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conflict-graph.cpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2014
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
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33
35
36namespace Gecode { namespace Int { namespace BinPacking {
37
40 assert(!(p.none(nodes()) && x.none(nodes())));
41 // Iterate over neighbors of pivot node
42 Nodes n(node[pivot(p,x)].n);
43 // Iterate over elements of p
44 Nodes i(p);
45 // The loop iterates over elements in i - n
46 while (i() < nodes()) {
47 int iv = i(), nv = n();
48 if ((n() < nodes()) && (iv == nv)) {
49 ++i; ++n;
50 } else if ((n() < nodes()) && (iv > nv)) {
51 ++n;
52 } else {
53 ++i; ++n;
54
55 Region reg;
56
57 // Found i.val() to be in i - n
58
59 NodeSet np, nx;
60 np.allocate(reg,nodes());
61 nx.allocate(reg,nodes());
62
63 bool empty = NodeSet::iwn(np,p,nx,x,node[iv].n,nodes());
64
65 p.excl(iv); x.incl(iv);
66
67 // Update current clique
68 cur.incl(iv,node[iv].w);
69
70 if (empty) {
71 // Found a max clique
73 } else {
74 GECODE_ES_CHECK(bk(np,nx));
75 }
76
77 // Reset current clique
78 cur.excl(iv,node[iv].w);
79 }
80 }
81 return ES_OK;
82 }
83
84}}}
85
86// STATISTICS: int-prop
87
int p
Number of positive literals for node type.
int n
Number of negative literals for node type.
Example: Bin packing
void excl(int i, unsigned int w)
Exclude node i with weight w.
void incl(int i, unsigned int w)
Include node i with weight w.
static bool iwn(NodeSet &iwa, const NodeSet &a, NodeSet &iwb, const NodeSet &b, const NodeSet &c, int n)
void allocate(Region &r, int n)
Allocate node set for n nodes.
ExecStatus clique(void)
Report the current clique.
int nodes(void) const
Return number of nodes.
int pivot(const NodeSet &a, const NodeSet &b) const
Find a pivot node with maximal degree from a or b.
Node * node
The nodes in the graph.
ExecStatus bk(NodeSet &p, NodeSet &x)
Run Bosch-Kerbron algorithm for finding max cliques.
Handle to region.
Definition region.hpp:55
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition macros.hpp:91
Gecode toplevel namespace
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
Post propagator for SetVar x
Definition set.hh:767