Jip J. Dekker
1d9faf38de
git-subtree-dir: software/gecode git-subtree-split: 313e87646da4fc2752a70e83df16d993121a8e40
88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2014
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <gecode/int/bin-packing.hh>
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namespace Gecode { namespace Int { namespace BinPacking {
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ExecStatus
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ConflictGraph::bk(NodeSet& p, NodeSet& x) {
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assert(!(p.none(nodes()) && x.none(nodes())));
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// Iterate over neighbors of pivot node
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Nodes n(node[pivot(p,x)].n);
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// Iterate over elements of p
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Nodes i(p);
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// The loop iterates over elements in i - n
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while (i() < nodes()) {
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int iv = i(), nv = n();
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if ((n() < nodes()) && (iv == nv)) {
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++i; ++n;
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} else if ((n() < nodes()) && (iv > nv)) {
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++n;
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} else {
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++i; ++n;
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Region reg;
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// Found i.val() to be in i - n
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NodeSet np, nx;
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np.allocate(reg,nodes());
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nx.allocate(reg,nodes());
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bool empty = NodeSet::iwn(np,p,nx,x,node[iv].n,nodes());
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p.excl(iv); x.incl(iv);
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// Update current clique
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cur.incl(iv,node[iv].w);
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if (empty) {
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// Found a max clique
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GECODE_ES_CHECK(clique());
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} else {
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GECODE_ES_CHECK(bk(np,nx));
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}
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// Reset current clique
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cur.excl(iv,node[iv].w);
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}
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}
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return ES_OK;
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}
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}}}
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// STATISTICS: int-prop
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