Exemplo n.º 1
0
 private static IEnumerable<Tree> MakeSet(Vertex[] nodes)
 {
     foreach (var n in nodes)
     {
         yield return new Tree(new[] { n }, null);
     }
 }
Exemplo n.º 2
0
 private static void Main()
 {
     Vertex[] nodes = new Vertex[]
     {
         new Vertex("a"),
         new Vertex("b"),
         new Vertex("c"),
         new Vertex("d"),
         new Vertex("e"),
         new Vertex("f"),
         new Vertex("g"),
         new Vertex("h"),
         new Vertex("i"),
         new Vertex("j"),
         new Vertex("k"),
         new Vertex("l"),
     };
     Edge[] edges = new[]
     {
         new Edge(3, nodes[0], nodes[1]),
         new Edge(5, nodes[0], nodes[2]),
         new Edge(4, nodes[0], nodes[3]),
         new Edge(3, nodes[1], nodes[4]),
         new Edge(6, nodes[1], nodes[5]),
         new Edge(2, nodes[2], nodes[3]),
         new Edge(1, nodes[3], nodes[4]),
         new Edge(2, nodes[4], nodes[5]),
         new Edge(4, nodes[2], nodes[6]),
         new Edge(5, nodes[3], nodes[7]),
         new Edge(4, nodes[4], nodes[8]),
         new Edge(5, nodes[5], nodes[9]),
         new Edge(3, nodes[6], nodes[7]),
         new Edge(6, nodes[7], nodes[8]),
         new Edge(3, nodes[8], nodes[9]),
         new Edge(6, nodes[6], nodes[10]),
         new Edge(7, nodes[7], nodes[10]),
         new Edge(5, nodes[8], nodes[11]),
         new Edge(9, nodes[9], nodes[11]),
         new Edge(8, nodes[10], nodes[11]),
     };
     Console.WriteLine(string.Join(", ", Kruskal(nodes, edges)));
 }
Exemplo n.º 3
0
        private static IEnumerable<Edge> Kruskal(Vertex[] nodes, Edge[] edges)
        {
            var workingEdges = new Queue<Edge>(edges.OrderBy(e => e.Cost).ToArray());
            var forest = MakeSet(nodes).ToArray();
            Console.WriteLine("Forest: {0}", string.Join<Tree>("|", forest));

            while (1 < forest.Count())
            {
                var edge = workingEdges.Dequeue();
                var vtrees = TreesWith(edge.Ends[0], forest).ToArray();
                var utrees = TreesWith(edge.Ends[1], forest).ToArray();
                if (0 < vtrees.Length && 0 < utrees.Length)
                {
                    forest = MakeUnions(vtrees, utrees, edge, forest).ToArray();
                    Console.WriteLine("Forest: {0}", string.Join<Tree>("|", forest));
                }
            }

            return forest.First().Edges;
        }
Exemplo n.º 4
0
 internal bool Contains(Vertex v)
 {
     return Nodes.Contains(v);
 }
Exemplo n.º 5
0
 private static IEnumerable<Tree> TreesWith(Vertex v, IEnumerable<Tree> forest)
 {
     return from f in forest
            where f.Contains(v)
            select f;
 }