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//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// 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 <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/connected_components.hpp>
/*
This example demonstrates the usage of the connected_components
algorithm on a undirected graph. The example graphs come from
"Introduction to Algorithms", Cormen, Leiserson, and Rivest p. 87
(though we number the vertices from zero instead of one).
Sample output:
Total number of components: 3
Vertex 0 is in component 0
Vertex 1 is in component 0
Vertex 2 is in component 1
Vertex 3 is in component 2
Vertex 4 is in component 0
Vertex 5 is in component 1
*/
using namespace std;
int main(int , char* [])
{
using namespace boost;
{
typedef adjacency_list <vecS, vecS, undirectedS> Graph;
Graph G;
add_edge(0, 1, G);
add_edge(1, 4, G);
add_edge(4, 0, G);
add_edge(2, 5, G);
std::vector<int> component(num_vertices(G));
int num = connected_components(G, &component[0]);
std::vector<int>::size_type i;
cout << "Total number of components: " << num << endl;
for (i = 0; i != component.size(); ++i)
cout << "Vertex " << i <<" is in component " << component[i] << endl;
cout << endl;
}
return 0;
}
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