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//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
// Doug Gregor, D. Kevin McGrath
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#include <boost/config.hpp>
#include <vector>
#include <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/king_ordering.hpp>
#include <boost/graph/properties.hpp>
#include <boost/graph/bandwidth.hpp>
/*
Sample Output
original bandwidth: 8
Reverse Cuthill-McKee ordering starting at: 6
8 3 0 9 2 5 1 4 7 6
bandwidth: 4
Reverse Cuthill-McKee ordering starting at: 0
9 1 4 6 7 2 8 5 3 0
bandwidth: 4
Reverse Cuthill-McKee ordering:
0 8 5 7 3 6 4 2 1 9
bandwidth: 4
*/
int main(int, char*[])
{
using namespace boost;
using namespace std;
typedef adjacency_list< vecS, vecS, undirectedS,
property< vertex_color_t, default_color_type,
property< vertex_degree_t, int > > >
Graph;
typedef graph_traits< Graph >::vertex_descriptor Vertex;
typedef graph_traits< Graph >::vertices_size_type size_type;
typedef std::pair< std::size_t, std::size_t > Pair;
Pair edges[14] = { Pair(0, 3), // a-d
Pair(0, 5), // a-f
Pair(1, 2), // b-c
Pair(1, 4), // b-e
Pair(1, 6), // b-g
Pair(1, 9), // b-j
Pair(2, 3), // c-d
Pair(2, 4), // c-e
Pair(3, 5), // d-f
Pair(3, 8), // d-i
Pair(4, 6), // e-g
Pair(5, 6), // f-g
Pair(5, 7), // f-h
Pair(6, 7) }; // g-h
Graph G(10);
for (int i = 0; i < 14; ++i)
add_edge(edges[i].first, edges[i].second, G);
graph_traits< Graph >::vertex_iterator ui, ui_end;
property_map< Graph, vertex_degree_t >::type deg = get(vertex_degree, G);
for (boost::tie(ui, ui_end) = vertices(G); ui != ui_end; ++ui)
deg[*ui] = degree(*ui, G);
property_map< Graph, vertex_index_t >::type index_map
= get(vertex_index, G);
std::cout << "original bandwidth: " << bandwidth(G) << std::endl;
std::vector< Vertex > inv_perm(num_vertices(G));
std::vector< size_type > perm(num_vertices(G));
{
Vertex s = vertex(6, G);
// king_ordering
king_ordering(G, s, inv_perm.rbegin(), get(vertex_color, G),
get(vertex_degree, G), get(vertex_index, G));
cout << "King ordering starting at: " << s << endl;
cout << " ";
for (std::vector< Vertex >::const_iterator i = inv_perm.begin();
i != inv_perm.end(); ++i)
cout << index_map[*i] << " ";
cout << endl;
for (size_type c = 0; c != inv_perm.size(); ++c)
perm[index_map[inv_perm[c]]] = c;
std::cout << " bandwidth: "
<< bandwidth(G,
make_iterator_property_map(
&perm[0], index_map, perm[0]))
<< std::endl;
}
{
Vertex s = vertex(0, G);
// king_ordering
king_ordering(G, s, inv_perm.rbegin(), get(vertex_color, G),
get(vertex_degree, G), get(vertex_index, G));
cout << "King ordering starting at: " << s << endl;
cout << " ";
for (std::vector< Vertex >::const_iterator i = inv_perm.begin();
i != inv_perm.end(); ++i)
cout << index_map[*i] << " ";
cout << endl;
for (size_type c = 0; c != inv_perm.size(); ++c)
perm[index_map[inv_perm[c]]] = c;
std::cout << " bandwidth: "
<< bandwidth(G,
make_iterator_property_map(
&perm[0], index_map, perm[0]))
<< std::endl;
}
{
// king_ordering
king_ordering(G, inv_perm.rbegin());
cout << "King ordering:" << endl;
cout << " ";
for (std::vector< Vertex >::const_iterator i = inv_perm.begin();
i != inv_perm.end(); ++i)
cout << index_map[*i] << " ";
cout << endl;
for (size_type c = 0; c != inv_perm.size(); ++c)
perm[index_map[inv_perm[c]]] = c;
std::cout << " bandwidth: "
<< bandwidth(G,
make_iterator_property_map(
&perm[0], index_map, perm[0]))
<< std::endl;
}
return 0;
}
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