COIN-OR::LEMON - Graph Library

source: lemon/tools/dimacs-solver.cc @ 1424:7edc220d6244

1.2
Last change on this file since 1424:7edc220d6244 was 1424:7edc220d6244, checked in by Alpar Juttner <alpar@…>, 4 months ago

Backport relevant parts of bugfixes [ad22262328b3], [61fdd06833a6] and [4add05447ca0] to branch 1.2 (#623)

File size: 7.8 KB
RevLine 
[400]1/* -*- mode: C++; indent-tabs-mode: nil; -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library.
4 *
[956]5 * Copyright (C) 2003-2010
[400]6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19///\ingroup tools
20///\file
[579]21///\brief DIMACS problem solver.
[400]22///
[579]23/// This program solves various problems given in DIMACS format.
[400]24///
25/// See
[631]26/// \code
27///   dimacs-solver --help
28/// \endcode
[400]29/// for more info on usage.
30
31#include <iostream>
32#include <fstream>
33#include <cstring>
34
35#include <lemon/smart_graph.h>
36#include <lemon/dimacs.h>
37#include <lemon/lgf_writer.h>
[573]38#include <lemon/time_measure.h>
[400]39
40#include <lemon/arg_parser.h>
[402]41#include <lemon/error.h>
[400]42
[573]43#include <lemon/dijkstra.h>
44#include <lemon/preflow.h>
[641]45#include <lemon/matching.h>
[649]46#include <lemon/network_simplex.h>
[573]47
[400]48using namespace lemon;
[573]49typedef SmartDigraph Digraph;
50DIGRAPH_TYPEDEFS(Digraph);
51typedef SmartGraph Graph;
[400]52
[573]53template<class Value>
54void solve_sp(ArgParser &ap, std::istream &is, std::ostream &,
55              DimacsDescriptor &desc)
56{
57  bool report = !ap.given("q");
58  Digraph g;
59  Node s;
60  Digraph::ArcMap<Value> len(g);
61  Timer t;
62  t.restart();
63  readDimacsSp(is, g, len, s, desc);
64  if(report) std::cerr << "Read the file: " << t << '\n';
65  t.restart();
66  Dijkstra<Digraph, Digraph::ArcMap<Value> > dij(g,len);
67  if(report) std::cerr << "Setup Dijkstra class: " << t << '\n';
68  t.restart();
69  dij.run(s);
70  if(report) std::cerr << "Run Dijkstra: " << t << '\n';
71}
72
73template<class Value>
74void solve_max(ArgParser &ap, std::istream &is, std::ostream &,
[608]75               Value infty, DimacsDescriptor &desc)
[573]76{
77  bool report = !ap.given("q");
78  Digraph g;
79  Node s,t;
80  Digraph::ArcMap<Value> cap(g);
81  Timer ti;
82  ti.restart();
[608]83  readDimacsMax(is, g, cap, s, t, infty, desc);
[573]84  if(report) std::cerr << "Read the file: " << ti << '\n';
85  ti.restart();
86  Preflow<Digraph, Digraph::ArcMap<Value> > pre(g,cap,s,t);
87  if(report) std::cerr << "Setup Preflow class: " << ti << '\n';
88  ti.restart();
89  pre.run();
90  if(report) std::cerr << "Run Preflow: " << ti << '\n';
[956]91  if(report) std::cerr << "\nMax flow value: " << pre.flowValue() << '\n';
[573]92}
93
[919]94template<class Value, class LargeValue>
[649]95void solve_min(ArgParser &ap, std::istream &is, std::ostream &,
[661]96               Value infty, DimacsDescriptor &desc)
[649]97{
98  bool report = !ap.given("q");
99  Digraph g;
100  Digraph::ArcMap<Value> lower(g), cap(g), cost(g);
101  Digraph::NodeMap<Value> sup(g);
102  Timer ti;
[661]103
[649]104  ti.restart();
[661]105  readDimacsMin(is, g, lower, cap, cost, sup, infty, desc);
106  ti.stop();
107  Value sum_sup = 0;
108  for (Digraph::NodeIt n(g); n != INVALID; ++n) {
109    sum_sup += sup[n];
110  }
111  if (report) {
112    std::cerr << "Sum of supply values: " << sum_sup << "\n";
113    if (sum_sup <= 0)
114      std::cerr << "GEQ supply contraints are used for NetworkSimplex\n\n";
115    else
116      std::cerr << "LEQ supply contraints are used for NetworkSimplex\n\n";
117  }
[649]118  if (report) std::cerr << "Read the file: " << ti << '\n';
[661]119
[1167]120  typedef NetworkSimplex<Digraph, Value> MCF;
[649]121  ti.restart();
[1167]122  MCF ns(g);
[687]123  ns.lowerMap(lower).upperMap(cap).costMap(cost).supplyMap(sup);
124  if (sum_sup > 0) ns.supplyType(ns.LEQ);
[649]125  if (report) std::cerr << "Setup NetworkSimplex class: " << ti << '\n';
126  ti.restart();
[1167]127  typename MCF::ProblemType res = ns.run();
[661]128  if (report) {
129    std::cerr << "Run NetworkSimplex: " << ti << "\n\n";
[1167]130    std::cerr << "Feasible flow: " << (res == MCF::OPTIMAL ? "found" : "not found") << '\n';
[919]131    if (res) std::cerr << "Min flow cost: "
132                       << ns.template totalCost<LargeValue>() << '\n';
[661]133  }
[649]134}
135
[573]136void solve_mat(ArgParser &ap, std::istream &is, std::ostream &,
137              DimacsDescriptor &desc)
138{
139  bool report = !ap.given("q");
140  Graph g;
141  Timer ti;
142  ti.restart();
143  readDimacsMat(is, g, desc);
144  if(report) std::cerr << "Read the file: " << ti << '\n';
145  ti.restart();
146  MaxMatching<Graph> mat(g);
147  if(report) std::cerr << "Setup MaxMatching class: " << ti << '\n';
148  ti.restart();
149  mat.run();
150  if(report) std::cerr << "Run MaxMatching: " << ti << '\n';
151  if(report) std::cerr << "\nCardinality of max matching: "
[956]152                       << mat.matchingSize() << '\n';
[573]153}
154
155
[919]156template<class Value, class LargeValue>
[573]157void solve(ArgParser &ap, std::istream &is, std::ostream &os,
158           DimacsDescriptor &desc)
159{
[616]160  std::stringstream iss(static_cast<std::string>(ap["infcap"]));
[608]161  Value infty;
162  iss >> infty;
163  if(iss.fail())
164    {
165      std::cerr << "Cannot interpret '"
166                << static_cast<std::string>(ap["infcap"]) << "' as infinite"
167                << std::endl;
168      exit(1);
169    }
[956]170
[573]171  switch(desc.type)
172    {
173    case DimacsDescriptor::MIN:
[919]174      solve_min<Value, LargeValue>(ap,is,os,infty,desc);
[573]175      break;
176    case DimacsDescriptor::MAX:
[608]177      solve_max<Value>(ap,is,os,infty,desc);
[573]178      break;
179    case DimacsDescriptor::SP:
180      solve_sp<Value>(ap,is,os,desc);
181      break;
182    case DimacsDescriptor::MAT:
183      solve_mat(ap,is,os,desc);
184      break;
185    default:
186      break;
187    }
188}
[400]189
190int main(int argc, const char *argv[]) {
191
192  std::string inputName;
193  std::string outputName;
194
195  ArgParser ap(argc, argv);
[402]196  ap.other("[INFILE [OUTFILE]]",
197           "If either the INFILE or OUTFILE file is missing the standard\n"
198           "     input/output will be used instead.")
[573]199    .boolOption("q", "Do not print any report")
200    .boolOption("int","Use 'int' for capacities, costs etc. (default)")
201    .optionGroup("datatype","int")
[674]202#ifdef LEMON_HAVE_LONG_LONG
[573]203    .boolOption("long","Use 'long long' for capacities, costs etc.")
204    .optionGroup("datatype","long")
205#endif
206    .boolOption("double","Use 'double' for capacities, costs etc.")
207    .optionGroup("datatype","double")
208    .boolOption("ldouble","Use 'long double' for capacities, costs etc.")
209    .optionGroup("datatype","ldouble")
210    .onlyOneGroup("datatype")
[608]211    .stringOption("infcap","Value used for 'very high' capacities","0")
[400]212    .run();
213
[573]214  std::ifstream input;
215  std::ofstream output;
[402]216
217  switch(ap.files().size())
218    {
219    case 2:
220      output.open(ap.files()[1].c_str());
221      if (!output) {
222        throw IoError("Cannot open the file for writing", ap.files()[1]);
223      }
[1424]224      // fall through
[402]225    case 1:
226      input.open(ap.files()[0].c_str());
227      if (!input) {
228        throw IoError("File cannot be found", ap.files()[0]);
229      }
[1424]230      // fall through
[402]231    case 0:
232      break;
233    default:
[573]234      std::cerr << ap.commandName() << ": too many arguments\n";
[402]235      return 1;
[579]236    }
[573]237  std::istream& is = (ap.files().size()<1 ? std::cin : input);
238  std::ostream& os = (ap.files().size()<2 ? std::cout : output);
[402]239
240  DimacsDescriptor desc = dimacsType(is);
[956]241
[573]242  if(!ap.given("q"))
[402]243    {
[573]244      std::cout << "Problem type: ";
245      switch(desc.type)
246        {
247        case DimacsDescriptor::MIN:
248          std::cout << "min";
249          break;
250        case DimacsDescriptor::MAX:
251          std::cout << "max";
252          break;
253        case DimacsDescriptor::SP:
254          std::cout << "sp";
[1424]255          break;
[573]256        case DimacsDescriptor::MAT:
257          std::cout << "mat";
258          break;
259        default:
260          exit(1);
261          break;
262        }
263      std::cout << "\nNum of nodes: " << desc.nodeNum;
264      std::cout << "\nNum of arcs:  " << desc.edgeNum;
[579]265      std::cout << "\n\n";
[400]266    }
[956]267
[573]268  if(ap.given("double"))
[919]269    solve<double, double>(ap,is,os,desc);
[573]270  else if(ap.given("ldouble"))
[919]271    solve<long double, long double>(ap,is,os,desc);
[674]272#ifdef LEMON_HAVE_LONG_LONG
[573]273  else if(ap.given("long"))
[919]274    solve<long long, long long>(ap,is,os,desc);
275  else solve<int, long long>(ap,is,os,desc);
276#else
277  else solve<int, long>(ap,is,os,desc);
[573]278#endif
279
[400]280  return 0;
281}
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