1 | /* -*- C++ -*- |
---|
2 | * |
---|
3 | * This file is a part of LEMON, a generic C++ optimization library |
---|
4 | * |
---|
5 | * Copyright (C) 2003-2008 |
---|
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_STATIC_GRAPH_H |
---|
20 | #define LEMON_STATIC_GRAPH_H |
---|
21 | |
---|
22 | ///\ingroup graphs |
---|
23 | ///\file |
---|
24 | ///\brief StaticDigraph class. |
---|
25 | |
---|
26 | #include <lemon/core.h> |
---|
27 | #include <lemon/bits/graph_extender.h> |
---|
28 | |
---|
29 | namespace lemon { |
---|
30 | |
---|
31 | class StaticDigraphBase { |
---|
32 | public: |
---|
33 | |
---|
34 | StaticDigraphBase() |
---|
35 | : built(false), node_num(0), arc_num(0), |
---|
36 | node_first_out(NULL), node_first_in(NULL), |
---|
37 | arc_source(NULL), arc_target(NULL), |
---|
38 | arc_next_in(NULL), arc_next_out(NULL) {} |
---|
39 | |
---|
40 | ~StaticDigraphBase() { |
---|
41 | if (built) { |
---|
42 | delete[] node_first_out; |
---|
43 | delete[] node_first_in; |
---|
44 | delete[] arc_source; |
---|
45 | delete[] arc_target; |
---|
46 | delete[] arc_next_out; |
---|
47 | delete[] arc_next_in; |
---|
48 | } |
---|
49 | } |
---|
50 | |
---|
51 | class Node { |
---|
52 | friend class StaticDigraphBase; |
---|
53 | protected: |
---|
54 | int id; |
---|
55 | Node(int _id) : id(_id) {} |
---|
56 | public: |
---|
57 | Node() {} |
---|
58 | Node (Invalid) : id(-1) {} |
---|
59 | bool operator==(const Node& node) const { return id == node.id; } |
---|
60 | bool operator!=(const Node& node) const { return id != node.id; } |
---|
61 | bool operator<(const Node& node) const { return id < node.id; } |
---|
62 | }; |
---|
63 | |
---|
64 | class Arc { |
---|
65 | friend class StaticDigraphBase; |
---|
66 | protected: |
---|
67 | int id; |
---|
68 | Arc(int _id) : id(_id) {} |
---|
69 | public: |
---|
70 | Arc() { } |
---|
71 | Arc (Invalid) : id(-1) {} |
---|
72 | bool operator==(const Arc& arc) const { return id == arc.id; } |
---|
73 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
---|
74 | bool operator<(const Arc& arc) const { return id < arc.id; } |
---|
75 | }; |
---|
76 | |
---|
77 | Node source(const Arc& e) const { return Node(arc_source[e.id]); } |
---|
78 | Node target(const Arc& e) const { return Node(arc_target[e.id]); } |
---|
79 | |
---|
80 | void first(Node& n) const { n.id = node_num - 1; } |
---|
81 | static void next(Node& n) { --n.id; } |
---|
82 | |
---|
83 | void first(Arc& e) const { e.id = arc_num - 1; } |
---|
84 | static void next(Arc& e) { --e.id; } |
---|
85 | |
---|
86 | void firstOut(Arc& e, const Node& n) const { |
---|
87 | e.id = node_first_out[n.id] != node_first_out[n.id + 1] ? |
---|
88 | node_first_out[n.id] : -1; |
---|
89 | } |
---|
90 | void nextOut(Arc& e) const { e.id = arc_next_out[e.id]; } |
---|
91 | |
---|
92 | void firstIn(Arc& e, const Node& n) const { e.id = node_first_in[n.id]; } |
---|
93 | void nextIn(Arc& e) const { e.id = arc_next_in[e.id]; } |
---|
94 | |
---|
95 | int id(const Node& n) const { return n.id; } |
---|
96 | Node nodeFromId(int id) const { return Node(id); } |
---|
97 | int maxNodeId() const { return node_num - 1; } |
---|
98 | |
---|
99 | int id(const Arc& e) const { return e.id; } |
---|
100 | Arc arcFromId(int id) const { return Arc(id); } |
---|
101 | int maxArcId() const { return arc_num - 1; } |
---|
102 | |
---|
103 | typedef True NodeNumTag; |
---|
104 | typedef True ArcNumTag; |
---|
105 | |
---|
106 | int nodeNum() const { return node_num; } |
---|
107 | int arcNum() const { return arc_num; } |
---|
108 | |
---|
109 | private: |
---|
110 | |
---|
111 | template <typename Digraph, typename NodeRefMap> |
---|
112 | class ArcLess { |
---|
113 | public: |
---|
114 | typedef typename Digraph::Arc Arc; |
---|
115 | |
---|
116 | ArcLess(const Digraph &_graph, const NodeRefMap& _nodeRef) |
---|
117 | : digraph(_graph), nodeRef(_nodeRef) {} |
---|
118 | |
---|
119 | bool operator()(const Arc& left, const Arc& right) const { |
---|
120 | return nodeRef[digraph.target(left)] < nodeRef[digraph.target(right)]; |
---|
121 | } |
---|
122 | private: |
---|
123 | const Digraph& digraph; |
---|
124 | const NodeRefMap& nodeRef; |
---|
125 | }; |
---|
126 | |
---|
127 | public: |
---|
128 | |
---|
129 | typedef True BuildTag; |
---|
130 | |
---|
131 | void clear() { |
---|
132 | if (built) { |
---|
133 | delete[] node_first_out; |
---|
134 | delete[] node_first_in; |
---|
135 | delete[] arc_source; |
---|
136 | delete[] arc_target; |
---|
137 | delete[] arc_next_out; |
---|
138 | delete[] arc_next_in; |
---|
139 | } |
---|
140 | built = false; |
---|
141 | node_num = 0; |
---|
142 | arc_num = 0; |
---|
143 | } |
---|
144 | |
---|
145 | template <typename Digraph, typename NodeRefMap, typename ArcRefMap> |
---|
146 | void build(const Digraph& digraph, NodeRefMap& nodeRef, ArcRefMap& arcRef) { |
---|
147 | typedef typename Digraph::Node GNode; |
---|
148 | typedef typename Digraph::Arc GArc; |
---|
149 | |
---|
150 | built = true; |
---|
151 | |
---|
152 | node_num = countNodes(digraph); |
---|
153 | arc_num = countArcs(digraph); |
---|
154 | |
---|
155 | node_first_out = new int[node_num + 1]; |
---|
156 | node_first_in = new int[node_num]; |
---|
157 | |
---|
158 | arc_source = new int[arc_num]; |
---|
159 | arc_target = new int[arc_num]; |
---|
160 | arc_next_out = new int[arc_num]; |
---|
161 | arc_next_in = new int[arc_num]; |
---|
162 | |
---|
163 | int node_index = 0; |
---|
164 | for (typename Digraph::NodeIt n(digraph); n != INVALID; ++n) { |
---|
165 | nodeRef[n] = Node(node_index); |
---|
166 | node_first_in[node_index] = -1; |
---|
167 | ++node_index; |
---|
168 | } |
---|
169 | |
---|
170 | ArcLess<Digraph, NodeRefMap> arcLess(digraph, nodeRef); |
---|
171 | |
---|
172 | int arc_index = 0; |
---|
173 | for (typename Digraph::NodeIt n(digraph); n != INVALID; ++n) { |
---|
174 | int source = nodeRef[n].id; |
---|
175 | std::vector<GArc> arcs; |
---|
176 | for (typename Digraph::OutArcIt e(digraph, n); e != INVALID; ++e) { |
---|
177 | arcs.push_back(e); |
---|
178 | } |
---|
179 | if (!arcs.empty()) { |
---|
180 | node_first_out[source] = arc_index; |
---|
181 | std::sort(arcs.begin(), arcs.end(), arcLess); |
---|
182 | for (typename std::vector<GArc>::iterator it = arcs.begin(); |
---|
183 | it != arcs.end(); ++it) { |
---|
184 | int target = nodeRef[digraph.target(*it)].id; |
---|
185 | arcRef[*it] = Arc(arc_index); |
---|
186 | arc_source[arc_index] = source; |
---|
187 | arc_target[arc_index] = target; |
---|
188 | arc_next_in[arc_index] = node_first_in[target]; |
---|
189 | node_first_in[target] = arc_index; |
---|
190 | arc_next_out[arc_index] = arc_index + 1; |
---|
191 | ++arc_index; |
---|
192 | } |
---|
193 | arc_next_out[arc_index - 1] = -1; |
---|
194 | } else { |
---|
195 | node_first_out[source] = arc_index; |
---|
196 | } |
---|
197 | } |
---|
198 | node_first_out[node_num] = arc_num; |
---|
199 | } |
---|
200 | |
---|
201 | protected: |
---|
202 | |
---|
203 | void fastFirstOut(Arc& e, const Node& n) const { |
---|
204 | e.id = node_first_out[n.id]; |
---|
205 | } |
---|
206 | |
---|
207 | static void fastNextOut(Arc& e) { |
---|
208 | ++e.id; |
---|
209 | } |
---|
210 | void fastLastOut(Arc& e, const Node& n) const { |
---|
211 | e.id = node_first_out[n.id + 1]; |
---|
212 | } |
---|
213 | |
---|
214 | protected: |
---|
215 | bool built; |
---|
216 | int node_num; |
---|
217 | int arc_num; |
---|
218 | int *node_first_out; |
---|
219 | int *node_first_in; |
---|
220 | int *arc_source; |
---|
221 | int *arc_target; |
---|
222 | int *arc_next_in; |
---|
223 | int *arc_next_out; |
---|
224 | }; |
---|
225 | |
---|
226 | typedef DigraphExtender<StaticDigraphBase> ExtendedStaticDigraphBase; |
---|
227 | |
---|
228 | |
---|
229 | class StaticDigraph : public ExtendedStaticDigraphBase { |
---|
230 | public: |
---|
231 | |
---|
232 | typedef ExtendedStaticDigraphBase Parent; |
---|
233 | |
---|
234 | public: |
---|
235 | |
---|
236 | template <typename Digraph, typename NodeRefMap, typename ArcRefMap> |
---|
237 | void build(const Digraph& digraph, NodeRefMap& nodeRef, ArcRefMap& arcRef) { |
---|
238 | if (built) Parent::clear(); |
---|
239 | Parent::build(digraph, nodeRef, arcRef); |
---|
240 | } |
---|
241 | |
---|
242 | |
---|
243 | protected: |
---|
244 | |
---|
245 | using Parent::fastFirstOut; |
---|
246 | using Parent::fastNextOut; |
---|
247 | using Parent::fastLastOut; |
---|
248 | |
---|
249 | public: |
---|
250 | |
---|
251 | class OutArcIt : public Arc { |
---|
252 | public: |
---|
253 | |
---|
254 | OutArcIt() { } |
---|
255 | |
---|
256 | OutArcIt(Invalid i) : Arc(i) { } |
---|
257 | |
---|
258 | OutArcIt(const StaticDigraph& digraph, const Node& node) { |
---|
259 | digraph.fastFirstOut(*this, node); |
---|
260 | digraph.fastLastOut(last, node); |
---|
261 | if (last == *this) *this = INVALID; |
---|
262 | } |
---|
263 | |
---|
264 | OutArcIt(const StaticDigraph& digraph, const Arc& arc) : Arc(arc) { |
---|
265 | if (arc != INVALID) { |
---|
266 | digraph.fastLastOut(last, digraph.source(arc)); |
---|
267 | } |
---|
268 | } |
---|
269 | |
---|
270 | OutArcIt& operator++() { |
---|
271 | StaticDigraph::fastNextOut(*this); |
---|
272 | if (last == *this) *this = INVALID; |
---|
273 | return *this; |
---|
274 | } |
---|
275 | |
---|
276 | private: |
---|
277 | Arc last; |
---|
278 | }; |
---|
279 | |
---|
280 | Node baseNode(const OutArcIt &arc) const { |
---|
281 | return Parent::source(static_cast<const Arc&>(arc)); |
---|
282 | } |
---|
283 | |
---|
284 | Node runningNode(const OutArcIt &arc) const { |
---|
285 | return Parent::target(static_cast<const Arc&>(arc)); |
---|
286 | } |
---|
287 | |
---|
288 | Node baseNode(const InArcIt &arc) const { |
---|
289 | return Parent::target(static_cast<const Arc&>(arc)); |
---|
290 | } |
---|
291 | |
---|
292 | Node runningNode(const InArcIt &arc) const { |
---|
293 | return Parent::source(static_cast<const Arc&>(arc)); |
---|
294 | } |
---|
295 | |
---|
296 | }; |
---|
297 | |
---|
298 | } |
---|
299 | |
---|
300 | #endif |
---|