public static Tree Expand(Tree tree, BitSet parent, int node)
{
Tree newTree = new Tree();
Queue<BitSet> queue = new Queue<BitSet>();
queue.Enqueue(tree.Root);
while (queue.Count > 0)
{
BitSet set = queue.Dequeue();
BitSet child;
if (tree.LeftChild.TryGetValue(set, out child))
{
queue.Enqueue(child);
}
if (tree.RightChild.TryGetValue(set, out child))
{
queue.Enqueue(child);
}
if (parent.IsSubsetOf(set))
{
set += node;
}
newTree.Insert(set);
}
newTree.Insert(parent);
newTree.Insert(newTree.Root * node);
return newTree;
}
public static BitSet BreadthFirstSearch(Tree tree)
{
Queue<BitSet> queue = new Queue<BitSet>();
queue.Enqueue(tree.Root);
BitSet prev = null;
while (queue.Count > 0)
{
BitSet node = queue.Dequeue();
BitSet left = null, right = null;
tree.LeftChild.TryGetValue(node, out left);
tree.RightChild.TryGetValue(node, out right);
if (left == null && right == null)
{
prev = node;
}
else
{
if (left != null)
{
queue.Enqueue(left);
}
if (right != null)
{
queue.Enqueue(right);
}
}
}
return prev;
}
public Tree Expand(Tree tree)
{
BitSet parent = tree.Root;
while (parent.Count > 1 && tree.RightChild.TryGetValue(parent, out parent))
{ }
return ReductionRuleHelper.Expand(tree, parent, this.Vertex);
}
/*************************/
// Constructor
/*************************/
// Basic constructor
public GenericSolver(Decomposition decomposition)
{
// The graph and binary decomposition tree that we are working on
_graph = decomposition.Graph;
_tree = decomposition.Tree;
}
public Tree Expand(Tree tree)
{
return ReductionRuleHelper.Expand(tree, tree.Root * this.Twin, this.Vertex);
}
public Tree Expand(Tree tree)
{
return ReductionRuleHelper.Expand(tree, this.Connection, this.Vertex);
}
// Retreives the actual ordering of a certain ordering that will not validate our bound
private static Tree RetrieveTree(Datastructures.Graph graph)
{
Tree tree = new Tree();
Queue<BitSet> queue = new Queue<BitSet>();
queue.Enqueue(graph.Vertices);
while (queue.Count != 0)
{
BitSet a = queue.Dequeue();
tree.Insert(a);
if (_optimalChild[a].IsEmpty) continue;
queue.Enqueue(_optimalChild[a]);
queue.Enqueue(a - _optimalChild[a]);
}
return tree;
}
