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) 2003-2009 |
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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 | ///\ingroup tools |
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20 | ///\file |
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21 | ///\brief DIMACS problem solver. |
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22 | /// |
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23 | /// This program solves various problems given in DIMACS format. |
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24 | /// |
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25 | /// See |
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26 | /// \code |
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27 | /// dimacs-solver --help |
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28 | /// \endcode |
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29 | /// for more info on usage. |
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30 | |
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31 | #include <iostream> |
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32 | #include <fstream> |
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33 | #include <cstring> |
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34 | |
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35 | #include <lemon/smart_graph.h> |
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36 | #include <lemon/dimacs.h> |
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37 | #include <lemon/lgf_writer.h> |
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38 | #include <lemon/time_measure.h> |
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39 | |
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40 | #include <lemon/arg_parser.h> |
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41 | #include <lemon/error.h> |
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42 | |
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43 | #include <lemon/dijkstra.h> |
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44 | #include <lemon/preflow.h> |
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45 | #include <lemon/matching.h> |
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46 | #include <lemon/network_simplex.h> |
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47 | |
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48 | using namespace lemon; |
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49 | typedef SmartDigraph Digraph; |
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50 | DIGRAPH_TYPEDEFS(Digraph); |
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51 | typedef SmartGraph Graph; |
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52 | |
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53 | template<class Value> |
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54 | void solve_sp(ArgParser &ap, std::istream &is, std::ostream &, |
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55 | DimacsDescriptor &desc) |
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56 | { |
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57 | bool report = !ap.given("q"); |
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58 | Digraph g; |
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59 | Node s; |
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60 | Digraph::ArcMap<Value> len(g); |
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61 | Timer t; |
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62 | t.restart(); |
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63 | readDimacsSp(is, g, len, s, desc); |
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64 | if(report) std::cerr << "Read the file: " << t << '\n'; |
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65 | t.restart(); |
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66 | Dijkstra<Digraph, Digraph::ArcMap<Value> > dij(g,len); |
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67 | if(report) std::cerr << "Setup Dijkstra class: " << t << '\n'; |
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68 | t.restart(); |
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69 | dij.run(s); |
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70 | if(report) std::cerr << "Run Dijkstra: " << t << '\n'; |
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71 | } |
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72 | |
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73 | template<class Value> |
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74 | void solve_max(ArgParser &ap, std::istream &is, std::ostream &, |
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75 | Value infty, DimacsDescriptor &desc) |
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76 | { |
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77 | bool report = !ap.given("q"); |
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78 | Digraph g; |
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79 | Node s,t; |
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80 | Digraph::ArcMap<Value> cap(g); |
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81 | Timer ti; |
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82 | ti.restart(); |
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83 | readDimacsMax(is, g, cap, s, t, infty, desc); |
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84 | if(report) std::cerr << "Read the file: " << ti << '\n'; |
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85 | ti.restart(); |
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86 | Preflow<Digraph, Digraph::ArcMap<Value> > pre(g,cap,s,t); |
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87 | if(report) std::cerr << "Setup Preflow class: " << ti << '\n'; |
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88 | ti.restart(); |
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89 | pre.run(); |
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90 | if(report) std::cerr << "Run Preflow: " << ti << '\n'; |
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91 | if(report) std::cerr << "\nMax flow value: " << pre.flowValue() << '\n'; |
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92 | } |
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93 | |
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94 | template<class Value> |
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95 | void solve_min(ArgParser &ap, std::istream &is, std::ostream &, |
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96 | Value infty, DimacsDescriptor &desc) |
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97 | { |
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98 | bool report = !ap.given("q"); |
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99 | Digraph g; |
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100 | Digraph::ArcMap<Value> lower(g), cap(g), cost(g); |
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101 | Digraph::NodeMap<Value> sup(g); |
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102 | Timer ti; |
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103 | |
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104 | ti.restart(); |
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105 | readDimacsMin(is, g, lower, cap, cost, sup, infty, desc); |
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106 | ti.stop(); |
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107 | Value sum_sup = 0; |
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108 | for (Digraph::NodeIt n(g); n != INVALID; ++n) { |
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109 | sum_sup += sup[n]; |
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110 | } |
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111 | if (report) { |
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112 | std::cerr << "Sum of supply values: " << sum_sup << "\n"; |
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113 | if (sum_sup <= 0) |
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114 | std::cerr << "GEQ supply contraints are used for NetworkSimplex\n\n"; |
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115 | else |
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116 | std::cerr << "LEQ supply contraints are used for NetworkSimplex\n\n"; |
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117 | } |
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118 | if (report) std::cerr << "Read the file: " << ti << '\n'; |
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119 | |
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120 | ti.restart(); |
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121 | NetworkSimplex<Digraph, Value> ns(g); |
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122 | ns.lowerMap(lower).upperMap(cap).costMap(cost).supplyMap(sup); |
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123 | if (sum_sup > 0) ns.supplyType(ns.LEQ); |
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124 | if (report) std::cerr << "Setup NetworkSimplex class: " << ti << '\n'; |
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125 | ti.restart(); |
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126 | bool res = ns.run(); |
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127 | if (report) { |
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128 | std::cerr << "Run NetworkSimplex: " << ti << "\n\n"; |
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129 | std::cerr << "Feasible flow: " << (res ? "found" : "not found") << '\n'; |
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130 | if (res) std::cerr << "Min flow cost: " << ns.totalCost() << '\n'; |
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131 | } |
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132 | } |
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133 | |
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134 | void solve_mat(ArgParser &ap, std::istream &is, std::ostream &, |
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135 | DimacsDescriptor &desc) |
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136 | { |
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137 | bool report = !ap.given("q"); |
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138 | Graph g; |
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139 | Timer ti; |
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140 | ti.restart(); |
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141 | readDimacsMat(is, g, desc); |
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142 | if(report) std::cerr << "Read the file: " << ti << '\n'; |
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143 | ti.restart(); |
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144 | MaxMatching<Graph> mat(g); |
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145 | if(report) std::cerr << "Setup MaxMatching class: " << ti << '\n'; |
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146 | ti.restart(); |
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147 | mat.run(); |
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148 | if(report) std::cerr << "Run MaxMatching: " << ti << '\n'; |
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149 | if(report) std::cerr << "\nCardinality of max matching: " |
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150 | << mat.matchingSize() << '\n'; |
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151 | } |
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152 | |
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153 | |
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154 | template<class Value> |
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155 | void solve(ArgParser &ap, std::istream &is, std::ostream &os, |
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156 | DimacsDescriptor &desc) |
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157 | { |
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158 | std::stringstream iss(static_cast<std::string>(ap["infcap"])); |
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159 | Value infty; |
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160 | iss >> infty; |
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161 | if(iss.fail()) |
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162 | { |
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163 | std::cerr << "Cannot interpret '" |
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164 | << static_cast<std::string>(ap["infcap"]) << "' as infinite" |
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165 | << std::endl; |
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166 | exit(1); |
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167 | } |
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168 | |
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169 | switch(desc.type) |
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170 | { |
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171 | case DimacsDescriptor::MIN: |
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172 | solve_min<Value>(ap,is,os,infty,desc); |
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173 | break; |
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174 | case DimacsDescriptor::MAX: |
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175 | solve_max<Value>(ap,is,os,infty,desc); |
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176 | break; |
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177 | case DimacsDescriptor::SP: |
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178 | solve_sp<Value>(ap,is,os,desc); |
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179 | break; |
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180 | case DimacsDescriptor::MAT: |
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181 | solve_mat(ap,is,os,desc); |
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182 | break; |
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183 | default: |
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184 | break; |
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185 | } |
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186 | } |
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187 | |
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188 | int main(int argc, const char *argv[]) { |
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189 | typedef SmartDigraph Digraph; |
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190 | |
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191 | typedef Digraph::Arc Arc; |
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192 | |
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193 | std::string inputName; |
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194 | std::string outputName; |
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195 | |
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196 | ArgParser ap(argc, argv); |
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197 | ap.other("[INFILE [OUTFILE]]", |
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198 | "If either the INFILE or OUTFILE file is missing the standard\n" |
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199 | " input/output will be used instead.") |
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200 | .boolOption("q", "Do not print any report") |
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201 | .boolOption("int","Use 'int' for capacities, costs etc. (default)") |
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202 | .optionGroup("datatype","int") |
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203 | #ifdef HAVE_LONG_LONG |
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204 | .boolOption("long","Use 'long long' for capacities, costs etc.") |
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205 | .optionGroup("datatype","long") |
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206 | #endif |
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207 | .boolOption("double","Use 'double' for capacities, costs etc.") |
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208 | .optionGroup("datatype","double") |
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209 | .boolOption("ldouble","Use 'long double' for capacities, costs etc.") |
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210 | .optionGroup("datatype","ldouble") |
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211 | .onlyOneGroup("datatype") |
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212 | .stringOption("infcap","Value used for 'very high' capacities","0") |
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213 | .run(); |
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214 | |
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215 | std::ifstream input; |
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216 | std::ofstream output; |
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217 | |
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218 | switch(ap.files().size()) |
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219 | { |
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220 | case 2: |
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221 | output.open(ap.files()[1].c_str()); |
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222 | if (!output) { |
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223 | throw IoError("Cannot open the file for writing", ap.files()[1]); |
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224 | } |
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225 | case 1: |
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226 | input.open(ap.files()[0].c_str()); |
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227 | if (!input) { |
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228 | throw IoError("File cannot be found", ap.files()[0]); |
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229 | } |
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230 | case 0: |
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231 | break; |
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232 | default: |
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233 | std::cerr << ap.commandName() << ": too many arguments\n"; |
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234 | return 1; |
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235 | } |
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236 | std::istream& is = (ap.files().size()<1 ? std::cin : input); |
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237 | std::ostream& os = (ap.files().size()<2 ? std::cout : output); |
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238 | |
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239 | DimacsDescriptor desc = dimacsType(is); |
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240 | |
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241 | if(!ap.given("q")) |
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242 | { |
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243 | std::cout << "Problem type: "; |
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244 | switch(desc.type) |
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245 | { |
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246 | case DimacsDescriptor::MIN: |
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247 | std::cout << "min"; |
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248 | break; |
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249 | case DimacsDescriptor::MAX: |
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250 | std::cout << "max"; |
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251 | break; |
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252 | case DimacsDescriptor::SP: |
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253 | std::cout << "sp"; |
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254 | case DimacsDescriptor::MAT: |
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255 | std::cout << "mat"; |
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256 | break; |
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257 | default: |
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258 | exit(1); |
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259 | break; |
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260 | } |
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261 | std::cout << "\nNum of nodes: " << desc.nodeNum; |
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262 | std::cout << "\nNum of arcs: " << desc.edgeNum; |
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263 | std::cout << "\n\n"; |
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264 | } |
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265 | |
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266 | if(ap.given("double")) |
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267 | solve<double>(ap,is,os,desc); |
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268 | else if(ap.given("ldouble")) |
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269 | solve<long double>(ap,is,os,desc); |
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270 | #ifdef HAVE_LONG_LONG |
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271 | else if(ap.given("long")) |
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272 | solve<long long>(ap,is,os,desc); |
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273 | #endif |
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274 | else solve<int>(ap,is,os,desc); |
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275 | |
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276 | return 0; |
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277 | } |
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