[906] | 1 | /* -*- C++ -*- |
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[1435] | 2 | * lemon/dimacs.h - Part of LEMON, a generic C++ optimization library |
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[906] | 3 | * |
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[1164] | 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[906] | 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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[921] | 17 | #ifndef LEMON_DIMACS_H |
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| 18 | #define LEMON_DIMACS_H |
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[423] | 19 | |
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| 20 | #include <iostream> |
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| 21 | #include <string> |
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| 22 | #include <vector> |
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[921] | 23 | #include <lemon/maps.h> |
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[1190] | 24 | #include <lemon/invalid.h> |
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[423] | 25 | |
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[1287] | 26 | /// \ingroup dimacs_group |
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[442] | 27 | /// \file |
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| 28 | /// \brief Dimacs file format reader. |
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[427] | 29 | |
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[921] | 30 | namespace lemon { |
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[423] | 31 | |
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[1287] | 32 | /// |
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| 33 | ///@defgroup dimacs_group DIMACS format |
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| 34 | ///\brief Read and write files in DIMACS format |
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| 35 | /// |
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| 36 | ///Tools to read a graph from or write it to a file in DIMACS format |
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| 37 | ///data |
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| 38 | ///\ingroup io_group |
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[423] | 39 | |
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[1287] | 40 | /// \addtogroup dimacs_group |
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[575] | 41 | /// @{ |
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| 42 | |
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| 43 | /// Dimacs min cost flow reader function. |
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| 44 | |
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| 45 | /// This function reads a min cost flow instance from dimacs format, |
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[964] | 46 | /// i.e. from dimacs files having a line starting with |
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| 47 | /// \code |
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| 48 | /// p "min" |
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| 49 | /// \endcode |
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[575] | 50 | /// At the beginning \c g is cleared by \c g.clear(). The edge |
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| 51 | /// capacities are written to \c capacity, \c s and \c t are set to |
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| 52 | /// the source and the target nodes resp. and the cost of the edges |
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| 53 | /// are written to \c cost. |
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[465] | 54 | /// |
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[575] | 55 | /// \author Marton Makai |
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[528] | 56 | template<typename Graph, typename CapacityMap, typename CostMap> |
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| 57 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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| 58 | typename Graph::Node &s, typename Graph::Node &t, |
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| 59 | CostMap& cost) { |
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| 60 | g.clear(); |
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[987] | 61 | typename CapacityMap::Value _cap; |
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| 62 | typename CostMap::Value _cost; |
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[528] | 63 | char d; |
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| 64 | std::string problem; |
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| 65 | char c; |
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| 66 | int i, j; |
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| 67 | std::string str; |
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| 68 | int n, m; |
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| 69 | typename Graph::Edge e; |
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| 70 | std::vector<typename Graph::Node> nodes; |
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| 71 | while (is>>c) { |
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| 72 | switch (c) { |
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| 73 | case 'c': //comment |
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| 74 | getline(is, str); |
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| 75 | break; |
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| 76 | case 'p': //problem definition |
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| 77 | is >> problem >> n >> m; |
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| 78 | getline(is, str); |
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| 79 | nodes.resize(n+1); |
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| 80 | for (int k=1; k<=n; ++k) nodes[k]=g.addNode(); |
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| 81 | break; |
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| 82 | case 'n': //node definition |
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| 83 | if (problem=="sp") { //shortest path problem |
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| 84 | is >> i; |
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| 85 | getline(is, str); |
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| 86 | s=nodes[i]; |
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| 87 | } |
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| 88 | if (problem=="max" || problem=="min") { //((max) or (min cost)) flow problem |
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| 89 | is >> i >> d; |
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| 90 | getline(is, str); |
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| 91 | if (d=='s') s=nodes[i]; |
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| 92 | if (d=='t') t=nodes[i]; |
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| 93 | } |
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| 94 | break; |
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| 95 | case 'a': |
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| 96 | if ( problem == "max" || problem == "sp") { |
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| 97 | is >> i >> j >> _cap; |
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| 98 | getline(is, str); |
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| 99 | e=g.addEdge(nodes[i], nodes[j]); |
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[784] | 100 | //capacity.update(); |
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[528] | 101 | capacity.set(e, _cap); |
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[575] | 102 | } else { |
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| 103 | if ( problem == "min" ) { |
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| 104 | is >> i >> j >> _cap >> _cost; |
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| 105 | getline(is, str); |
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| 106 | e=g.addEdge(nodes[i], nodes[j]); |
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[784] | 107 | //capacity.update(); |
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[575] | 108 | capacity.set(e, _cap); |
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[784] | 109 | //cost.update(); |
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[575] | 110 | cost.set(e, _cost); |
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| 111 | } else { |
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| 112 | is >> i >> j; |
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| 113 | getline(is, str); |
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| 114 | g.addEdge(nodes[i], nodes[j]); |
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| 115 | } |
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[528] | 116 | } |
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| 117 | break; |
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| 118 | } |
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| 119 | } |
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| 120 | } |
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| 121 | |
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| 122 | |
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[575] | 123 | /// Dimacs max flow reader function. |
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| 124 | |
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| 125 | /// This function reads a max flow instance from dimacs format, |
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[964] | 126 | /// i.e. from dimacs files having a line starting with |
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| 127 | /// \code |
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| 128 | /// p "max" |
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| 129 | /// \endcode |
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| 130 | ///At the beginning \c g is cleared by \c g.clear(). The |
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[575] | 131 | /// edge capacities are written to \c capacity and \c s and \c t are |
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| 132 | /// set to the source and the target nodes. |
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| 133 | /// |
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| 134 | /// \author Marton Makai |
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| 135 | template<typename Graph, typename CapacityMap> |
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| 136 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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| 137 | typename Graph::Node &s, typename Graph::Node &t) { |
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| 138 | NullMap<typename Graph::Edge, int> n; |
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| 139 | readDimacs(is, g, capacity, s, t, n); |
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| 140 | } |
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| 141 | |
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| 142 | |
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| 143 | /// Dimacs shortest path reader function. |
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| 144 | |
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| 145 | /// This function reads a shortest path instance from dimacs format, |
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[964] | 146 | /// i.e. from dimacs files having a line starting with |
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| 147 | /// \code |
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| 148 | /// p "sp" |
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| 149 | /// \endcode |
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[575] | 150 | /// At the beginning \c g is cleared by \c g.clear(). The edge |
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| 151 | /// capacities are written to \c capacity and \c s is set to the |
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| 152 | /// source node. |
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| 153 | /// |
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| 154 | /// \author Marton Makai |
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| 155 | template<typename Graph, typename CapacityMap> |
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| 156 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, |
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| 157 | typename Graph::Node &s) { |
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| 158 | NullMap<typename Graph::Edge, int> n; |
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| 159 | readDimacs(is, g, capacity, s, s, n); |
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| 160 | } |
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| 161 | |
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| 162 | |
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| 163 | /// Dimacs capacitated graph reader function. |
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| 164 | |
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| 165 | /// This function reads an edge capacitated graph instance from |
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| 166 | /// dimacs format. At the beginning \c g is cleared by \c g.clear() |
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| 167 | /// and the edge capacities are written to \c capacity. |
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| 168 | /// |
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| 169 | /// \author Marton Makai |
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| 170 | template<typename Graph, typename CapacityMap> |
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| 171 | void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity) { |
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| 172 | typename Graph::Node u; |
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| 173 | NullMap<typename Graph::Edge, int> n; |
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| 174 | readDimacs(is, g, capacity, u, u, n); |
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| 175 | } |
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| 176 | |
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| 177 | |
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| 178 | /// Dimacs plain graph reader function. |
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| 179 | |
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| 180 | /// This function reads a graph without any designated nodes and |
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| 181 | /// maps from dimacs format, i.e. from dimacs files having a line |
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[964] | 182 | /// starting with |
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| 183 | /// \code |
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| 184 | /// p "mat" |
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| 185 | /// \endcode |
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| 186 | /// At the beginning \c g is cleared |
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[575] | 187 | /// by \c g.clear(). |
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| 188 | /// |
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| 189 | /// \author Marton Makai |
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| 190 | template<typename Graph> |
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| 191 | void readDimacs(std::istream& is, Graph &g) { |
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| 192 | typename Graph::Node u; |
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| 193 | NullMap<typename Graph::Edge, int> n; |
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| 194 | readDimacs(is, g, n, u, u, n); |
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| 195 | } |
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| 196 | |
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| 197 | |
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| 198 | |
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[423] | 199 | |
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[528] | 200 | /// write matching problem |
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| 201 | template<typename Graph> |
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| 202 | void writeDimacs(std::ostream& os, const Graph &g) { |
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| 203 | typedef typename Graph::NodeIt NodeIt; |
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| 204 | typedef typename Graph::EdgeIt EdgeIt; |
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| 205 | |
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| 206 | typename Graph::template NodeMap<int> nodes(g); |
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| 207 | |
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| 208 | os << "c matching problem" << std::endl; |
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| 209 | |
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| 210 | int i=1; |
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[778] | 211 | for(NodeIt v(g); v!=INVALID; ++v) { |
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[528] | 212 | nodes.set(v, i); |
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| 213 | ++i; |
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| 214 | } |
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| 215 | |
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| 216 | os << "p mat " << g.nodeNum() << " " << g.edgeNum() << std::endl; |
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| 217 | |
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[778] | 218 | for(EdgeIt e(g); e!=INVALID; ++e) { |
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[986] | 219 | os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] << std::endl; |
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[528] | 220 | } |
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| 221 | |
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| 222 | } |
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| 223 | |
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[575] | 224 | /// @} |
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[528] | 225 | |
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[921] | 226 | } //namespace lemon |
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[423] | 227 | |
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[921] | 228 | #endif //LEMON_DIMACS_H |
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