1 | /* -*- C++ -*- |
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2 | * lemon/dimacs.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2006 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_DIMACS_H |
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18 | #define LEMON_DIMACS_H |
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19 | |
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20 | #include <iostream> |
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21 | #include <string> |
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22 | #include <vector> |
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23 | #include <lemon/maps.h> |
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24 | #include <lemon/invalid.h> |
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25 | |
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26 | /// \ingroup dimacs_group |
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27 | /// \file |
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28 | /// \brief Dimacs file format reader. |
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29 | |
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30 | namespace lemon { |
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31 | |
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32 | /// |
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33 | ///@defgroup dimacs_group DIMACS format |
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34 | ///\brief Read and write files in DIMACS format |
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35 | /// |
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36 | ///Tools to read a graph from or write it to a file in DIMACS format |
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37 | ///data |
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38 | ///\ingroup io_group |
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39 | |
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40 | /// \addtogroup dimacs_group |
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41 | /// @{ |
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42 | |
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43 | /// Dimacs min cost flow reader function. |
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44 | |
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45 | /// This function reads a min cost flow instance from dimacs format, |
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46 | /// i.e. from dimacs files having a line starting with |
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47 | ///\code |
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48 | /// p "min" |
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49 | ///\endcode |
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50 | /// At the beginning \c g is cleared by \c g.clear(). The edge |
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51 | /// capacities are written to \c capacity, \c s and \c t are set to |
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52 | /// the source and the target nodes resp. and the cost of the edges |
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53 | /// are written to \c cost. |
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54 | /// |
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55 | /// \author Marton Makai |
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56 | template<typename Graph, typename CapacityMap, typename CostMap> |
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57 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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58 | typename Graph::Node &s, typename Graph::Node &t, |
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59 | CostMap& cost) { |
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60 | g.clear(); |
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61 | typename CapacityMap::Value _cap; |
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62 | typename CostMap::Value _cost; |
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63 | char d; |
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64 | std::string problem; |
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65 | char c; |
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66 | int i, j; |
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67 | std::string str; |
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68 | int n, m; |
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69 | typename Graph::Edge e; |
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70 | std::vector<typename Graph::Node> nodes; |
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71 | while (is>>c) { |
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72 | switch (c) { |
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73 | case 'c': //comment |
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74 | getline(is, str); |
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75 | break; |
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76 | case 'p': //problem definition |
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77 | is >> problem >> n >> m; |
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78 | getline(is, str); |
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79 | nodes.resize(n+1); |
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80 | for (int k=1; k<=n; ++k) nodes[k]=g.addNode(); |
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81 | break; |
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82 | case 'n': //node definition |
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83 | if (problem=="sp") { //shortest path problem |
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84 | is >> i; |
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85 | getline(is, str); |
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86 | s=nodes[i]; |
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87 | } |
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88 | if (problem=="max" || problem=="min") { //((max) or (min cost)) flow problem |
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89 | is >> i >> d; |
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90 | getline(is, str); |
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91 | if (d=='s') s=nodes[i]; |
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92 | if (d=='t') t=nodes[i]; |
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93 | } |
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94 | break; |
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95 | case 'a': |
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96 | if ( problem == "max" || problem == "sp") { |
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97 | is >> i >> j >> _cap; |
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98 | getline(is, str); |
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99 | e=g.addEdge(nodes[i], nodes[j]); |
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100 | //capacity.update(); |
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101 | capacity.set(e, _cap); |
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102 | } else { |
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103 | if ( problem == "min" ) { |
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104 | is >> i >> j >> _cap >> _cost; |
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105 | getline(is, str); |
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106 | e=g.addEdge(nodes[i], nodes[j]); |
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107 | //capacity.update(); |
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108 | capacity.set(e, _cap); |
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109 | //cost.update(); |
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110 | cost.set(e, _cost); |
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111 | } else { |
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112 | is >> i >> j; |
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113 | getline(is, str); |
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114 | g.addEdge(nodes[i], nodes[j]); |
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115 | } |
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116 | } |
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117 | break; |
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118 | } |
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119 | } |
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120 | } |
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121 | |
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122 | |
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123 | /// Dimacs max flow reader function. |
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124 | |
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125 | /// This function reads a max flow instance from dimacs format, |
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126 | /// i.e. from dimacs files having a line starting with |
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127 | ///\code |
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128 | /// p "max" |
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129 | ///\endcode |
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130 | ///At the beginning \c g is cleared by \c g.clear(). The |
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131 | /// edge capacities are written to \c capacity and \c s and \c t are |
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132 | /// set to the source and the target nodes. |
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133 | /// |
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134 | /// \author Marton Makai |
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135 | template<typename Graph, typename CapacityMap> |
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136 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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137 | typename Graph::Node &s, typename Graph::Node &t) { |
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138 | NullMap<typename Graph::Edge, int> n; |
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139 | readDimacs(is, g, capacity, s, t, n); |
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140 | } |
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141 | |
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142 | |
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143 | /// Dimacs shortest path reader function. |
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144 | |
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145 | /// This function reads a shortest path instance from dimacs format, |
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146 | /// i.e. from dimacs files having a line starting with |
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147 | ///\code |
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148 | /// p "sp" |
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149 | ///\endcode |
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150 | /// At the beginning \c g is cleared by \c g.clear(). The edge |
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151 | /// capacities are written to \c capacity and \c s is set to the |
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152 | /// source node. |
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153 | /// |
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154 | /// \author Marton Makai |
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155 | template<typename Graph, typename CapacityMap> |
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156 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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157 | typename Graph::Node &s) { |
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158 | NullMap<typename Graph::Edge, int> n; |
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159 | readDimacs(is, g, capacity, s, s, n); |
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160 | } |
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161 | |
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162 | |
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163 | /// Dimacs capacitated graph reader function. |
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164 | |
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165 | /// This function reads an edge capacitated graph instance from |
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166 | /// dimacs format. At the beginning \c g is cleared by \c g.clear() |
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167 | /// and the edge capacities are written to \c capacity. |
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168 | /// |
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169 | /// \author Marton Makai |
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170 | template<typename Graph, typename CapacityMap> |
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171 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity) { |
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172 | typename Graph::Node u; |
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173 | NullMap<typename Graph::Edge, int> n; |
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174 | readDimacs(is, g, capacity, u, u, n); |
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175 | } |
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176 | |
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177 | |
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178 | /// Dimacs plain graph reader function. |
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179 | |
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180 | /// This function reads a graph without any designated nodes and |
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181 | /// maps from dimacs format, i.e. from dimacs files having a line |
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182 | /// starting with |
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183 | ///\code |
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184 | /// p "mat" |
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185 | ///\endcode |
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186 | /// At the beginning \c g is cleared |
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187 | /// by \c g.clear(). |
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188 | /// |
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189 | /// \author Marton Makai |
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190 | template<typename Graph> |
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191 | void readDimacs(std::istream& is, Graph &g) { |
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192 | typename Graph::Node u; |
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193 | NullMap<typename Graph::Edge, int> n; |
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194 | readDimacs(is, g, n, u, u, n); |
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195 | } |
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196 | |
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197 | |
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198 | |
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199 | |
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200 | /// write matching problem |
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201 | template<typename Graph> |
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202 | void writeDimacs(std::ostream& os, const Graph &g) { |
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203 | typedef typename Graph::NodeIt NodeIt; |
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204 | typedef typename Graph::EdgeIt EdgeIt; |
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205 | |
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206 | typename Graph::template NodeMap<int> nodes(g); |
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207 | |
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208 | os << "c matching problem" << std::endl; |
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209 | |
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210 | int i=1; |
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211 | for(NodeIt v(g); v!=INVALID; ++v) { |
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212 | nodes.set(v, i); |
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213 | ++i; |
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214 | } |
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215 | |
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216 | os << "p mat " << g.nodeNum() << " " << g.edgeNum() << std::endl; |
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217 | |
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218 | for(EdgeIt e(g); e!=INVALID; ++e) { |
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219 | os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] << std::endl; |
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220 | } |
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221 | |
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222 | } |
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223 | |
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224 | /// @} |
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225 | |
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226 | } //namespace lemon |
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227 | |
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228 | #endif //LEMON_DIMACS_H |
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