1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library. |
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4 | * |
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5 | * Copyright (C) 2003-2010 |
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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_DIMACS_H |
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20 | #define LEMON_DIMACS_H |
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21 | |
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22 | #include <iostream> |
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23 | #include <string> |
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24 | #include <vector> |
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25 | #include <limits> |
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26 | #include <lemon/maps.h> |
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27 | #include <lemon/error.h> |
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28 | |
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29 | /// \ingroup dimacs_group |
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30 | /// \file |
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31 | /// \brief DIMACS file format reader. |
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32 | |
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33 | namespace lemon { |
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34 | |
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35 | /// \addtogroup dimacs_group |
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36 | /// @{ |
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37 | |
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38 | /// DIMACS file type descriptor. |
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39 | struct DimacsDescriptor |
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40 | { |
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41 | ///\brief DIMACS file type enum |
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42 | /// |
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43 | ///DIMACS file type enum. |
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44 | enum Type { |
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45 | NONE, ///< Undefined type. |
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46 | MIN, ///< DIMACS file type for minimum cost flow problems. |
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47 | MAX, ///< DIMACS file type for maximum flow problems. |
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48 | SP, ///< DIMACS file type for shostest path problems. |
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49 | MAT ///< DIMACS file type for plain graphs and matching problems. |
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50 | }; |
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51 | ///The file type |
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52 | Type type; |
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53 | ///The number of nodes in the graph |
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54 | int nodeNum; |
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55 | ///The number of edges in the graph |
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56 | int edgeNum; |
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57 | int lineShift; |
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58 | ///Constructor. It sets the type to \c NONE. |
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59 | DimacsDescriptor() : type(NONE) {} |
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60 | }; |
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61 | |
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62 | ///Discover the type of a DIMACS file |
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63 | |
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64 | ///This function starts seeking the beginning of the given file for the |
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65 | ///problem type and size info. |
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66 | ///The found data is returned in a special struct that can be evaluated |
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67 | ///and passed to the appropriate reader function. |
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68 | DimacsDescriptor dimacsType(std::istream& is) |
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69 | { |
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70 | DimacsDescriptor r; |
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71 | std::string problem,str; |
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72 | char c; |
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73 | r.lineShift=0; |
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74 | while (is >> c) |
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75 | switch(c) |
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76 | { |
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77 | case 'p': |
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78 | if(is >> problem >> r.nodeNum >> r.edgeNum) |
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79 | { |
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80 | getline(is, str); |
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81 | r.lineShift++; |
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82 | if(problem=="min") r.type=DimacsDescriptor::MIN; |
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83 | else if(problem=="max") r.type=DimacsDescriptor::MAX; |
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84 | else if(problem=="sp") r.type=DimacsDescriptor::SP; |
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85 | else if(problem=="mat") r.type=DimacsDescriptor::MAT; |
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86 | else throw FormatError("Unknown problem type"); |
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87 | return r; |
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88 | } |
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89 | else |
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90 | { |
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91 | throw FormatError("Missing or wrong problem type declaration."); |
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92 | } |
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93 | break; |
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94 | case 'c': |
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95 | getline(is, str); |
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96 | r.lineShift++; |
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97 | break; |
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98 | default: |
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99 | throw FormatError("Unknown DIMACS declaration."); |
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100 | } |
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101 | throw FormatError("Missing problem type declaration."); |
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102 | } |
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103 | |
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104 | |
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105 | /// \brief DIMACS minimum cost flow reader function. |
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106 | /// |
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107 | /// This function reads a minimum cost flow instance from DIMACS format, |
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108 | /// i.e. from a DIMACS file having a line starting with |
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109 | /// \code |
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110 | /// p min |
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111 | /// \endcode |
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112 | /// At the beginning, \c g is cleared by \c g.clear(). The supply |
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113 | /// amount of the nodes are written to the \c supply node map |
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114 | /// (they are signed values). The lower bounds, capacities and costs |
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115 | /// of the arcs are written to the \c lower, \c capacity and \c cost |
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116 | /// arc maps. |
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117 | /// |
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118 | /// If the capacity of an arc is less than the lower bound, it will |
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119 | /// be set to "infinite" instead. The actual value of "infinite" is |
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120 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
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121 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
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122 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
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123 | /// a non-zero value, that value will be used as "infinite". |
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124 | /// |
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125 | /// If the file type was previously evaluated by dimacsType(), then |
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126 | /// the descriptor struct should be given by the \c desc parameter. |
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127 | template <typename Digraph, typename LowerMap, |
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128 | typename CapacityMap, typename CostMap, |
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129 | typename SupplyMap> |
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130 | void readDimacsMin(std::istream& is, |
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131 | Digraph &g, |
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132 | LowerMap& lower, |
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133 | CapacityMap& capacity, |
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134 | CostMap& cost, |
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135 | SupplyMap& supply, |
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136 | typename CapacityMap::Value infty = 0, |
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137 | DimacsDescriptor desc=DimacsDescriptor()) |
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138 | { |
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139 | g.clear(); |
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140 | std::vector<typename Digraph::Node> nodes; |
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141 | typename Digraph::Arc e; |
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142 | std::string problem, str; |
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143 | char c; |
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144 | int i, j; |
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145 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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146 | if(desc.type!=DimacsDescriptor::MIN) |
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147 | throw FormatError("Problem type mismatch"); |
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148 | |
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149 | nodes.resize(desc.nodeNum + 1); |
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150 | for (int k = 1; k <= desc.nodeNum; ++k) { |
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151 | nodes[k] = g.addNode(); |
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152 | supply.set(nodes[k], 0); |
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153 | } |
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154 | |
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155 | typename SupplyMap::Value sup; |
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156 | typename CapacityMap::Value low; |
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157 | typename CapacityMap::Value cap; |
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158 | typename CostMap::Value co; |
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159 | typedef typename CapacityMap::Value Capacity; |
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160 | if(infty==0) |
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161 | infty = std::numeric_limits<Capacity>::has_infinity ? |
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162 | std::numeric_limits<Capacity>::infinity() : |
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163 | std::numeric_limits<Capacity>::max(); |
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164 | |
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165 | while (is >> c) { |
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166 | switch (c) { |
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167 | case 'c': // comment line |
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168 | getline(is, str); |
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169 | break; |
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170 | case 'n': // node definition line |
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171 | is >> i >> sup; |
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172 | getline(is, str); |
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173 | supply.set(nodes[i], sup); |
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174 | break; |
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175 | case 'a': // arc definition line |
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176 | is >> i >> j >> low >> cap >> co; |
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177 | getline(is, str); |
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178 | e = g.addArc(nodes[i], nodes[j]); |
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179 | lower.set(e, low); |
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180 | if (cap >= low) |
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181 | capacity.set(e, cap); |
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182 | else |
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183 | capacity.set(e, infty); |
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184 | cost.set(e, co); |
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185 | break; |
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186 | } |
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187 | } |
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188 | } |
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189 | |
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190 | template<typename Digraph, typename CapacityMap> |
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191 | void _readDimacs(std::istream& is, |
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192 | Digraph &g, |
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193 | CapacityMap& capacity, |
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194 | typename Digraph::Node &s, |
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195 | typename Digraph::Node &t, |
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196 | typename CapacityMap::Value infty = 0, |
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197 | DimacsDescriptor desc=DimacsDescriptor()) { |
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198 | g.clear(); |
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199 | s=t=INVALID; |
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200 | std::vector<typename Digraph::Node> nodes; |
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201 | typename Digraph::Arc e; |
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202 | char c, d; |
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203 | int i, j; |
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204 | typename CapacityMap::Value _cap; |
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205 | std::string str; |
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206 | nodes.resize(desc.nodeNum + 1); |
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207 | for (int k = 1; k <= desc.nodeNum; ++k) { |
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208 | nodes[k] = g.addNode(); |
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209 | } |
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210 | typedef typename CapacityMap::Value Capacity; |
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211 | |
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212 | if(infty==0) |
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213 | infty = std::numeric_limits<Capacity>::has_infinity ? |
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214 | std::numeric_limits<Capacity>::infinity() : |
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215 | std::numeric_limits<Capacity>::max(); |
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216 | |
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217 | while (is >> c) { |
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218 | switch (c) { |
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219 | case 'c': // comment line |
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220 | getline(is, str); |
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221 | break; |
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222 | case 'n': // node definition line |
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223 | if (desc.type==DimacsDescriptor::SP) { // shortest path problem |
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224 | is >> i; |
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225 | getline(is, str); |
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226 | s = nodes[i]; |
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227 | } |
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228 | if (desc.type==DimacsDescriptor::MAX) { // max flow problem |
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229 | is >> i >> d; |
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230 | getline(is, str); |
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231 | if (d == 's') s = nodes[i]; |
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232 | if (d == 't') t = nodes[i]; |
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233 | } |
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234 | break; |
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235 | case 'a': // arc definition line |
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236 | if (desc.type==DimacsDescriptor::SP) { |
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237 | is >> i >> j >> _cap; |
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238 | getline(is, str); |
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239 | e = g.addArc(nodes[i], nodes[j]); |
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240 | capacity.set(e, _cap); |
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241 | } |
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242 | else if (desc.type==DimacsDescriptor::MAX) { |
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243 | is >> i >> j >> _cap; |
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244 | getline(is, str); |
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245 | e = g.addArc(nodes[i], nodes[j]); |
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246 | if (_cap >= 0) |
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247 | capacity.set(e, _cap); |
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248 | else |
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249 | capacity.set(e, infty); |
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250 | } |
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251 | else { |
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252 | is >> i >> j; |
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253 | getline(is, str); |
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254 | g.addArc(nodes[i], nodes[j]); |
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255 | } |
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256 | break; |
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257 | } |
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258 | } |
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259 | } |
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260 | |
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261 | /// \brief DIMACS maximum flow reader function. |
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262 | /// |
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263 | /// This function reads a maximum flow instance from DIMACS format, |
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264 | /// i.e. from a DIMACS file having a line starting with |
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265 | /// \code |
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266 | /// p max |
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267 | /// \endcode |
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268 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
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269 | /// capacities are written to the \c capacity arc map and \c s and |
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270 | /// \c t are set to the source and the target nodes. |
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271 | /// |
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272 | /// If the capacity of an arc is negative, it will |
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273 | /// be set to "infinite" instead. The actual value of "infinite" is |
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274 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
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275 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
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276 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
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277 | /// a non-zero value, that value will be used as "infinite". |
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278 | /// |
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279 | /// If the file type was previously evaluated by dimacsType(), then |
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280 | /// the descriptor struct should be given by the \c desc parameter. |
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281 | template<typename Digraph, typename CapacityMap> |
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282 | void readDimacsMax(std::istream& is, |
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283 | Digraph &g, |
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284 | CapacityMap& capacity, |
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285 | typename Digraph::Node &s, |
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286 | typename Digraph::Node &t, |
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287 | typename CapacityMap::Value infty = 0, |
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288 | DimacsDescriptor desc=DimacsDescriptor()) { |
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289 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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290 | if(desc.type!=DimacsDescriptor::MAX) |
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291 | throw FormatError("Problem type mismatch"); |
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292 | _readDimacs(is,g,capacity,s,t,infty,desc); |
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293 | } |
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294 | |
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295 | /// \brief DIMACS shortest path reader function. |
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296 | /// |
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297 | /// This function reads a shortest path instance from DIMACS format, |
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298 | /// i.e. from a DIMACS file having a line starting with |
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299 | /// \code |
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300 | /// p sp |
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301 | /// \endcode |
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302 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
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303 | /// lengths are written to the \c length arc map and \c s is set to the |
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304 | /// source node. |
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305 | /// |
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306 | /// If the file type was previously evaluated by dimacsType(), then |
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307 | /// the descriptor struct should be given by the \c desc parameter. |
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308 | template<typename Digraph, typename LengthMap> |
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309 | void readDimacsSp(std::istream& is, |
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310 | Digraph &g, |
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311 | LengthMap& length, |
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312 | typename Digraph::Node &s, |
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313 | DimacsDescriptor desc=DimacsDescriptor()) { |
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314 | typename Digraph::Node t; |
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315 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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316 | if(desc.type!=DimacsDescriptor::SP) |
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317 | throw FormatError("Problem type mismatch"); |
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318 | _readDimacs(is, g, length, s, t, 0, desc); |
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319 | } |
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320 | |
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321 | /// \brief DIMACS capacitated digraph reader function. |
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322 | /// |
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323 | /// This function reads an arc capacitated digraph instance from |
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324 | /// DIMACS 'max' or 'sp' format. |
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325 | /// At the beginning, \c g is cleared by \c g.clear() |
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326 | /// and the arc capacities/lengths are written to the \c capacity |
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327 | /// arc map. |
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328 | /// |
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329 | /// In case of the 'max' format, if the capacity of an arc is negative, |
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330 | /// it will |
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331 | /// be set to "infinite" instead. The actual value of "infinite" is |
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332 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
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333 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
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334 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
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335 | /// a non-zero value, that value will be used as "infinite". |
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336 | /// |
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337 | /// If the file type was previously evaluated by dimacsType(), then |
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338 | /// the descriptor struct should be given by the \c desc parameter. |
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339 | template<typename Digraph, typename CapacityMap> |
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340 | void readDimacsCap(std::istream& is, |
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341 | Digraph &g, |
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342 | CapacityMap& capacity, |
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343 | typename CapacityMap::Value infty = 0, |
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344 | DimacsDescriptor desc=DimacsDescriptor()) { |
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345 | typename Digraph::Node u,v; |
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346 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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347 | if(desc.type!=DimacsDescriptor::MAX && desc.type!=DimacsDescriptor::SP) |
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348 | throw FormatError("Problem type mismatch"); |
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349 | _readDimacs(is, g, capacity, u, v, infty, desc); |
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350 | } |
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351 | |
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352 | template<typename Graph> |
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353 | typename enable_if<lemon::UndirectedTagIndicator<Graph>,void>::type |
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354 | _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t, |
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355 | dummy<0> = 0) |
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356 | { |
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357 | g.addEdge(s,t); |
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358 | } |
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359 | template<typename Graph> |
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360 | typename disable_if<lemon::UndirectedTagIndicator<Graph>,void>::type |
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361 | _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t, |
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362 | dummy<1> = 1) |
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363 | { |
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364 | g.addArc(s,t); |
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365 | } |
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366 | |
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367 | /// \brief DIMACS plain (di)graph reader function. |
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368 | /// |
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369 | /// This function reads a plain (di)graph without any designated nodes |
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370 | /// and maps (e.g. a matching instance) from DIMACS format, i.e. from |
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371 | /// DIMACS files having a line starting with |
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372 | /// \code |
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373 | /// p mat |
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374 | /// \endcode |
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375 | /// At the beginning, \c g is cleared by \c g.clear(). |
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376 | /// |
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377 | /// If the file type was previously evaluated by dimacsType(), then |
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378 | /// the descriptor struct should be given by the \c desc parameter. |
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379 | template<typename Graph> |
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380 | void readDimacsMat(std::istream& is, Graph &g, |
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381 | DimacsDescriptor desc=DimacsDescriptor()) |
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382 | { |
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383 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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384 | if(desc.type!=DimacsDescriptor::MAT) |
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385 | throw FormatError("Problem type mismatch"); |
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386 | |
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387 | g.clear(); |
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388 | std::vector<typename Graph::Node> nodes; |
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389 | char c; |
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390 | int i, j; |
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391 | std::string str; |
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392 | nodes.resize(desc.nodeNum + 1); |
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393 | for (int k = 1; k <= desc.nodeNum; ++k) { |
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394 | nodes[k] = g.addNode(); |
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395 | } |
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396 | |
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397 | while (is >> c) { |
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398 | switch (c) { |
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399 | case 'c': // comment line |
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400 | getline(is, str); |
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401 | break; |
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402 | case 'n': // node definition line |
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403 | break; |
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404 | case 'a': // arc definition line |
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405 | is >> i >> j; |
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406 | getline(is, str); |
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407 | _addArcEdge(g,nodes[i], nodes[j]); |
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408 | break; |
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409 | } |
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410 | } |
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411 | } |
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412 | |
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413 | /// DIMACS plain digraph writer function. |
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414 | /// |
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415 | /// This function writes a digraph without any designated nodes and |
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416 | /// maps into DIMACS format, i.e. into DIMACS file having a line |
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417 | /// starting with |
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418 | /// \code |
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419 | /// p mat |
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420 | /// \endcode |
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421 | /// If \c comment is not empty, then it will be printed in the first line |
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422 | /// prefixed by 'c'. |
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423 | template<typename Digraph> |
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424 | void writeDimacsMat(std::ostream& os, const Digraph &g, |
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425 | std::string comment="") { |
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426 | typedef typename Digraph::NodeIt NodeIt; |
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427 | typedef typename Digraph::ArcIt ArcIt; |
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428 | |
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429 | if(!comment.empty()) |
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430 | os << "c " << comment << std::endl; |
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431 | os << "p mat " << g.nodeNum() << " " << g.arcNum() << std::endl; |
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432 | |
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433 | typename Digraph::template NodeMap<int> nodes(g); |
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434 | int i = 1; |
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435 | for(NodeIt v(g); v != INVALID; ++v) { |
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436 | nodes.set(v, i); |
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437 | ++i; |
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438 | } |
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439 | for(ArcIt e(g); e != INVALID; ++e) { |
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440 | os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] |
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441 | << std::endl; |
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442 | } |
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443 | } |
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444 | |
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445 | /// @} |
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446 | |
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447 | } //namespace lemon |
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448 | |
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449 | #endif //LEMON_DIMACS_H |
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