private void Link(FibHeapNode <T> y, FibHeapNode <T> x)
{
min = RemoveNode(min, y);
y.Parent = x;
y.RightSibling = y;
y.LeftSibling = y;
x.Child = ConcatenanteNode(x.Child, y);
x.Degree++;
y.Mark = false;
}
private FibHeapNode <T> RemoveNode(FibHeapNode <T> list, FibHeapNode <T> node)
{
if (node.LeftSibling == node)
{
return(null);
}
node.LeftSibling.RightSibling = node.RightSibling;
node.RightSibling.LeftSibling = node.LeftSibling;
return(list);
}
public void DecreaseKey(FibHeapNode <T> node, T key)
{
if (key.CompareTo(node.Key) > 0)
{
throw new Exception("new key cant be larger than previous key");
}
node.Key = key;
var y = node.Parent;
if (y != null && node.Key.CompareTo(y.Key) < 0)
{
Cut(node, y);
CascadingCut(y);
}
if (node.Key.CompareTo(min.Key) == 0)
{
min = node;
}
}
private void Consolidate()
{
int arraySize = (int)(Math.Floor(Math.Log(nodeCount) / Math.Log(phi))) + 1;
var array = new FibHeapNode <T> [arraySize];
if (min != null)
{
foreach (var node in min.SiblingsList)
{
var x = node;
int d = x.Degree;
while (array[d] != null)
{
var y = array[d];
if (x.Key.CompareTo(y.Key) > 0)
{
var tmp = x;
x = y;
y = tmp;
}
Link(y, x);
array[d] = null;
}
array[d] = x;
}
}
min = null;
for (int i = 0; i < array.Length; i++)
{
if (array[i] != null)
{
min = ConcatenanteNode(min, array[i]);
if (min == null || array[i].Key.CompareTo(min.Key) < 0)
{
min = array[i];
}
}
}
}
public FibHeap()
{
min = null;
nodeCount = 0;
}