private IEnumerable <Edge> GetMinimumSpanningTreeEdgesBad(Dictionary <char, List <Edge> > g)
{
var h = new BinaryMinHeap <char>();
var vte = new Dictionary <char, Edge>();
// Fill Heap
var isFirst = true;
foreach (char key in g.Keys)
{
if (isFirst)
{
h.Add(new BinaryMinHeap <char> .Node {
Id = key, Weight = 0
});
isFirst = false;
}
else
{
h.Add(new BinaryMinHeap <char> .Node {
Id = key, Weight = int.MaxValue
});
}
}
var result = new List <Edge>();
while (h.HasItem())
{
var v = h.ExtractMinimum();
vte.TryGetValue(v.Id, out Edge ste);
if (ste != null)
{
result.Add(ste);
}
foreach (Edge e in g[v.Id])
{
char adj = e.V2;
if (!h.Contains(adj))
{
continue;
}
var node = h.GetNode(adj);
if (node.Weight > e.Weight)
{
node.Weight = e.Weight;
h.Decrease(node);
if (!vte.ContainsKey(node.Id))
{
vte.Add(node.Id, e);
}
vte[node.Id] = e;
}
}
}
return(result);
}