public bool Find(int item)
{
//return Find(item, root);
BSNode temp = root;
while (true)
{
if (temp == null)
{
return(false);
}
if (temp.Data == item)
{
return(true);
}
if (item > temp.Data)
{
temp = temp.RightChild;
}
else
{
temp = temp.LeftChild;
}
}
}
public bool Delete(int item)
{
BSNode temp = root;
while (true)
{
if (temp == null)
{
return(false);
}
if (temp.Data == item)
{
Delete(temp);
return(true);
}
if (item > temp.Data)
{
temp = temp.RightChild;
}
else
{
temp = temp.LeftChild;
}
}
}
private bool Find(int item, BSNode node)
{
if (node == null)
{
return(false);
}
if (node.Data == item)
{
return(true);
}
else
{
//if (Find(item, node.LeftChild))
//{
// return true;
//}
//if (Find(item, node.RightChild))
//{
// return true;
//}
if (item > node.Data)
{
return(Find(item, node.RightChild));
}
else
{
return(Find(item, node.LeftChild));
}
}
}
private void MiddleTraversal(BSNode node)
{
if (node == null)
{
return;
}
MiddleTraversal(node.LeftChild);
Console.Write(node.Data + " ");
MiddleTraversal(node.RightChild);
}
public void Delete(BSNode node)
{
if (node.LeftChild == null && node.RightChild == null)
{
if (node.Parent == null)
{
root = null;
//node = null;//也是不行的
}
else if (node.Parent.LeftChild == node)
{
node.Parent.LeftChild = null;
//node = null;
}
else if (node.Parent.RightChild == node)
{
node.Parent.RightChild = null;
}
return;
}
if (node.LeftChild == null && node.RightChild != null)
{
node.Data = node.RightChild.Data;
node.RightChild = null;
return;
}
if (node.LeftChild != null && node.RightChild == null)
{
node.Data = node.LeftChild.Data;
node.LeftChild = null;
return;
}
BSNode temp = node.RightChild;
while (true)
{
if (temp.LeftChild != null)
{
temp = temp.LeftChild;
}
else
{
break;
}
}
node.Data = temp.Data;
Delete(temp);
}
//添加数据
public void Add(int item)
{
BSNode newNode = new BSNode(item);
if (root == null)
{
root = newNode;
}
else
{
BSNode temp = root;
while (true)
{
if (item >= temp.Data)//放在temp的右边
{
if (temp.RightChild == null)
{
temp.RightChild = newNode;
newNode.Parent = temp;
break;
}
else
{
temp = temp.RightChild;
}
}
else//放在temp的左边
{
if (temp.LeftChild == null)
{
temp.LeftChild = newNode;
newNode.Parent = temp;
break;
}
else
{
temp = temp.LeftChild;
}
}
}
}
}