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 algorithm for solving the |
---|
22 | /// Constrained shortest Path Problem |
---|
23 | /// |
---|
24 | /// \include csp_demo.cc |
---|
25 | |
---|
26 | #include <iostream> |
---|
27 | #include <lemon/list_graph.h> |
---|
28 | #include <lemon/csp.h> |
---|
29 | #include <lemon/random.h> |
---|
30 | |
---|
31 | |
---|
32 | using namespace lemon; |
---|
33 | |
---|
34 | |
---|
35 | int main (int, char*[]) |
---|
36 | { |
---|
37 | |
---|
38 | typedef ListGraph Graph; |
---|
39 | typedef Graph::Node Node; |
---|
40 | typedef Graph::Edge Edge; |
---|
41 | typedef Graph::EdgeIt EdgeIt; |
---|
42 | typedef Graph::EdgeMap<double> LengthMap; |
---|
43 | |
---|
44 | Graph g; |
---|
45 | |
---|
46 | const int N=100; |
---|
47 | const int M=20000; |
---|
48 | std::vector<Node> nodes; |
---|
49 | std::vector<Edge> edges; |
---|
50 | |
---|
51 | for(int i=0;i<N;i++) nodes.push_back(g.addNode()); |
---|
52 | |
---|
53 | for(int i=0;i<M;i++) |
---|
54 | edges.push_back(g.addEdge(nodes[rnd[N]],nodes[rnd[N]])); |
---|
55 | |
---|
56 | LengthMap cost(g); |
---|
57 | LengthMap delay(g); |
---|
58 | for(EdgeIt e(g);e!=INVALID;++e) |
---|
59 | { |
---|
60 | cost[e]=0.01+rnd(.99); |
---|
61 | delay[e]=0.01+rnd(.99); |
---|
62 | } |
---|
63 | |
---|
64 | ConstrainedShortestPath<Graph,LengthMap,LengthMap> csp(g,cost,delay); |
---|
65 | for(double d=0;d<2;d+=.001) |
---|
66 | { |
---|
67 | double lo_bo; |
---|
68 | std::cout << d << ": "; |
---|
69 | SimplePath<Graph> r = csp.larac(nodes[0],nodes[1],d,lo_bo); |
---|
70 | if(r.empty()) std::cout << "INFEASIBLE\n"; |
---|
71 | else std::cout << "delay: " << csp.delay(r) |
---|
72 | << " cost: " << csp.cost(r) |
---|
73 | << " (lb: " << lo_bo |
---|
74 | << " gap: " << csp.cost(r)-lo_bo |
---|
75 | << " , " << (csp.cost(r)-lo_bo)/csp.cost(r)*100 |
---|
76 | << "%)" << std::endl; |
---|
77 | } |
---|
78 | |
---|
79 | return 0; |
---|
80 | } |
---|