示例#1
0
        //delete
        public bool Remove(T value)
        {
            AVLTreeNode <T> current;

            current = Find(value);

            if (current == null)
            {
                return(false);
            }

            AVLTreeNode <T> treeToBalance = current.Parent;

            Count--;

            if (current.Right == null)
            {
                if (current.Parent == null)
                {
                    Head = current.Left;

                    if (Head != null)
                    {
                        Head.Parent = null;
                    }
                }
                else
                {
                    int result = current.Parent.CompareTo(current.Value);

                    if (result > 0)
                    {
                        current.Parent.Left = current.Left;
                    }
                    else if (result < 0)
                    {
                        current.Parent.Right = current.Left;
                    }
                }
            }
            else if (current.Right.Left == null)
            {
                current.Right.Left = current.Left;
                if (current.Parent == null)
                {
                    Head = current.Right;

                    if (Head != null)
                    {
                        Head.Parent = null;
                    }
                }
                else
                {
                    int result = current.Parent.CompareTo(current.Value);

                    if (result > 0)
                    {
                        current.Parent.Left = current.Right;
                    }
                    else if (result < 0)
                    {
                        current.Parent.Right = current.Right;
                    }
                }
            }
            else
            {
                AVLTreeNode <T> leftmost = current.Right.Left;

                while (leftmost.Left != null)
                {
                    leftmost = leftmost.Left;
                }

                leftmost.Parent.Left = leftmost.Right;
                leftmost.Left        = current.Left;
                leftmost.Right       = current.Right;

                if (current.Parent == null)
                {
                    Head = leftmost;

                    if (Head != null)
                    {
                        Head.Parent = null;
                    }
                }
                else
                {
                    int result = current.Parent.CompareTo(current.Value);

                    if (result > 0)
                    {
                        current.Parent.Left = leftmost;
                    }
                    else if (result < 0)
                    {
                        current.Parent.Right = leftmost;
                    }
                }
            }

            if (treeToBalance != null)
            {
                treeToBalance.Balance();
            }
            else
            {
                if (Head != null)
                {
                    Head.Balance();
                }
            }

            return(true);
        }
示例#2
0
 public AVLTreeNode(TNode value, AVLTreeNode <TNode> parent, AVLTree <TNode> tree)
 {
     Value     = value;
     Parent    = parent;
     this.tree = tree;
 }