我想构建一个无向二分图,其中边缘将用户与他/她的兴趣联系起来。该图表看起来像这样的模拟,其中用户由绿色圆圈表示,红色圆圈表示兴趣。
为了找到两个用户之间的相似性,我尝试找到第一个用户和第二个用户之间的所有可能路径。例如,用户0和用户4之间有两条可能的路径(0 - > 6 - > 2 - > 8 - > 4和0 - > 5 - > 1 - > 7-> 3->> 8-> 4)。这是我到目前为止所尝试的:
private int v = 4;
public static void Main()
{
var graph = new UndirectedGraph<int, SEdge<int>>();
List<int> vertices = new List<int>();
for (int i = 0; i < 11; i++)
{
vertices.Add(i);
}
graph.AddVertexRange(vertices);
//Edges incident to 0
graph.AddEdge(new SEdge<int>(vertices[0], vertices[5]));
graph.AddEdge(new SEdge<int>(vertices[0], vertices[6]));
//Edges incident to 1
graph.AddEdge(new SEdge<int>(vertices[1], vertices[5]));
graph.AddEdge(new SEdge<int>(vertices[1], vertices[6]));
//Edges incident to 2
graph.AddEdge(new SEdge<int>(vertices[2], vertices[6]));
graph.AddEdge(new SEdge<int>(vertices[2], vertices[8]));
//Edges incident to 3
graph.AddEdge(new SEdge<int>(vertices[3], vertices[7]));
graph.AddEdge(new SEdge<int>(vertices[3], vertices[8]));
//Edges incident to 4
graph.AddEdge(new SEdge<int>(vertices[4], vertices[8]));
Func<SEdge<int>, double> edgeWeights = se => 1.0;
//Vertex distance observer
var observer = new UndirectedVertexPredecessorRecorderObserver<int, SEdge<int>>();
//DFS Algortihm
var dfs = new UndirectedDepthFirstSearchAlgorithm<int, SEdge<int>>(graph);
// dfs.FinishVertex += VertexFinished;
// dfs.ForwardOrCrossEdge += TransverseEdge;
dfs.TreeEdge += TransverseEdge;
dfs.Compute(0);
}
public void TransverseEdge(object sender, EdgeEventArgs<int, SEdge<int>> ed){
if(ed.Edge.Source == v){
Console.WriteLine("Visited {0}", ed.Edge.Source);
}
}
上面的代码只打印一次,但应该打印两次,因为有两条路径。
我还试图实现this回答中给出的解决方案。但是,这打印了一条可能的路径。那么,我如何使用QuickGraph打印两个顶点之间的所有可能路径?
答案 0 :(得分:1)
实际上,当用户数量和选择增长时,路径数量可能呈指数级增长。对于100个用户和项目,如果所有用户都喜欢大多数项目,那么可能的路径数量可能会超过int64的最大值。