/// Identifies two nodes so they become one node.
/// \param u A node of the original graph (this includes nodes of the adaptor).
/// \param v Another node of the original graph (this includes nodes of the adaptor).
/// \return The object representing the merged node. Return value will be either \e u or \e v.
public Node Merge(Node u, Node v)
{
var x = nodeGroups.WhereIs(u);
var y = nodeGroups.WhereIs(v);
if (x.Equals(y))
{
return(x.Representative);
}
unionCount++;
return(nodeGroups.Union(x, y).Representative);
}
