public List <Edge> KruskalMST()
{
List <Edge> minimumSpanningTreeEdges = new List <Edge>();
UnionFindDs unionFindDs = new UnionFindDs(this.V);
//Sort all edges by their weight
this.Edges.Sort();
foreach (var edge in this.Edges)
{
//If tree is built, all vertex are connected, then no need to check more
if (minimumSpanningTreeEdges.Count >= this.V - 1)
{
break;
}
int edgeFromEndPointGroup = unionFindDs.Find(edge.From);
int edgeToEndPointGroup = unionFindDs.Find(edge.To);
if (edgeFromEndPointGroup != edgeToEndPointGroup)
{
minimumSpanningTreeEdges.Add(edge);
unionFindDs.Union(edge.From, edge.To);
}
}
return(minimumSpanningTreeEdges);
}
public bool IsCyclicUsingUnionFind()
{
UnionFindDs unionFind = new UnionFindDs(this.V);
for (int fromVertex = 0; fromVertex < this.V; fromVertex++)
{
foreach (var adjacentVertex in adj[fromVertex])
{
//for each edge , we are running it
int x = unionFind.Find(fromVertex);
int y = unionFind.Find(adjacentVertex.Id);
if (x == y) // in same group (only if both are not -1)
{
return(true); //cycle found
}
else
{
unionFind.Union(fromVertex, adjacentVertex.Id);
}
}
}
return(false);
}
