private void Up(int index)
{
if (index == 0)
{
return;
}
int parentIndex = (index - 1) / 2;
if (m_comparer.Compare(m_array[parentIndex].Key, m_array[index].Key) <= 0)
{
return;
}
HeapItem swap = m_array[index];
while (true)
{
MoveItem(parentIndex, index);
index = parentIndex;
if (index == 0)
{
break;
}
parentIndex = (index - 1) / 2;
if (m_comparer.Compare(m_array[parentIndex].Key, swap.Key) <= 0)
{
break;
}
}
MoveItem(ref swap, index);
return;
}
private void Reallocate()
{
HeapItem[] newArray = new HeapItem[m_capacity * 2];
Array.Copy(m_array, newArray, m_capacity);
m_array = newArray;
m_capacity *= 2;
}
public void Insert(V value, K key)
{
if (m_count == m_capacity)
{
Reallocate();
}
HeapItem item = new HeapItem()
{
Key = key,
Value = value
};
m_array[m_count] = item;
Up(m_count);
m_count++;
}
private void Down(int index)
{
if (m_count == index + 1)
{
return;
}
int left = index * 2 + 1;
int right = left + 1;
HeapItem swap = m_array[index];
while (right <= m_count) // While the current node has children
{
if (right == m_count || m_comparer.Compare(m_array[left].Key, m_array[right].Key) < 0) // Only the left child exists or the left child is smaller
{
if (m_comparer.Compare(swap.Key, m_array[left].Key) <= 0)
{
break;
}
MoveItem(left, index);
index = left;
left = index * 2 + 1;
right = left + 1;
}
else // Right child exists and is smaller
{
if (m_comparer.Compare(swap.Key, m_array[right].Key) <= 0)
{
break;
}
MoveItem(right, index);
index = right;
left = index * 2 + 1;
right = left + 1;
}
}
MoveItem(ref swap, index);
}
private void MoveItem(ref HeapItem fromItem, int toIndex)
{
m_array[toIndex] = fromItem;
}
private void MoveItem(HeapItem <K> fromItem, int toIndex)
{
m_array[toIndex] = fromItem;
m_array[toIndex].HeapIndex = toIndex;
}