1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
---|
2 | * |
---|
3 | * This file is a part of LEMON, a generic C++ optimization library. |
---|
4 | * |
---|
5 | * Copyright (C) 2003-2013 |
---|
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 |
---|
21 | ///\brief DIMACS problem solver. |
---|
22 | /// |
---|
23 | /// This program solves various problems given in DIMACS format. |
---|
24 | /// |
---|
25 | /// See |
---|
26 | /// \code |
---|
27 | /// dimacs-solver --help |
---|
28 | /// \endcode |
---|
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> |
---|
38 | #include <lemon/time_measure.h> |
---|
39 | |
---|
40 | #include <lemon/arg_parser.h> |
---|
41 | #include <lemon/error.h> |
---|
42 | |
---|
43 | #include <lemon/dijkstra.h> |
---|
44 | #include <lemon/preflow.h> |
---|
45 | #include <lemon/matching.h> |
---|
46 | #include <lemon/network_simplex.h> |
---|
47 | |
---|
48 | using namespace lemon; |
---|
49 | typedef SmartDigraph Digraph; |
---|
50 | DIGRAPH_TYPEDEFS(Digraph); |
---|
51 | typedef SmartGraph Graph; |
---|
52 | |
---|
53 | template<class Value> |
---|
54 | void 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 | |
---|
73 | template<class Value> |
---|
74 | void solve_max(ArgParser &ap, std::istream &is, std::ostream &, |
---|
75 | Value infty, DimacsDescriptor &desc) |
---|
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(); |
---|
83 | readDimacsMax(is, g, cap, s, t, infty, desc); |
---|
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'; |
---|
91 | if(report) std::cerr << "\nMax flow value: " << pre.flowValue() << '\n'; |
---|
92 | } |
---|
93 | |
---|
94 | template<class Value, class LargeValue> |
---|
95 | void solve_min(ArgParser &ap, std::istream &is, std::ostream &, |
---|
96 | Value infty, DimacsDescriptor &desc) |
---|
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; |
---|
103 | |
---|
104 | ti.restart(); |
---|
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 | } |
---|
118 | if (report) std::cerr << "Read the file: " << ti << '\n'; |
---|
119 | |
---|
120 | typedef NetworkSimplex<Digraph, Value> MCF; |
---|
121 | ti.restart(); |
---|
122 | MCF ns(g); |
---|
123 | ns.lowerMap(lower).upperMap(cap).costMap(cost).supplyMap(sup); |
---|
124 | if (sum_sup > 0) ns.supplyType(ns.LEQ); |
---|
125 | if (report) std::cerr << "Setup NetworkSimplex class: " << ti << '\n'; |
---|
126 | ti.restart(); |
---|
127 | typename MCF::ProblemType res = ns.run(); |
---|
128 | if (report) { |
---|
129 | std::cerr << "Run NetworkSimplex: " << ti << "\n\n"; |
---|
130 | std::cerr << "Feasible flow: " << (res == MCF::OPTIMAL ? "found" : |
---|
131 | "not found") << '\n'; |
---|
132 | if (res) std::cerr << "Min flow cost: " |
---|
133 | << ns.template totalCost<LargeValue>() << '\n'; |
---|
134 | } |
---|
135 | } |
---|
136 | |
---|
137 | void solve_mat(ArgParser &ap, std::istream &is, std::ostream &, |
---|
138 | DimacsDescriptor &desc) |
---|
139 | { |
---|
140 | bool report = !ap.given("q"); |
---|
141 | Graph g; |
---|
142 | Timer ti; |
---|
143 | ti.restart(); |
---|
144 | readDimacsMat(is, g, desc); |
---|
145 | if(report) std::cerr << "Read the file: " << ti << '\n'; |
---|
146 | ti.restart(); |
---|
147 | MaxMatching<Graph> mat(g); |
---|
148 | if(report) std::cerr << "Setup MaxMatching class: " << ti << '\n'; |
---|
149 | ti.restart(); |
---|
150 | mat.run(); |
---|
151 | if(report) std::cerr << "Run MaxMatching: " << ti << '\n'; |
---|
152 | if(report) std::cerr << "\nCardinality of max matching: " |
---|
153 | << mat.matchingSize() << '\n'; |
---|
154 | } |
---|
155 | |
---|
156 | |
---|
157 | template<class Value, class LargeValue> |
---|
158 | void solve(ArgParser &ap, std::istream &is, std::ostream &os, |
---|
159 | DimacsDescriptor &desc) |
---|
160 | { |
---|
161 | std::stringstream iss(static_cast<std::string>(ap["infcap"])); |
---|
162 | Value infty; |
---|
163 | iss >> infty; |
---|
164 | if(iss.fail()) |
---|
165 | { |
---|
166 | std::cerr << "Cannot interpret '" |
---|
167 | << static_cast<std::string>(ap["infcap"]) << "' as infinite" |
---|
168 | << std::endl; |
---|
169 | exit(1); |
---|
170 | } |
---|
171 | |
---|
172 | switch(desc.type) |
---|
173 | { |
---|
174 | case DimacsDescriptor::MIN: |
---|
175 | solve_min<Value, LargeValue>(ap,is,os,infty,desc); |
---|
176 | break; |
---|
177 | case DimacsDescriptor::MAX: |
---|
178 | solve_max<Value>(ap,is,os,infty,desc); |
---|
179 | break; |
---|
180 | case DimacsDescriptor::SP: |
---|
181 | solve_sp<Value>(ap,is,os,desc); |
---|
182 | break; |
---|
183 | case DimacsDescriptor::MAT: |
---|
184 | solve_mat(ap,is,os,desc); |
---|
185 | break; |
---|
186 | default: |
---|
187 | break; |
---|
188 | } |
---|
189 | } |
---|
190 | |
---|
191 | int main(int argc, const char *argv[]) { |
---|
192 | |
---|
193 | std::string inputName; |
---|
194 | std::string outputName; |
---|
195 | |
---|
196 | ArgParser ap(argc, argv); |
---|
197 | ap.other("[INFILE [OUTFILE]]", |
---|
198 | "If either the INFILE or OUTFILE file is missing the standard\n" |
---|
199 | " input/output will be used instead.") |
---|
200 | .boolOption("q", "Do not print any report") |
---|
201 | .boolOption("int","Use 'int' for capacities, costs etc. (default)") |
---|
202 | .optionGroup("datatype","int") |
---|
203 | #ifdef LEMON_HAVE_LONG_LONG |
---|
204 | .boolOption("long","Use 'long long' for capacities, costs etc.") |
---|
205 | .optionGroup("datatype","long") |
---|
206 | #endif |
---|
207 | .boolOption("double","Use 'double' for capacities, costs etc.") |
---|
208 | .optionGroup("datatype","double") |
---|
209 | .boolOption("ldouble","Use 'long double' for capacities, costs etc.") |
---|
210 | .optionGroup("datatype","ldouble") |
---|
211 | .onlyOneGroup("datatype") |
---|
212 | .stringOption("infcap","Value used for 'very high' capacities","0") |
---|
213 | .run(); |
---|
214 | |
---|
215 | std::ifstream input; |
---|
216 | std::ofstream output; |
---|
217 | |
---|
218 | switch(ap.files().size()) |
---|
219 | { |
---|
220 | case 2: |
---|
221 | output.open(ap.files()[1].c_str()); |
---|
222 | if (!output) { |
---|
223 | throw IoError("Cannot open the file for writing", ap.files()[1]); |
---|
224 | } |
---|
225 | // fall through |
---|
226 | case 1: |
---|
227 | input.open(ap.files()[0].c_str()); |
---|
228 | if (!input) { |
---|
229 | throw IoError("File cannot be found", ap.files()[0]); |
---|
230 | } |
---|
231 | // fall through |
---|
232 | case 0: |
---|
233 | break; |
---|
234 | default: |
---|
235 | std::cerr << ap.commandName() << ": too many arguments\n"; |
---|
236 | return 1; |
---|
237 | } |
---|
238 | std::istream& is = (ap.files().size()<1 ? std::cin : input); |
---|
239 | std::ostream& os = (ap.files().size()<2 ? std::cout : output); |
---|
240 | |
---|
241 | DimacsDescriptor desc = dimacsType(is); |
---|
242 | |
---|
243 | if(!ap.given("q")) |
---|
244 | { |
---|
245 | std::cout << "Problem type: "; |
---|
246 | switch(desc.type) |
---|
247 | { |
---|
248 | case DimacsDescriptor::MIN: |
---|
249 | std::cout << "min"; |
---|
250 | break; |
---|
251 | case DimacsDescriptor::MAX: |
---|
252 | std::cout << "max"; |
---|
253 | break; |
---|
254 | case DimacsDescriptor::SP: |
---|
255 | std::cout << "sp"; |
---|
256 | break; |
---|
257 | case DimacsDescriptor::MAT: |
---|
258 | std::cout << "mat"; |
---|
259 | break; |
---|
260 | default: |
---|
261 | exit(1); |
---|
262 | break; |
---|
263 | } |
---|
264 | std::cout << "\nNum of nodes: " << desc.nodeNum; |
---|
265 | std::cout << "\nNum of arcs: " << desc.edgeNum; |
---|
266 | std::cout << "\n\n"; |
---|
267 | } |
---|
268 | |
---|
269 | if(ap.given("double")) |
---|
270 | solve<double, double>(ap,is,os,desc); |
---|
271 | else if(ap.given("ldouble")) |
---|
272 | solve<long double, long double>(ap,is,os,desc); |
---|
273 | #ifdef LEMON_HAVE_LONG_LONG |
---|
274 | else if(ap.given("long")) |
---|
275 | solve<long long, long long>(ap,is,os,desc); |
---|
276 | else solve<int, long long>(ap,is,os,desc); |
---|
277 | #else |
---|
278 | else solve<int, long>(ap,is,os,desc); |
---|
279 | #endif |
---|
280 | |
---|
281 | return 0; |
---|
282 | } |
---|