/// <summary>
/// Inserts an element into the heap.
/// </summary>
/// <param name="item">The element to insert into the heap.</param>
public void Insert(T item)
{
var idx = this._elements.Length;
this._elements.AddLast(item);
BinaryHeapUtilities.Up(this._elements.AsSpan(), idx, this._comparer);
}
private T RemoveAt(int idx)
{
var item = this._elements[idx];
var lastItem = this._elements.RemoveLast();
if (idx < this._elements.Length)
{
this._elements[idx] = lastItem;
BinaryHeapUtilities.Down(this._elements.AsSpan(), idx, this._comparer);
}
return(item);
}