public CycleClustersReport <TNode> GetReport(IGraph <TNode> graph)
{
var cyclesGetter = new GraphCyclesGetter <TNode>();
var cycles = cyclesGetter.GetCycles(graph);
var clusters = GetClusters(cycles);
var maxDensity = 0d;
foreach (var cluster in clusters)
{
if (cluster.Cycles.Count <= 3)
{
continue;
}
var density = cluster.Cycles.Count / (double)cluster.Nodes.Count;
if (density > maxDensity)
{
maxDensity = density;
}
}
return(new CycleClustersReport <TNode>()
{
Clusters = clusters,
MaxDensity = maxDensity,
MaxCyclesInCluster = clusters.Count != 0 ? clusters.Max(x => x.Cycles.Count) : 0,
});
}
public NodesInsideCycleReport <TNode> GetReport(IGraph <TNode> graph)
{
var cyclesGetter = new GraphCyclesGetter <TNode>();
var cycles = cyclesGetter.GetCycles(graph);
var problemsCount = 0;
foreach (var cycle1 in cycles)
{
foreach (var cycle2 in cycles)
{
if (cycle1 == cycle2)
{
continue;
}
var commonNodes = cycle1.Intersect(cycle2).ToList();
var cycle1Only = cycle1.Except(commonNodes).ToList();
var cycle2Only = cycle2.Except(commonNodes).ToList();
if (commonNodes.Count < 3)
{
continue;
}
var positiveCount = 0;
var threshold = 1;
if (HasNonCycleNodes(graph, commonNodes) >= threshold)
{
positiveCount++;
}
if (HasNonCycleNodes(graph, cycle1Only) >= threshold)
{
positiveCount++;
}
if (HasNonCycleNodes(graph, cycle2Only) >= threshold)
{
positiveCount++;
}
if (positiveCount >= 2)
{
problemsCount++;
}
}
}
return(new NodesInsideCycleReport <TNode>()
{
ProblemsCount = problemsCount,
});
}
public void GetCycles_TwoCyclesWithSharedEdge()
{
var graphCyclesGetter = new GraphCyclesGetter <int>();
var graph = new UndirectedAdjacencyListGraph <int>();
graph.AddVertex(0);
graph.AddVertex(1);
graph.AddVertex(2);
graph.AddVertex(3);
graph.AddEdge(0, 1);
graph.AddEdge(1, 2);
graph.AddEdge(2, 0);
graph.AddEdge(2, 3);
graph.AddEdge(3, 0);
var expectedCycles = new List <List <int> >()
{
new List <int>()
{
0, 1, 2
},
new List <int>()
{
0, 2, 3
},
new List <int>()
{
0, 1, 2, 3
},
};
var cycles = graphCyclesGetter.GetCycles(graph);
Assert.That(cycles.Count, Is.EqualTo(expectedCycles.Count));
foreach (var cycle in cycles)
{
var index = expectedCycles.FindIndex(x => x.SequenceEqualWithoutOrder(cycle));
Assert.That(index, Is.GreaterThanOrEqualTo(0));
expectedCycles.RemoveAt(index);
}
}
public void GetCycles_SingleCycle()
{
var graphCyclesGetter = new GraphCyclesGetter <int>();
var graph = new UndirectedAdjacencyListGraph <int>();
var verticesCount = 4;
for (int i = 0; i < verticesCount; i++)
{
graph.AddVertex(i);
if (i > 0)
{
graph.AddEdge(i - 1, i);
}
}
graph.AddEdge(0, verticesCount - 1);
var cycles = graphCyclesGetter.GetCycles(graph);
Assert.That(cycles.Count, Is.EqualTo(1));
Assert.That(cycles[0], Is.EquivalentTo(graph.Vertices));
}
public void GetCycles_MultipleCycles()
{
var graphCyclesGetter = new GraphCyclesGetter <int>();
var graph = new UndirectedAdjacencyListGraph <int>();
graph.AddVertex(0);
graph.AddVertex(1);
graph.AddVertex(2);
graph.AddVertex(3);
graph.AddVertex(4);
graph.AddEdge(0, 1);
graph.AddEdge(0, 2);
graph.AddEdge(0, 3);
graph.AddEdge(0, 4);
graph.AddEdge(1, 2);
graph.AddEdge(2, 3);
graph.AddEdge(3, 4);
var cycles = graphCyclesGetter.GetCycles(graph);
Assert.That(cycles.Count, Is.EqualTo(6));
}