|
651 | } |
---|
652 | |
---|
653 | void clear() { |
---|
654 | detach(); |
---|
655 | added_nodes.clear(); |
---|
656 | added_edges.clear(); |
---|
657 | } |
---|
658 | |
---|
659 | public: |
---|
660 | |
---|
661 | /// \brief Default constructur. |
---|
662 | /// |
---|
663 | /// Default constructor. |
---|
664 | /// To actually make a snapshot you must call save(). |
---|
665 | Snapshot() |
---|
666 | : graph(0), node_observer_proxy(*this), |
---|
667 | edge_observer_proxy(*this) {} |
---|
668 | |
---|
669 | /// \brief Constructor that immediately makes a snapshot. |
---|
670 | /// |
---|
671 | /// This constructor immediately makes a snapshot of the graph. |
---|
672 | /// \param _graph The graph we make a snapshot of. |
---|
673 | Snapshot(ListGraph &_graph) |
---|
674 | : node_observer_proxy(*this), |
---|
675 | edge_observer_proxy(*this) { |
---|
676 | attach(_graph); |
---|
677 | } |
---|
678 | |
---|
679 | /// \brief Make a snapshot. |
---|
680 | /// |
---|
681 | /// Make a snapshot of the graph. |
---|
682 | /// |
---|
683 | /// This function can be called more than once. In case of a repeated |
---|
684 | /// call, the previous snapshot gets lost. |
---|
685 | /// \param _graph The graph we make the snapshot of. |
---|
686 | void save(ListGraph &_graph) { |
---|
687 | clear(); |
---|
688 | attach(_graph); |
---|
689 | } |
---|
690 | |
---|
691 | /// \brief Undo the changes until the last snapshot. |
---|
692 | // |
---|
693 | /// Undo the changes until the last snapshot created by save(). |
---|
694 | void restore() { |
---|
695 | detach(); |
---|
696 | while(!added_edges.empty()) { |
---|
697 | graph->erase(added_edges.front()); |
---|
698 | added_edges.pop_front(); |
---|
699 | } |
---|
700 | while(!added_nodes.empty()) { |
---|
701 | graph->erase(added_nodes.front()); |
---|
702 | added_nodes.pop_front(); |
---|
703 | } |
---|
704 | } |
---|
705 | |
---|
706 | /// \brief Gives back true when the snapshot is valid. |
---|
707 | /// |
---|
708 | /// Gives back true when the snapshot is valid. |
---|
709 | bool valid() const { |
---|
710 | return node_observer_proxy.attached(); |
---|
711 | } |
---|
712 | }; |
---|
713 | |
---|
714 | }; |
---|
715 | |
---|
716 | ///@} |
---|
717 | |
---|
718 | /**************** Undirected List Graph ****************/ |
---|
719 | |
---|
720 | typedef UGraphExtender<UndirGraphExtender<ListGraphBase> > |
---|
721 | ExtendedListUGraphBase; |
---|
722 | |
---|
723 | /// \addtogroup graphs |
---|
724 | /// @{ |
---|
725 | |
---|
726 | ///An undirected list graph class. |
---|
727 | |
---|
728 | ///This is a simple and fast undirected graph implementation. |
---|
729 | /// |
---|
730 | ///It conforms to the |
---|
731 | ///\ref concept::UGraph "UGraph concept". |
---|
732 | /// |
---|
733 | ///\sa concept::UGraph. |
---|
734 | /// |
---|
735 | ///\todo Snapshot, reverseEdge(), changeTarget(), changeSource(), contract() |
---|
736 | ///haven't been implemented yet. |
---|
737 | /// |
---|
738 | class ListUGraph : public ExtendedListUGraphBase { |
---|
739 | public: |
---|
740 | typedef ExtendedListUGraphBase Parent; |
---|
741 | /// \brief Add a new node to the graph. |
---|
742 | /// |
---|
743 | /// \return the new node. |
---|
744 | /// |
---|
745 | Node addNode() { return Parent::addNode(); } |
---|
746 | |
---|
747 | /// \brief Add a new edge to the graph. |
---|
748 | /// |
---|
749 | /// Add a new edge to the graph with source node \c s |
---|
750 | /// and target node \c t. |
---|
751 | /// \return the new undirected edge. |
---|
752 | UEdge addEdge(const Node& s, const Node& t) { |
---|
753 | return Parent::addEdge(s, t); |
---|
754 | } |
---|
755 | /// \brief Changes the target of \c e to \c n |
---|
756 | /// |
---|
757 | /// Changes the target of \c e to \c n |
---|
758 | /// |
---|
759 | /// \note The <tt>Edge</tt>'s and <tt>OutEdge</tt>'s |
---|
760 | /// referencing the changed edge remain |
---|
761 | /// valid. However <tt>InEdge</tt>'s are invalidated. |
---|
762 | void changeTarget(UEdge e, Node n) { |
---|
763 | Parent::changeTarget(e,n); |
---|
764 | } |
---|
765 | /// Changes the source of \c e to \c n |
---|
766 | /// |
---|
767 | /// Changes the source of \c e to \c n |
---|
768 | /// |
---|
769 | ///\note The <tt>Edge</tt>'s and <tt>InEdge</tt>'s |
---|
770 | ///referencing the changed edge remain |
---|
771 | ///valid. However <tt>OutEdge</tt>'s are invalidated. |
---|
772 | void changeSource(UEdge e, Node n) { |
---|
773 | Parent::changeSource(e,n); |
---|
774 | } |
---|
775 | /// \brief Contract two nodes. |
---|
776 | /// |
---|
777 | /// This function contracts two nodes. |
---|
778 | /// |
---|
779 | /// Node \p b will be removed but instead of deleting |
---|
780 | /// its neighboring edges, they will be joined to \p a. |
---|
781 | /// The last parameter \p r controls whether to remove loops. \c true |
---|
782 | /// means that loops will be removed. |
---|
783 | /// |
---|
784 | /// \note The <tt>Edge</tt>s |
---|
785 | /// referencing a moved edge remain |
---|
786 | /// valid. |
---|
787 | void contract(Node a, Node b, bool r = true) { |
---|
788 | for(IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
789 | IncEdgeIt f = e; ++f; |
---|
790 | if (r && runningNode(e) == a) { |
---|
791 | erase(e); |
---|
792 | } else if (source(e) == b) { |
---|
793 | changeSource(e, a); |
---|
794 | } else { |
---|
795 | changeTarget(e, a); |
---|
796 | } |
---|
797 | e = f; |
---|
798 | } |
---|
799 | erase(b); |
---|
800 | } |
---|
801 | }; |
---|
802 | |
---|
803 | |
---|
804 | class ListBpUGraphBase { |
---|
805 | public: |
---|
806 | |
---|
807 | class NodeSetError : public LogicError { |
---|
808 | virtual const char* exceptionName() const { |
---|
809 | return "lemon::ListBpUGraph::NodeSetError"; |
---|
810 | } |
---|
811 | }; |
---|
812 | |
---|
813 | protected: |
---|
814 | |
---|
815 | struct NodeT { |
---|
816 | int first_edge, prev, next; |
---|
817 | }; |
---|
818 | |
---|
819 | struct UEdgeT { |
---|
820 | int aNode, prev_out, next_out; |
---|
821 | int bNode, prev_in, next_in; |
---|
822 | }; |
---|
823 | |
---|
824 | std::vector<NodeT> aNodes; |
---|
825 | std::vector<NodeT> bNodes; |
---|
826 | |
---|
827 | std::vector<UEdgeT> edges; |
---|
828 | |
---|
829 | int first_anode; |
---|
830 | int first_free_anode; |
---|
831 | |
---|
832 | int first_bnode; |
---|
833 | int first_free_bnode; |
---|
834 | |
---|
835 | int first_free_edge; |
---|
836 | |
---|
837 | public: |
---|
838 | |
---|
839 | class Node { |
---|
840 | friend class ListBpUGraphBase; |
---|
841 | protected: |
---|
842 | int id; |
---|
843 | |
---|
844 | explicit Node(int _id) : id(_id) {} |
---|
845 | public: |
---|
846 | Node() {} |
---|
847 | Node(Invalid) { id = -1; } |
---|
848 | bool operator==(const Node i) const {return id==i.id;} |
---|
849 | bool operator!=(const Node i) const {return id!=i.id;} |
---|
850 | bool operator<(const Node i) const {return id<i.id;} |
---|
851 | }; |
---|
852 | |
---|
853 | class UEdge { |
---|
854 | friend class ListBpUGraphBase; |
---|
855 | protected: |
---|
856 | int id; |
---|
857 | |
---|
858 | explicit UEdge(int _id) { id = _id;} |
---|
859 | public: |
---|
860 | UEdge() {} |
---|
861 | UEdge (Invalid) { id = -1; } |
---|
862 | bool operator==(const UEdge i) const {return id==i.id;} |
---|
863 | bool operator!=(const UEdge i) const {return id!=i.id;} |
---|
864 | bool operator<(const UEdge i) const {return id<i.id;} |
---|
865 | }; |
---|
866 | |
---|
867 | ListBpUGraphBase() |
---|
868 | : first_anode(-1), first_free_anode(-1), |
---|
869 | first_bnode(-1), first_free_bnode(-1), |
---|
870 | first_free_edge(-1) {} |
---|
871 | |
---|
872 | void firstANode(Node& node) const { |
---|
873 | node.id = first_anode != -1 ? (first_anode << 1) : -1; |
---|
874 | } |
---|
875 | void nextANode(Node& node) const { |
---|
876 | node.id = aNodes[node.id >> 1].next; |
---|
877 | } |
---|
878 | |
---|
879 | void firstBNode(Node& node) const { |
---|
880 | node.id = first_bnode != -1 ? (first_bnode << 1) + 1 : -1; |
---|
881 | } |
---|
882 | void nextBNode(Node& node) const { |
---|
883 | node.id = bNodes[node.id >> 1].next; |
---|
884 | } |
---|
885 | |
---|
886 | void first(Node& node) const { |
---|
887 | if (first_anode != -1) { |
---|
888 | node.id = (first_anode << 1); |
---|
889 | } else if (first_bnode != -1) { |
---|
890 | node.id = (first_bnode << 1) + 1; |
---|
891 | } else { |
---|
892 | node.id = -1; |
---|
893 | } |
---|
894 | } |
---|
895 | void next(Node& node) const { |
---|
896 | if (aNode(node)) { |
---|
897 | node.id = aNodes[node.id >> 1].next; |
---|
898 | if (node.id == -1) { |
---|
899 | if (first_bnode != -1) { |
---|
900 | node.id = (first_bnode << 1) + 1; |
---|
901 | } |
---|
902 | } |
---|
903 | } else { |
---|
904 | node.id = bNodes[node.id >> 1].next; |
---|
905 | } |
---|
906 | } |
---|
907 | |
---|
908 | void first(UEdge& edge) const { |
---|
909 | int aNodeId = first_anode; |
---|
910 | while (aNodeId != -1 && aNodes[aNodeId].first_edge == -1) { |
---|
911 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
912 | aNodes[aNodeId].next >> 1 : -1; |
---|
913 | } |
---|
914 | if (aNodeId != -1) { |
---|
915 | edge.id = aNodes[aNodeId].first_edge; |
---|
916 | } else { |
---|
917 | edge.id = -1; |
---|
918 | } |
---|
919 | } |
---|
920 | void next(UEdge& edge) const { |
---|
921 | int aNodeId = edges[edge.id].aNode >> 1; |
---|
922 | edge.id = edges[edge.id].next_out; |
---|
923 | if (edge.id == -1) { |
---|
924 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
925 | aNodes[aNodeId].next >> 1 : -1; |
---|
926 | while (aNodeId != -1 && aNodes[aNodeId].first_edge == -1) { |
---|
927 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
928 | aNodes[aNodeId].next >> 1 : -1; |
---|
929 | } |
---|
930 | if (aNodeId != -1) { |
---|
931 | edge.id = aNodes[aNodeId].first_edge; |
---|
932 | } else { |
---|
933 | edge.id = -1; |
---|
934 | } |
---|
935 | } |
---|
936 | } |
---|
937 | |
---|
938 | void firstFromANode(UEdge& edge, const Node& node) const { |
---|
939 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
940 | edge.id = aNodes[node.id >> 1].first_edge; |
---|
941 | } |
---|
942 | void nextFromANode(UEdge& edge) const { |
---|
943 | edge.id = edges[edge.id].next_out; |
---|
944 | } |
---|
945 | |
---|
946 | void firstFromBNode(UEdge& edge, const Node& node) const { |
---|
947 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
948 | edge.id = bNodes[node.id >> 1].first_edge; |
---|
949 | } |
---|
950 | void nextFromBNode(UEdge& edge) const { |
---|
951 | edge.id = edges[edge.id].next_in; |
---|
952 | } |
---|
953 | |
---|
954 | static int id(const Node& node) { |
---|
955 | return node.id; |
---|
956 | } |
---|
957 | static Node nodeFromId(int id) { |
---|
958 | return Node(id); |
---|
959 | } |
---|
960 | int maxNodeId() const { |
---|
961 | return aNodes.size() > bNodes.size() ? |
---|
962 | aNodes.size() * 2 - 2 : bNodes.size() * 2 - 1; |
---|
963 | } |
---|
964 | |
---|
965 | static int id(const UEdge& edge) { |
---|
966 | return edge.id; |
---|
967 | } |
---|
968 | static UEdge uEdgeFromId(int id) { |
---|
969 | return UEdge(id); |
---|
970 | } |
---|
971 | int maxUEdgeId() const { |
---|
972 | return edges.size(); |
---|
973 | } |
---|
974 | |
---|
975 | static int aNodeId(const Node& node) { |
---|
976 | return node.id >> 1; |
---|
977 | } |
---|
978 | static Node fromANodeId(int id) { |
---|
979 | return Node(id << 1); |
---|
980 | } |
---|
981 | int maxANodeId() const { |
---|
982 | return aNodes.size(); |
---|
983 | } |
---|
984 | |
---|
985 | static int bNodeId(const Node& node) { |
---|
986 | return node.id >> 1; |
---|
987 | } |
---|
988 | static Node fromBNodeId(int id) { |
---|
989 | return Node((id << 1) + 1); |
---|
990 | } |
---|
991 | int maxBNodeId() const { |
---|
992 | return bNodes.size(); |
---|
993 | } |
---|
994 | |
---|
995 | Node aNode(const UEdge& edge) const { |
---|
996 | return Node(edges[edge.id].aNode); |
---|
997 | } |
---|
998 | Node bNode(const UEdge& edge) const { |
---|
999 | return Node(edges[edge.id].bNode); |
---|
1000 | } |
---|
1001 | |
---|
1002 | static bool aNode(const Node& node) { |
---|
1003 | return (node.id & 1) == 0; |
---|
1004 | } |
---|
1005 | |
---|
1006 | static bool bNode(const Node& node) { |
---|
1007 | return (node.id & 1) == 1; |
---|
1008 | } |
---|
1009 | |
---|
1010 | Node addANode() { |
---|
1011 | int aNodeId; |
---|
1012 | if (first_free_anode == -1) { |
---|
1013 | aNodeId = aNodes.size(); |
---|
1014 | aNodes.push_back(NodeT()); |
---|
1015 | } else { |
---|
1016 | aNodeId = first_free_anode; |
---|
1017 | first_free_anode = aNodes[first_free_anode].next; |
---|
1018 | } |
---|
1019 | if (first_anode != -1) { |
---|
1020 | aNodes[aNodeId].next = first_anode << 1; |
---|
1021 | aNodes[first_anode].prev = aNodeId << 1; |
---|
1022 | } else { |
---|
1023 | aNodes[aNodeId].next = -1; |
---|
1024 | } |
---|
1025 | aNodes[aNodeId].prev = -1; |
---|
1026 | first_anode = aNodeId; |
---|
1027 | aNodes[aNodeId].first_edge = -1; |
---|
1028 | return Node(aNodeId << 1); |
---|
1029 | } |
---|
1030 | |
---|
1031 | Node addBNode() { |
---|
1032 | int bNodeId; |
---|
1033 | if (first_free_bnode == -1) { |
---|
1034 | bNodeId = bNodes.size(); |
---|
1035 | bNodes.push_back(NodeT()); |
---|
1036 | } else { |
---|
1037 | bNodeId = first_free_bnode; |
---|
1038 | first_free_bnode = bNodes[first_free_bnode].next; |
---|
1039 | } |
---|
1040 | if (first_bnode != -1) { |
---|
1041 | bNodes[bNodeId].next = (first_bnode << 1) + 1; |
---|
1042 | bNodes[first_bnode].prev = (bNodeId << 1) + 1; |
---|
1043 | } else { |
---|
1044 | bNodes[bNodeId].next = -1; |
---|
1045 | } |
---|
1046 | first_bnode = bNodeId; |
---|
1047 | bNodes[bNodeId].first_edge = -1; |
---|
1048 | return Node((bNodeId << 1) + 1); |
---|
1049 | } |
---|
1050 | |
---|
1051 | UEdge addEdge(const Node& source, const Node& target) { |
---|
1052 | LEMON_ASSERT(((source.id ^ target.id) & 1) == 1, NodeSetError()); |
---|
1053 | int edgeId; |
---|
1054 | if (first_free_edge != -1) { |
---|
1055 | edgeId = first_free_edge; |
---|
1056 | first_free_edge = edges[edgeId].next_out; |
---|
1057 | } else { |
---|
1058 | edgeId = edges.size(); |
---|
1059 | edges.push_back(UEdgeT()); |
---|
1060 | } |
---|
1061 | if ((source.id & 1) == 0) { |
---|
1062 | edges[edgeId].aNode = source.id; |
---|
1063 | edges[edgeId].bNode = target.id; |
---|
1064 | } else { |
---|
1065 | edges[edgeId].aNode = target.id; |
---|
1066 | edges[edgeId].bNode = source.id; |
---|
1067 | } |
---|
1068 | edges[edgeId].next_out = aNodes[edges[edgeId].aNode >> 1].first_edge; |
---|
1069 | edges[edgeId].prev_out = -1; |
---|
1070 | if (aNodes[edges[edgeId].aNode >> 1].first_edge != -1) { |
---|
1071 | edges[aNodes[edges[edgeId].aNode >> 1].first_edge].prev_out = edgeId; |
---|
1072 | } |
---|
1073 | aNodes[edges[edgeId].aNode >> 1].first_edge = edgeId; |
---|
1074 | edges[edgeId].next_in = bNodes[edges[edgeId].bNode >> 1].first_edge; |
---|
1075 | edges[edgeId].prev_in = -1; |
---|
1076 | if (bNodes[edges[edgeId].bNode >> 1].first_edge != -1) { |
---|
1077 | edges[bNodes[edges[edgeId].bNode >> 1].first_edge].prev_in = edgeId; |
---|
1078 | } |
---|
1079 | bNodes[edges[edgeId].bNode >> 1].first_edge = edgeId; |
---|
1080 | return UEdge(edgeId); |
---|
1081 | } |
---|
1082 | |
---|
1083 | void erase(const Node& node) { |
---|
1084 | if (aNode(node)) { |
---|
1085 | int aNodeId = node.id >> 1; |
---|
1086 | if (aNodes[aNodeId].prev != -1) { |
---|
1087 | aNodes[aNodes[aNodeId].prev >> 1].next = aNodes[aNodeId].next; |
---|
1088 | } else { |
---|
1089 | first_anode = aNodes[aNodeId].next >> 1; |
---|
1090 | } |
---|
1091 | if (aNodes[aNodeId].next != -1) { |
---|
1092 | aNodes[aNodes[aNodeId].next >> 1].prev = aNodes[aNodeId].prev; |
---|
1093 | } |
---|
1094 | aNodes[aNodeId].next = first_free_anode; |
---|
1095 | first_free_anode = aNodeId; |
---|
1096 | } else { |
---|
1097 | int bNodeId = node.id >> 1; |
---|
1098 | if (bNodes[bNodeId].prev != -1) { |
---|
1099 | bNodes[bNodes[bNodeId].prev >> 1].next = bNodes[bNodeId].next; |
---|
1100 | } else { |
---|
1101 | first_bnode = bNodes[bNodeId].next >> 1; |
---|
1102 | } |
---|
1103 | if (bNodes[bNodeId].next != -1) { |
---|
1104 | bNodes[bNodes[bNodeId].next >> 1].prev = bNodes[bNodeId].prev; |
---|
1105 | } |
---|
1106 | bNodes[bNodeId].next = first_free_bnode; |
---|
1107 | first_free_bnode = bNodeId; |
---|
1108 | } |
---|
1109 | } |
---|
1110 | |
---|
1111 | void erase(const UEdge& edge) { |
---|
1112 | |
---|
1113 | if (edges[edge.id].prev_out != -1) { |
---|
1114 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
1115 | } else { |
---|
1116 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
1117 | } |
---|
1118 | if (edges[edge.id].next_out != -1) { |
---|
1119 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
1120 | } |
---|
1121 | |
---|
1122 | if (edges[edge.id].prev_in != -1) { |
---|
1123 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
1124 | } else { |
---|
1125 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
1126 | } |
---|
1127 | if (edges[edge.id].next_in != -1) { |
---|
1128 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
1129 | } |
---|
1130 | |
---|
1131 | edges[edge.id].next_out = first_free_edge; |
---|
1132 | first_free_edge = edge.id; |
---|
1133 | } |
---|
1134 | |
---|
1135 | void clear() { |
---|
1136 | aNodes.clear(); |
---|
1137 | bNodes.clear(); |
---|
1138 | edges.clear(); |
---|
1139 | first_anode = -1; |
---|
1140 | first_free_anode = -1; |
---|
1141 | first_bnode = -1; |
---|
1142 | first_free_bnode = -1; |
---|
1143 | first_free_edge = -1; |
---|
1144 | } |
---|
1145 | |
---|
1146 | }; |
---|
1147 | |
---|
1148 | |
---|
1149 | typedef BpUGraphExtender< ListBpUGraphBase > ExtendedListBpUGraphBase; |
---|
1150 | |
---|
1151 | /// \ingroup graphs |
---|
1152 | /// |
---|
1153 | /// \brief A smart bipartite undirected graph class. |
---|
1154 | /// |
---|
1155 | /// This is a bipartite undirected graph implementation. |
---|
1156 | /// It is conforms to the \ref concept::BpUGraph "BpUGraph concept". |
---|
1157 | /// \sa concept::BpUGraph. |
---|
1158 | /// |
---|
1159 | class ListBpUGraph : public ExtendedListBpUGraphBase {}; |
---|
1160 | |
---|
1161 | |
---|
1162 | /// @} |
---|
1163 | } //namespace lemon |
---|
1164 | |
---|
1165 | |
---|
1166 | #endif |
---|