76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
//=======================================================================
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// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//=======================================================================
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#include <boost/graph/adjacency_list.hpp>
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#include <boost/graph/kruskal_min_spanning_tree.hpp>
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#include <iostream>
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#include <fstream>
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int main()
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{
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using namespace boost;
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typedef adjacency_list< vecS, vecS, undirectedS, no_property,
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property< edge_weight_t, int > >
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Graph;
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typedef graph_traits< Graph >::edge_descriptor Edge;
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typedef std::pair< int, int > E;
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const int num_nodes = 5;
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E edge_array[] = { E(0, 2), E(1, 3), E(1, 4), E(2, 1), E(2, 3), E(3, 4),
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E(4, 0), E(4, 1) };
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int weights[] = { 1, 1, 2, 7, 3, 1, 1, 1 };
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std::size_t num_edges = sizeof(edge_array) / sizeof(E);
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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
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Graph g(num_nodes);
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property_map< Graph, edge_weight_t >::type weightmap = get(edge_weight, g);
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for (std::size_t j = 0; j < num_edges; ++j)
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{
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Edge e;
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bool inserted;
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boost::tie(e, inserted)
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= add_edge(edge_array[j].first, edge_array[j].second, g);
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weightmap[e] = weights[j];
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}
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#else
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Graph g(edge_array, edge_array + num_edges, weights, num_nodes);
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#endif
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property_map< Graph, edge_weight_t >::type weight = get(edge_weight, g);
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std::vector< Edge > spanning_tree;
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kruskal_minimum_spanning_tree(g, std::back_inserter(spanning_tree));
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std::cout << "Print the edges in the MST:" << std::endl;
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for (std::vector< Edge >::iterator ei = spanning_tree.begin();
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ei != spanning_tree.end(); ++ei)
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{
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std::cout << source(*ei, g) << " <--> " << target(*ei, g)
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<< " with weight of " << weight[*ei] << std::endl;
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}
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std::ofstream fout("figs/kruskal-eg.dot");
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fout << "graph A {\n"
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<< " rankdir=LR\n"
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<< " size=\"3,3\"\n"
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<< " ratio=\"filled\"\n"
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<< " edge[style=\"bold\"]\n"
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<< " node[shape=\"circle\"]\n";
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graph_traits< Graph >::edge_iterator eiter, eiter_end;
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for (boost::tie(eiter, eiter_end) = edges(g); eiter != eiter_end; ++eiter)
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{
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fout << source(*eiter, g) << " -- " << target(*eiter, g);
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if (std::find(spanning_tree.begin(), spanning_tree.end(), *eiter)
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!= spanning_tree.end())
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fout << "[color=\"black\", label=\"" << get(edge_weight, g, *eiter)
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<< "\"];\n";
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else
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fout << "[color=\"gray\", label=\"" << get(edge_weight, g, *eiter)
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<< "\"];\n";
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}
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fout << "}\n";
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return EXIT_SUCCESS;
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}
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