public static VertexList <int> Get(UndirectedGraph <int, Edge <int> > g, int seed = 123456) // Seeding with 123456 for testing. Seeding with 456789, etc. may provide different CoverSet count
{
var algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(g, new Random(seed));
algorithm.Compute();
return(algorithm.CoverSet);
}
public void Constructor()
{
var graph = new UndirectedGraph <int, Edge <int> >();
var algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph);
AssertAlgorithmState(algorithm, graph);
Assert.IsNull(algorithm.CoverSet);
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(123));
AssertAlgorithmState(algorithm, graph);
Assert.IsNull(algorithm.CoverSet);
}
public void Cover()
{
var graph = new UndirectedGraph <int, Edge <int> >();
var algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph);
algorithm.Compute();
CollectionAssert.IsEmpty(algorithm.CoverSet);
graph.AddVertexRange(new[] { 1, 2, 3 });
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph);
algorithm.Compute();
CollectionAssert.IsEmpty(algorithm.CoverSet);
graph.AddVerticesAndEdgeRange(new[]
{
new Edge <int>(1, 2),
new Edge <int>(2, 2),
new Edge <int>(3, 1)
});
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(123456));
algorithm.Compute();
CollectionAssert.AreEquivalent(
new[] { 1, 2 },
algorithm.CoverSet);
graph.AddVertex(4);
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(123456));
algorithm.Compute();
CollectionAssert.AreEquivalent(
new[] { 1, 2 },
algorithm.CoverSet);
graph.AddVerticesAndEdgeRange(new[]
{
new Edge <int>(5, 2)
});
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(123456));
algorithm.Compute();
CollectionAssert.AreEquivalent(
new[] { 1, 2 },
algorithm.CoverSet);
graph.AddVerticesAndEdgeRange(new[]
{
new Edge <int>(6, 7),
new Edge <int>(7, 8),
new Edge <int>(9, 8)
});
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(123456));
algorithm.Compute();
CollectionAssert.AreEquivalent(
new[] { 2, 3, 7, 9 },
algorithm.CoverSet);
// Other seed give other results
algorithm = new MinimumVertexCoverApproximationAlgorithm <int, Edge <int> >(graph, new Random(456789));
algorithm.Compute();
CollectionAssert.AreEquivalent(
new[] { 1, 2, 7, 8 },
algorithm.CoverSet);
}