public void Enqueue(T item)
{
var heap = new PairingHeap <T>(item);
top = PairingHeap <T> .Merge(top, heap, compare);
size++;
}
void MergePairs(List <PairingHeap <T> > l)
{
if (l.Count == 0)
{
return;
}
else if (l.Count == 1)
{
if (root == null)
{
root = l[0].root;
}
else
{
root.item = l[0].root.item;
root.priority = l[0].root.priority;
}
children = l[0].children;
}
else
{
PairingHeap <T> aux = new PairingHeap <T>();
aux.Merge(l[0]);
aux.Merge(l[1]);
PairingHeap <T> aux2 = new PairingHeap <T>();
aux2.MergePairs(l.GetRange(2, l.Count - 2));
aux.Merge(aux2);
if (root == null)
{
root = aux.root;
}
else
{
root.item = aux.root.item;
root.priority = aux.root.priority;
}
children = aux.children;
}
}
bool UpdateKeyInternal(T item, int newPrio, PairingHeap <T> originalHeap)
{
bool equalsRoot = item.Equals(root.item);
if (equalsRoot && (newPrio < root.priority))
{
root.priority = newPrio;
return(true);
}
bool stop = false;
for (int i = 0; !stop && i < children.Count; ++i)
{
equalsRoot = children[i].root.item.Equals(item);
if (equalsRoot)
{
if (newPrio >= children[i].root.priority)
{
return(true);
}
PairingHeap <T> child = children[i];
child.root.priority = newPrio;
if (child.root.priority < root.priority)
{
children.Remove(child);
originalHeap.Merge(child);
}
return(true);
}
else
{
stop = children[i].UpdateKeyInternal(item, newPrio, originalHeap);
}
}
return(false);
}
