1 | /* -*- C++ -*- |
---|
2 | * |
---|
3 | * This file is a part of LEMON, a generic C++ optimization library |
---|
4 | * |
---|
5 | * Copyright (C) 2003-2007 |
---|
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 demos |
---|
20 | ///\file |
---|
21 | ///\brief Demonstrating the usage of LEMON's General Flow algorithm |
---|
22 | /// |
---|
23 | /// This demo program reads a general network circulation problem from the |
---|
24 | /// file 'circulation-input.lgf', runs the preflow based algorithm for |
---|
25 | /// finding a feasible solution and writes the output |
---|
26 | /// to 'circulation-input.lgf' |
---|
27 | /// |
---|
28 | /// \include circulation_demo.cc |
---|
29 | |
---|
30 | #include <iostream> |
---|
31 | |
---|
32 | #include <lemon/list_graph.h> |
---|
33 | #include <lemon/circulation.h> |
---|
34 | #include <lemon/graph_reader.h> |
---|
35 | #include <lemon/graph_writer.h> |
---|
36 | |
---|
37 | using namespace lemon; |
---|
38 | |
---|
39 | |
---|
40 | int main (int, char*[]) |
---|
41 | { |
---|
42 | |
---|
43 | typedef ListGraph Graph; |
---|
44 | typedef Graph::Node Node; |
---|
45 | typedef Graph::NodeIt NodeIt; |
---|
46 | typedef Graph::Edge Edge; |
---|
47 | typedef Graph::EdgeIt EdgeIt; |
---|
48 | typedef Graph::EdgeMap<int> EdgeMap; |
---|
49 | typedef Graph::NodeMap<int> NodeMap; |
---|
50 | typedef Graph::NodeMap<double> DNodeMap; |
---|
51 | |
---|
52 | Graph g; |
---|
53 | EdgeMap lo(g); |
---|
54 | EdgeMap up(g); |
---|
55 | NodeMap delta(g); |
---|
56 | NodeMap nid(g); |
---|
57 | EdgeMap eid(g); |
---|
58 | DNodeMap cx(g); |
---|
59 | DNodeMap cy(g); |
---|
60 | |
---|
61 | GraphReader<Graph>("circulation-input.lgf", g). |
---|
62 | readEdgeMap("lo_cap", lo). |
---|
63 | readEdgeMap("up_cap", up). |
---|
64 | readNodeMap("delta", delta). |
---|
65 | readEdgeMap("label", eid). |
---|
66 | readNodeMap("label", nid). |
---|
67 | readNodeMap("coordinates_x", cx). |
---|
68 | readNodeMap("coordinates_y", cy). |
---|
69 | run(); |
---|
70 | |
---|
71 | Circulation<Graph> gen(g,lo,up,delta); |
---|
72 | bool ret=gen.run(); |
---|
73 | if(ret) |
---|
74 | { |
---|
75 | std::cout << "\nA feasible flow has been found.\n"; |
---|
76 | if(!gen.checkFlow()) std::cerr << "Oops!!!\n"; |
---|
77 | GraphWriter<Graph>("circulation-output.lgf", g). |
---|
78 | writeEdgeMap("lo_cap", lo). |
---|
79 | writeEdgeMap("up_cap", up). |
---|
80 | writeEdgeMap("flow", gen.flowMap()). |
---|
81 | writeNodeMap("delta", delta). |
---|
82 | writeEdgeMap("label", eid). |
---|
83 | writeNodeMap("label", nid). |
---|
84 | writeNodeMap("coordinates_x", cx). |
---|
85 | writeNodeMap("coordinates_y", cy). |
---|
86 | run(); |
---|
87 | } |
---|
88 | else { |
---|
89 | std::cout << "\nThere is no such a flow\n"; |
---|
90 | Graph::NodeMap<int> bar(g); |
---|
91 | gen.barrierMap(bar); |
---|
92 | if(!gen.checkBarrier()) std::cerr << "Dual Oops!!!\n"; |
---|
93 | |
---|
94 | GraphWriter<Graph>("circulation-output.lgf", g). |
---|
95 | writeEdgeMap("lo_cap", lo). |
---|
96 | writeEdgeMap("up_cap", up). |
---|
97 | writeNodeMap("barrier", bar). |
---|
98 | writeNodeMap("delta", delta). |
---|
99 | writeEdgeMap("label", eid). |
---|
100 | writeNodeMap("label", nid). |
---|
101 | writeNodeMap("coordinates_x", cx). |
---|
102 | writeNodeMap("coordinates_y", cy). |
---|
103 | run(); |
---|
104 | } |
---|
105 | std::cout << "The output is written to file 'circulation-output.lgf'\n\n"; |
---|
106 | |
---|
107 | } |
---|