void p_queue::push(const value_type& entry, size_type priority)
{
if(used >= capacity)
resize( p_queue::size_type(1.5 * capacity) + 1);
heap[used].data = entry;
heap[used].priority = priority;
++used;
if(used > 1)
{
bool swap;
int temp_used = used;
do
{
if(heap[temp_used - 1].priority > parent_priority(temp_used - 1))
{
swap_with_parent(temp_used - 1);
temp_used = temp_used / 2;
swap = true;
}
else
swap = false;
} while(swap);
}
}
void p_queue::pop()
{
assert(size() > 0);
if(size() == 1)
{
--used;
return;
}
heap[0] = heap[used - 1];
used --;
size_type childIndex = 0;
size_type childPriority = 0;
size_type currentPriority = heap[0].priority;
while(is_leaf(childIndex) == false)
{
childPriority = big_child_priority(childIndex);
if(childPriority >= currentPriority)
{
childIndex = big_child_index(childIndex);
swap_with_parent(childIndex);
}
else
{
break;
}
}
}
void p_queue::push(const value_type& entry, size_type priority)
{
if(capacity <= used)
{
size_type newCapacity = 1 + (capacity * 1.25);
resize(newCapacity);
}
ItemType newItem;
newItem.data = entry;
newItem.priority = priority;
size_type newItemIndex = used;
heap[newItemIndex] = newItem;
++used;
while(newItemIndex != 0)
{
size_type parentIndex = parent_index(newItemIndex);
if(priority <= heap[parentIndex].priority)
{
return;
}
else
{
swap_with_parent(newItemIndex);
newItemIndex = parentIndex;
}
}
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
bubble_to_top(node_pointer p_nd)
{
node_pointer p_parent = parent(p_nd);
while (p_parent != 0)
{
swap_with_parent(p_nd, p_parent);
p_parent = parent(p_nd);
}
}
void p_queue::pop()
{
assert(used > 0);
heap[0].data = heap[used - 1].data;
heap[0].priority = heap[used - 1].priority;
used--;
size_type i = 0;
while( !is_leaf(i) )
{
size_type index = big_child_index(i);
swap_with_parent(index);
i = index;
}
}
void pq_decrease_key( binomial_queue *queue, binomial_node *node,
key_type new_key )
{
node->key = new_key;
binomial_node *current, *parent;
while( node->parent != NULL )
{
parent = node->parent;
current = node;
while( parent->right == current )
{
current = current->parent;
parent = current->parent;
}
if( node->key < parent->key )
swap_with_parent( queue, node, parent );
else
break;
}
if( new_key < queue->minimum->key )
queue->minimum = node;
}