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) 2003-2009 |
---|
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 | #ifndef LEMON_DIMACS_H |
---|
20 | #define LEMON_DIMACS_H |
---|
21 | |
---|
22 | #include <iostream> |
---|
23 | #include <string> |
---|
24 | #include <vector> |
---|
25 | #include <limits> |
---|
26 | #include <lemon/maps.h> |
---|
27 | #include <lemon/error.h> |
---|
28 | /// \ingroup dimacs_group |
---|
29 | /// \file |
---|
30 | /// \brief DIMACS file format reader. |
---|
31 | |
---|
32 | namespace lemon { |
---|
33 | |
---|
34 | /// \addtogroup dimacs_group |
---|
35 | /// @{ |
---|
36 | |
---|
37 | /// DIMACS file type descriptor. |
---|
38 | struct DimacsDescriptor |
---|
39 | { |
---|
40 | ///File type enum |
---|
41 | enum Type |
---|
42 | { |
---|
43 | NONE, MIN, MAX, SP, MAT |
---|
44 | }; |
---|
45 | ///The file type |
---|
46 | Type type; |
---|
47 | ///The number of nodes in the graph |
---|
48 | int nodeNum; |
---|
49 | ///The number of edges in the graph |
---|
50 | int edgeNum; |
---|
51 | int lineShift; |
---|
52 | /// Constructor. Sets the type to NONE. |
---|
53 | DimacsDescriptor() : type(NONE) {} |
---|
54 | }; |
---|
55 | |
---|
56 | ///Discover the type of a DIMACS file |
---|
57 | |
---|
58 | ///It starts seeking the beginning of the file for the problem type |
---|
59 | ///and size info. The found data is returned in a special struct |
---|
60 | ///that can be evaluated and passed to the appropriate reader |
---|
61 | ///function. |
---|
62 | DimacsDescriptor dimacsType(std::istream& is) |
---|
63 | { |
---|
64 | DimacsDescriptor r; |
---|
65 | std::string problem,str; |
---|
66 | char c; |
---|
67 | r.lineShift=0; |
---|
68 | while (is >> c) |
---|
69 | switch(c) |
---|
70 | { |
---|
71 | case 'p': |
---|
72 | if(is >> problem >> r.nodeNum >> r.edgeNum) |
---|
73 | { |
---|
74 | getline(is, str); |
---|
75 | r.lineShift++; |
---|
76 | if(problem=="min") r.type=DimacsDescriptor::MIN; |
---|
77 | else if(problem=="max") r.type=DimacsDescriptor::MAX; |
---|
78 | else if(problem=="sp") r.type=DimacsDescriptor::SP; |
---|
79 | else if(problem=="mat") r.type=DimacsDescriptor::MAT; |
---|
80 | else throw FormatError("Unknown problem type"); |
---|
81 | return r; |
---|
82 | } |
---|
83 | else |
---|
84 | { |
---|
85 | throw FormatError("Missing or wrong problem type declaration."); |
---|
86 | } |
---|
87 | break; |
---|
88 | case 'c': |
---|
89 | getline(is, str); |
---|
90 | r.lineShift++; |
---|
91 | break; |
---|
92 | default: |
---|
93 | throw FormatError("Unknown DIMACS declaration."); |
---|
94 | } |
---|
95 | throw FormatError("Missing problem type declaration."); |
---|
96 | } |
---|
97 | |
---|
98 | |
---|
99 | |
---|
100 | /// DIMACS minimum cost flow reader function. |
---|
101 | /// |
---|
102 | /// This function reads a minimum cost flow instance from DIMACS format, |
---|
103 | /// i.e. from a DIMACS file having a line starting with |
---|
104 | /// \code |
---|
105 | /// p min |
---|
106 | /// \endcode |
---|
107 | /// At the beginning, \c g is cleared by \c g.clear(). The supply |
---|
108 | /// amount of the nodes are written to the \c supply node map |
---|
109 | /// (they are signed values). The lower bounds, capacities and costs |
---|
110 | /// of the arcs are written to the \c lower, \c capacity and \c cost |
---|
111 | /// arc maps. |
---|
112 | /// |
---|
113 | /// If the capacity of an arc is less than the lower bound, it will |
---|
114 | /// be set to "infinite" instead. The actual value of "infinite" is |
---|
115 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
---|
116 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
---|
117 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
---|
118 | /// a non-zero value, that value will be used as "infinite". |
---|
119 | /// |
---|
120 | /// If the file type was previously evaluated by dimacsType(), then |
---|
121 | /// the descriptor struct should be given by the \c dest parameter. |
---|
122 | template <typename Digraph, typename LowerMap, |
---|
123 | typename CapacityMap, typename CostMap, |
---|
124 | typename SupplyMap> |
---|
125 | void readDimacsMin(std::istream& is, |
---|
126 | Digraph &g, |
---|
127 | LowerMap& lower, |
---|
128 | CapacityMap& capacity, |
---|
129 | CostMap& cost, |
---|
130 | SupplyMap& supply, |
---|
131 | typename CapacityMap::Value infty = 0, |
---|
132 | DimacsDescriptor desc=DimacsDescriptor()) |
---|
133 | { |
---|
134 | g.clear(); |
---|
135 | std::vector<typename Digraph::Node> nodes; |
---|
136 | typename Digraph::Arc e; |
---|
137 | std::string problem, str; |
---|
138 | char c; |
---|
139 | int i, j; |
---|
140 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
---|
141 | if(desc.type!=DimacsDescriptor::MIN) |
---|
142 | throw FormatError("Problem type mismatch"); |
---|
143 | |
---|
144 | nodes.resize(desc.nodeNum + 1); |
---|
145 | for (int k = 1; k <= desc.nodeNum; ++k) { |
---|
146 | nodes[k] = g.addNode(); |
---|
147 | supply.set(nodes[k], 0); |
---|
148 | } |
---|
149 | |
---|
150 | typename SupplyMap::Value sup; |
---|
151 | typename CapacityMap::Value low; |
---|
152 | typename CapacityMap::Value cap; |
---|
153 | typename CostMap::Value co; |
---|
154 | typedef typename CapacityMap::Value Capacity; |
---|
155 | if(infty==0) |
---|
156 | infty = std::numeric_limits<Capacity>::has_infinity ? |
---|
157 | std::numeric_limits<Capacity>::infinity() : |
---|
158 | std::numeric_limits<Capacity>::max(); |
---|
159 | |
---|
160 | while (is >> c) { |
---|
161 | switch (c) { |
---|
162 | case 'c': // comment line |
---|
163 | getline(is, str); |
---|
164 | break; |
---|
165 | case 'n': // node definition line |
---|
166 | is >> i >> sup; |
---|
167 | getline(is, str); |
---|
168 | supply.set(nodes[i], sup); |
---|
169 | break; |
---|
170 | case 'a': // arc definition line |
---|
171 | is >> i >> j >> low >> cap >> co; |
---|
172 | getline(is, str); |
---|
173 | e = g.addArc(nodes[i], nodes[j]); |
---|
174 | lower.set(e, low); |
---|
175 | if (cap >= low) |
---|
176 | capacity.set(e, cap); |
---|
177 | else |
---|
178 | capacity.set(e, infty); |
---|
179 | cost.set(e, co); |
---|
180 | break; |
---|
181 | } |
---|
182 | } |
---|
183 | } |
---|
184 | |
---|
185 | template<typename Digraph, typename CapacityMap> |
---|
186 | void _readDimacs(std::istream& is, |
---|
187 | Digraph &g, |
---|
188 | CapacityMap& capacity, |
---|
189 | typename Digraph::Node &s, |
---|
190 | typename Digraph::Node &t, |
---|
191 | typename CapacityMap::Value infty = 0, |
---|
192 | DimacsDescriptor desc=DimacsDescriptor()) { |
---|
193 | g.clear(); |
---|
194 | s=t=INVALID; |
---|
195 | std::vector<typename Digraph::Node> nodes; |
---|
196 | typename Digraph::Arc e; |
---|
197 | char c, d; |
---|
198 | int i, j; |
---|
199 | typename CapacityMap::Value _cap; |
---|
200 | std::string str; |
---|
201 | nodes.resize(desc.nodeNum + 1); |
---|
202 | for (int k = 1; k <= desc.nodeNum; ++k) { |
---|
203 | nodes[k] = g.addNode(); |
---|
204 | } |
---|
205 | typedef typename CapacityMap::Value Capacity; |
---|
206 | |
---|
207 | if(infty==0) |
---|
208 | infty = std::numeric_limits<Capacity>::has_infinity ? |
---|
209 | std::numeric_limits<Capacity>::infinity() : |
---|
210 | std::numeric_limits<Capacity>::max(); |
---|
211 | |
---|
212 | while (is >> c) { |
---|
213 | switch (c) { |
---|
214 | case 'c': // comment line |
---|
215 | getline(is, str); |
---|
216 | break; |
---|
217 | case 'n': // node definition line |
---|
218 | if (desc.type==DimacsDescriptor::SP) { // shortest path problem |
---|
219 | is >> i; |
---|
220 | getline(is, str); |
---|
221 | s = nodes[i]; |
---|
222 | } |
---|
223 | if (desc.type==DimacsDescriptor::MAX) { // max flow problem |
---|
224 | is >> i >> d; |
---|
225 | getline(is, str); |
---|
226 | if (d == 's') s = nodes[i]; |
---|
227 | if (d == 't') t = nodes[i]; |
---|
228 | } |
---|
229 | break; |
---|
230 | case 'a': // arc definition line |
---|
231 | if (desc.type==DimacsDescriptor::SP) { |
---|
232 | is >> i >> j >> _cap; |
---|
233 | getline(is, str); |
---|
234 | e = g.addArc(nodes[i], nodes[j]); |
---|
235 | capacity.set(e, _cap); |
---|
236 | } |
---|
237 | else if (desc.type==DimacsDescriptor::MAX) { |
---|
238 | is >> i >> j >> _cap; |
---|
239 | getline(is, str); |
---|
240 | e = g.addArc(nodes[i], nodes[j]); |
---|
241 | if (_cap >= 0) |
---|
242 | capacity.set(e, _cap); |
---|
243 | else |
---|
244 | capacity.set(e, infty); |
---|
245 | } |
---|
246 | else { |
---|
247 | is >> i >> j; |
---|
248 | getline(is, str); |
---|
249 | g.addArc(nodes[i], nodes[j]); |
---|
250 | } |
---|
251 | break; |
---|
252 | } |
---|
253 | } |
---|
254 | } |
---|
255 | |
---|
256 | /// DIMACS maximum flow reader function. |
---|
257 | /// |
---|
258 | /// This function reads a maximum flow instance from DIMACS format, |
---|
259 | /// i.e. from a DIMACS file having a line starting with |
---|
260 | /// \code |
---|
261 | /// p max |
---|
262 | /// \endcode |
---|
263 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
---|
264 | /// capacities are written to the \c capacity arc map and \c s and |
---|
265 | /// \c t are set to the source and the target nodes. |
---|
266 | /// |
---|
267 | /// If the capacity of an arc is negative, it will |
---|
268 | /// be set to "infinite" instead. The actual value of "infinite" is |
---|
269 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
---|
270 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
---|
271 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
---|
272 | /// a non-zero value, that value will be used as "infinite". |
---|
273 | /// |
---|
274 | /// If the file type was previously evaluated by dimacsType(), then |
---|
275 | /// the descriptor struct should be given by the \c dest parameter. |
---|
276 | template<typename Digraph, typename CapacityMap> |
---|
277 | void readDimacsMax(std::istream& is, |
---|
278 | Digraph &g, |
---|
279 | CapacityMap& capacity, |
---|
280 | typename Digraph::Node &s, |
---|
281 | typename Digraph::Node &t, |
---|
282 | typename CapacityMap::Value infty = 0, |
---|
283 | DimacsDescriptor desc=DimacsDescriptor()) { |
---|
284 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
---|
285 | if(desc.type!=DimacsDescriptor::MAX) |
---|
286 | throw FormatError("Problem type mismatch"); |
---|
287 | _readDimacs(is,g,capacity,s,t,infty,desc); |
---|
288 | } |
---|
289 | |
---|
290 | /// DIMACS shortest path reader function. |
---|
291 | /// |
---|
292 | /// This function reads a shortest path instance from DIMACS format, |
---|
293 | /// i.e. from a DIMACS file having a line starting with |
---|
294 | /// \code |
---|
295 | /// p sp |
---|
296 | /// \endcode |
---|
297 | /// At the beginning, \c g is cleared by \c g.clear(). The arc |
---|
298 | /// lengths are written to the \c length arc map and \c s is set to the |
---|
299 | /// source node. |
---|
300 | /// |
---|
301 | /// If the file type was previously evaluated by dimacsType(), then |
---|
302 | /// the descriptor struct should be given by the \c dest parameter. |
---|
303 | template<typename Digraph, typename LengthMap> |
---|
304 | void readDimacsSp(std::istream& is, |
---|
305 | Digraph &g, |
---|
306 | LengthMap& length, |
---|
307 | typename Digraph::Node &s, |
---|
308 | DimacsDescriptor desc=DimacsDescriptor()) { |
---|
309 | typename Digraph::Node t; |
---|
310 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
---|
311 | if(desc.type!=DimacsDescriptor::SP) |
---|
312 | throw FormatError("Problem type mismatch"); |
---|
313 | _readDimacs(is, g, length, s, t, 0, desc); |
---|
314 | } |
---|
315 | |
---|
316 | /// DIMACS capacitated digraph reader function. |
---|
317 | /// |
---|
318 | /// This function reads an arc capacitated digraph instance from |
---|
319 | /// DIMACS 'max' or 'sp' format. |
---|
320 | /// At the beginning, \c g is cleared by \c g.clear() |
---|
321 | /// and the arc capacities/lengths are written to the \c capacity |
---|
322 | /// arc map. |
---|
323 | /// |
---|
324 | /// In case of the 'max' format, if the capacity of an arc is negative, |
---|
325 | /// it will |
---|
326 | /// be set to "infinite" instead. The actual value of "infinite" is |
---|
327 | /// contolled by the \c infty parameter. If it is 0 (the default value), |
---|
328 | /// \c std::numeric_limits<Capacity>::infinity() will be used if available, |
---|
329 | /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to |
---|
330 | /// a non-zero value, that value will be used as "infinite". |
---|
331 | /// |
---|
332 | /// If the file type was previously evaluated by dimacsType(), then |
---|
333 | /// the descriptor struct should be given by the \c dest parameter. |
---|
334 | template<typename Digraph, typename CapacityMap> |
---|
335 | void readDimacsCap(std::istream& is, |
---|
336 | Digraph &g, |
---|
337 | CapacityMap& capacity, |
---|
338 | typename CapacityMap::Value infty = 0, |
---|
339 | DimacsDescriptor desc=DimacsDescriptor()) { |
---|
340 | typename Digraph::Node u,v; |
---|
341 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
---|
342 | if(desc.type!=DimacsDescriptor::MAX || desc.type!=DimacsDescriptor::SP) |
---|
343 | throw FormatError("Problem type mismatch"); |
---|
344 | _readDimacs(is, g, capacity, u, v, infty, desc); |
---|
345 | } |
---|
346 | |
---|
347 | template<typename Graph> |
---|
348 | typename enable_if<lemon::UndirectedTagIndicator<Graph>,void>::type |
---|
349 | _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t, |
---|
350 | dummy<0> = 0) |
---|
351 | { |
---|
352 | g.addEdge(s,t); |
---|
353 | } |
---|
354 | template<typename Graph> |
---|
355 | typename disable_if<lemon::UndirectedTagIndicator<Graph>,void>::type |
---|
356 | _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t, |
---|
357 | dummy<1> = 1) |
---|
358 | { |
---|
359 | g.addArc(s,t); |
---|
360 | } |
---|
361 | |
---|
362 | /// DIMACS plain (di)graph reader function. |
---|
363 | /// |
---|
364 | /// This function reads a (di)graph without any designated nodes and |
---|
365 | /// maps from DIMACS format, i.e. from DIMACS files having a line |
---|
366 | /// starting with |
---|
367 | /// \code |
---|
368 | /// p mat |
---|
369 | /// \endcode |
---|
370 | /// At the beginning, \c g is cleared by \c g.clear(). |
---|
371 | /// |
---|
372 | /// If the file type was previously evaluated by dimacsType(), then |
---|
373 | /// the descriptor struct should be given by the \c dest parameter. |
---|
374 | template<typename Graph> |
---|
375 | void readDimacsMat(std::istream& is, Graph &g, |
---|
376 | DimacsDescriptor desc=DimacsDescriptor()) |
---|
377 | { |
---|
378 | if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is); |
---|
379 | if(desc.type!=DimacsDescriptor::MAT) |
---|
380 | throw FormatError("Problem type mismatch"); |
---|
381 | |
---|
382 | g.clear(); |
---|
383 | std::vector<typename Graph::Node> nodes; |
---|
384 | char c; |
---|
385 | int i, j; |
---|
386 | std::string str; |
---|
387 | nodes.resize(desc.nodeNum + 1); |
---|
388 | for (int k = 1; k <= desc.nodeNum; ++k) { |
---|
389 | nodes[k] = g.addNode(); |
---|
390 | } |
---|
391 | |
---|
392 | while (is >> c) { |
---|
393 | switch (c) { |
---|
394 | case 'c': // comment line |
---|
395 | getline(is, str); |
---|
396 | break; |
---|
397 | case 'n': // node definition line |
---|
398 | break; |
---|
399 | case 'a': // arc definition line |
---|
400 | is >> i >> j; |
---|
401 | getline(is, str); |
---|
402 | _addArcEdge(g,nodes[i], nodes[j]); |
---|
403 | break; |
---|
404 | } |
---|
405 | } |
---|
406 | } |
---|
407 | |
---|
408 | /// DIMACS plain digraph writer function. |
---|
409 | /// |
---|
410 | /// This function writes a digraph without any designated nodes and |
---|
411 | /// maps into DIMACS format, i.e. into DIMACS file having a line |
---|
412 | /// starting with |
---|
413 | /// \code |
---|
414 | /// p mat |
---|
415 | /// \endcode |
---|
416 | /// If \c comment is not empty, then it will be printed in the first line |
---|
417 | /// prefixed by 'c'. |
---|
418 | template<typename Digraph> |
---|
419 | void writeDimacsMat(std::ostream& os, const Digraph &g, |
---|
420 | std::string comment="") { |
---|
421 | typedef typename Digraph::NodeIt NodeIt; |
---|
422 | typedef typename Digraph::ArcIt ArcIt; |
---|
423 | |
---|
424 | if(!comment.empty()) |
---|
425 | os << "c " << comment << std::endl; |
---|
426 | os << "p mat " << g.nodeNum() << " " << g.arcNum() << std::endl; |
---|
427 | |
---|
428 | typename Digraph::template NodeMap<int> nodes(g); |
---|
429 | int i = 1; |
---|
430 | for(NodeIt v(g); v != INVALID; ++v) { |
---|
431 | nodes.set(v, i); |
---|
432 | ++i; |
---|
433 | } |
---|
434 | for(ArcIt e(g); e != INVALID; ++e) { |
---|
435 | os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] |
---|
436 | << std::endl; |
---|
437 | } |
---|
438 | } |
---|
439 | |
---|
440 | /// @} |
---|
441 | |
---|
442 | } //namespace lemon |
---|
443 | |
---|
444 | #endif //LEMON_DIMACS_H |
---|