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) 2003-2008 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_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 <lemon/maps.h> |
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26 | #include <lemon/error.h> |
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27 | |
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28 | /// \ingroup dimacs_group |
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29 | /// \file |
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30 | /// \brief DIMACS file format reader. |
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31 | |
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32 | namespace lemon { |
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33 | |
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34 | /// \addtogroup dimacs_group |
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35 | /// @{ |
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36 | |
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37 | /// DIMACS file type descriptor. |
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38 | struct DimacsDescriptor |
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39 | { |
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40 | ///File type enum |
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41 | enum Type |
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42 | { |
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43 | NONE, MIN, MAX, SP, MAT |
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44 | }; |
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45 | ///The file type |
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46 | Type type; |
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47 | ///The number of nodes in the graph |
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48 | int nodeNum; |
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49 | ///The number of edges in the graph |
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50 | int edgeNum; |
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51 | int lineShift; |
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52 | /// Constructor. Sets the type to NONE. |
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53 | DimacsDescriptor() : type(NONE) {} |
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54 | }; |
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55 | |
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56 | ///Discover the type of a DIMACS file |
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57 | |
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58 | ///It starts seeking the begining of the file for the problem type |
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59 | ///and size info. The found data is returned in a special struct |
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60 | ///that can be evaluated and passed to the appropriate reader |
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61 | ///function. |
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62 | DimacsDescriptor dimacsType(std::istream& is) |
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63 | { |
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64 | DimacsDescriptor r; |
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65 | std::string problem,str; |
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66 | char c; |
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67 | r.lineShift=0; |
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68 | while (is >> c) |
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69 | switch(c) |
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70 | { |
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71 | case 'p': |
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72 | if(is >> problem >> r.nodeNum >> r.edgeNum) |
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73 | { |
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74 | getline(is, str); |
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75 | r.lineShift++; |
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76 | if(problem=="min") r.type=DimacsDescriptor::MIN; |
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77 | else if(problem=="max") r.type=DimacsDescriptor::MAX; |
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78 | else if(problem=="sp") r.type=DimacsDescriptor::SP; |
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79 | else if(problem=="mat") r.type=DimacsDescriptor::MAT; |
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80 | else throw FormatError("Unknown problem type"); |
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81 | return r; |
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82 | } |
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83 | else |
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84 | { |
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85 | throw FormatError("Missing or wrong problem type declaration."); |
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86 | } |
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87 | break; |
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88 | case 'c': |
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89 | getline(is, str); |
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90 | r.lineShift++; |
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91 | break; |
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92 | default: |
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93 | throw FormatError("Unknown DIMACS declaration."); |
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94 | } |
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95 | throw FormatError("Missing problem type declaration."); |
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96 | } |
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97 | |
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98 | |
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99 | |
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100 | /// DIMACS minimum cost flow reader function. |
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101 | /// |
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102 | /// This function reads a minimum cost flow instance from DIMACS format, |
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103 | /// i.e. from a DIMACS file having a line starting with |
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104 | /// \code |
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105 | /// p min |
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106 | /// \endcode |
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107 | /// At the beginning, \c g is cleared by \c g.clear(). The supply |
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108 | /// amount of the nodes are written to \c supply (signed). The |
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109 | /// lower bounds, capacities and costs of the arcs are written to |
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110 | /// \c lower, \c capacity and \c cost. |
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111 | /// |
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112 | /// If the file type was previously evaluated by dimacsType(), then |
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113 | /// the descriptor struct should be given by the \c dest parameter. |
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114 | template <typename Digraph, typename LowerMap, |
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115 | typename CapacityMap, typename CostMap, |
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116 | typename SupplyMap> |
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117 | void readDimacsMin(std::istream& is, |
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118 | Digraph &g, |
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119 | LowerMap& lower, |
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120 | CapacityMap& capacity, |
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121 | CostMap& cost, |
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122 | SupplyMap& supply, |
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123 | DimacsDescriptor desc=DimacsDescriptor()) |
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124 | { |
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125 | g.clear(); |
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126 | std::vector<typename Digraph::Node> nodes; |
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127 | typename Digraph::Arc e; |
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128 | std::string problem, str; |
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129 | char c; |
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130 | int i, j; |
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131 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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132 | if(desc.type!=DimacsDescriptor::MIN) |
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133 | throw FormatError("Problem type mismatch"); |
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134 | |
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135 | nodes.resize(desc.nodeNum + 1); |
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136 | for (int k = 1; k <= desc.nodeNum; ++k) { |
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137 | nodes[k] = g.addNode(); |
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138 | supply.set(nodes[k], 0); |
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139 | } |
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140 | |
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141 | typename SupplyMap::Value sup; |
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142 | typename CapacityMap::Value low; |
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143 | typename CapacityMap::Value cap; |
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144 | typename CostMap::Value co; |
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145 | while (is >> c) { |
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146 | switch (c) { |
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147 | case 'c': // comment line |
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148 | getline(is, str); |
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149 | break; |
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150 | case 'n': // node definition line |
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151 | is >> i >> sup; |
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152 | getline(is, str); |
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153 | supply.set(nodes[i], sup); |
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154 | break; |
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155 | case 'a': // arc (arc) definition line |
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156 | is >> i >> j >> low >> cap >> co; |
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157 | getline(is, str); |
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158 | e = g.addArc(nodes[i], nodes[j]); |
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159 | lower.set(e, low); |
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160 | if (cap >= 0) |
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161 | capacity.set(e, cap); |
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162 | else |
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163 | capacity.set(e, -1); |
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164 | cost.set(e, co); |
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165 | break; |
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166 | } |
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167 | } |
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168 | } |
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169 | |
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170 | template<typename Digraph, typename CapacityMap> |
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171 | void _readDimacs(std::istream& is, |
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172 | Digraph &g, |
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173 | CapacityMap& capacity, |
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174 | typename Digraph::Node &s, |
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175 | typename Digraph::Node &t, |
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176 | DimacsDescriptor desc=DimacsDescriptor()) { |
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177 | g.clear(); |
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178 | s=t=INVALID; |
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179 | std::vector<typename Digraph::Node> nodes; |
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180 | typename Digraph::Arc e; |
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181 | char c, d; |
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182 | int i, j; |
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183 | typename CapacityMap::Value _cap; |
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184 | std::string str; |
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185 | nodes.resize(desc.nodeNum + 1); |
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186 | for (int k = 1; k <= desc.nodeNum; ++k) { |
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187 | nodes[k] = g.addNode(); |
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188 | } |
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189 | |
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190 | while (is >> c) { |
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191 | switch (c) { |
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192 | case 'c': // comment line |
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193 | getline(is, str); |
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194 | break; |
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195 | case 'n': // node definition line |
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196 | if (desc.type==DimacsDescriptor::SP) { // shortest path problem |
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197 | is >> i; |
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198 | getline(is, str); |
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199 | s = nodes[i]; |
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200 | } |
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201 | if (desc.type==DimacsDescriptor::MAX) { // max flow problem |
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202 | is >> i >> d; |
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203 | getline(is, str); |
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204 | if (d == 's') s = nodes[i]; |
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205 | if (d == 't') t = nodes[i]; |
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206 | } |
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207 | break; |
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208 | case 'a': // arc (arc) definition line |
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209 | if (desc.type==DimacsDescriptor::SP || |
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210 | desc.type==DimacsDescriptor::MAX) { |
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211 | is >> i >> j >> _cap; |
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212 | getline(is, str); |
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213 | e = g.addArc(nodes[i], nodes[j]); |
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214 | capacity.set(e, _cap); |
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215 | } else { |
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216 | is >> i >> j; |
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217 | getline(is, str); |
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218 | g.addArc(nodes[i], nodes[j]); |
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219 | } |
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220 | break; |
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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 | /// DIMACS maximum flow reader function. |
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226 | /// |
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227 | /// This function reads a maximum flow instance from DIMACS format, |
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228 | /// i.e. from a DIMACS file having a line starting with |
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229 | /// \code |
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230 | /// p max |
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231 | /// \endcode |
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232 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
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233 | /// capacities are written to \c capacity and \c s and \c t are |
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234 | /// set to the source and the target nodes. |
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235 | /// |
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236 | /// If the file type was previously evaluated by dimacsType(), then |
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237 | /// the descriptor struct should be given by the \c dest parameter. |
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238 | template<typename Digraph, typename CapacityMap> |
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239 | void readDimacsMax(std::istream& is, |
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240 | Digraph &g, |
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241 | CapacityMap& capacity, |
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242 | typename Digraph::Node &s, |
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243 | typename Digraph::Node &t, |
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244 | DimacsDescriptor desc=DimacsDescriptor()) { |
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245 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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246 | if(desc.type!=DimacsDescriptor::MAX) |
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247 | throw FormatError("Problem type mismatch"); |
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248 | _readDimacs(is,g,capacity,s,t,desc); |
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249 | } |
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250 | |
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251 | /// DIMACS shortest path reader function. |
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252 | /// |
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253 | /// This function reads a shortest path instance from DIMACS format, |
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254 | /// i.e. from a DIMACS file having a line starting with |
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255 | /// \code |
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256 | /// p sp |
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257 | /// \endcode |
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258 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
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259 | /// lengths are written to \c length and \c s is set to the |
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260 | /// source node. |
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261 | /// |
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262 | /// If the file type was previously evaluated by dimacsType(), then |
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263 | /// the descriptor struct should be given by the \c dest parameter. |
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264 | template<typename Digraph, typename LengthMap> |
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265 | void readDimacsSp(std::istream& is, |
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266 | Digraph &g, |
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267 | LengthMap& length, |
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268 | typename Digraph::Node &s, |
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269 | DimacsDescriptor desc=DimacsDescriptor()) { |
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270 | typename Digraph::Node t; |
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271 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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272 | if(desc.type!=DimacsDescriptor::SP) |
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273 | throw FormatError("Problem type mismatch"); |
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274 | _readDimacs(is, g, length, s, t,desc); |
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275 | } |
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276 | |
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277 | /// DIMACS capacitated digraph reader function. |
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278 | /// |
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279 | /// This function reads an arc capacitated digraph instance from |
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280 | /// DIMACS 'mat' or 'sp' format. |
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281 | /// At the beginning, \c g is cleared by \c g.clear() |
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282 | /// and the arc capacities/lengths are written to \c capacity. |
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283 | /// |
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284 | /// If the file type was previously evaluated by dimacsType(), then |
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285 | /// the descriptor struct should be given by the \c dest parameter. |
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286 | template<typename Digraph, typename CapacityMap> |
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287 | void readDimacsCap(std::istream& is, |
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288 | Digraph &g, |
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289 | CapacityMap& capacity, |
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290 | DimacsDescriptor desc=DimacsDescriptor()) { |
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291 | typename Digraph::Node u,v; |
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292 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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293 | if(desc.type!=DimacsDescriptor::MAX || desc.type!=DimacsDescriptor::SP) |
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294 | throw FormatError("Problem type mismatch"); |
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295 | _readDimacs(is, g, capacity, u, v, desc); |
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296 | } |
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297 | |
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298 | /// DIMACS plain digraph reader function. |
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299 | /// |
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300 | /// This function reads a digraph without any designated nodes and |
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301 | /// maps from DIMACS format, i.e. from DIMACS files having a line |
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302 | /// starting with |
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303 | /// \code |
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304 | /// p mat |
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305 | /// \endcode |
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306 | /// At the beginning, \c g is cleared by \c g.clear(). |
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307 | /// |
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308 | /// If the file type was previously evaluated by dimacsType(), then |
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309 | /// the descriptor struct should be given by the \c dest parameter. |
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310 | template<typename Digraph> |
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311 | void readDimacsMat(std::istream& is, Digraph &g, |
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312 | DimacsDescriptor desc=DimacsDescriptor()) { |
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313 | typename Digraph::Node u,v; |
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314 | NullMap<typename Digraph::Arc, int> n; |
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315 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
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316 | if(desc.type!=DimacsDescriptor::MAT) |
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317 | throw FormatError("Problem type mismatch"); |
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318 | _readDimacs(is, g, n, u, v, desc); |
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319 | } |
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320 | |
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321 | /// DIMACS plain digraph writer function. |
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322 | /// |
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323 | /// This function writes a digraph without any designated nodes and |
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324 | /// maps into DIMACS format, i.e. into DIMACS file having a line |
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325 | /// starting with |
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326 | /// \code |
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327 | /// p mat |
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328 | /// \endcode |
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329 | /// If \c comment is not empty, then it will be printed in the first line |
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330 | /// prefixed by 'c'. |
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331 | template<typename Digraph> |
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332 | void writeDimacsMat(std::ostream& os, const Digraph &g, |
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333 | std::string comment="") { |
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334 | typedef typename Digraph::NodeIt NodeIt; |
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335 | typedef typename Digraph::ArcIt ArcIt; |
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336 | |
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337 | if(!comment.empty()) |
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338 | os << "c " << comment << std::endl; |
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339 | os << "p mat " << g.nodeNum() << " " << g.arcNum() << std::endl; |
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340 | |
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341 | typename Digraph::template NodeMap<int> nodes(g); |
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342 | int i = 1; |
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343 | for(NodeIt v(g); v != INVALID; ++v) { |
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344 | nodes.set(v, i); |
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345 | ++i; |
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346 | } |
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347 | for(ArcIt e(g); e != INVALID; ++e) { |
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348 | os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] |
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349 | << std::endl; |
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350 | } |
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351 | } |
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352 | |
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353 | /// @} |
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354 | |
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355 | } //namespace lemon |
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356 | |
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357 | #endif //LEMON_DIMACS_H |
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