def insert(self, val):
root = self.root
if not root:
self.root = make_node(val)
return
node, parent = _find(root, val)
if val < node.value:
node.left = make_node(val, node)
return self.splay(node.left)
node.right = make_node(val, node, right=node.right)
if node.right.right:
node.right.right.parent = node.right
self.splay(node.right)
def insert(self, val):
root = self.root
if not root:
self.root = make_node(val)
return
node, parent = _find(root, val)
if val < node.value:
node.left = make_node(val, node)
return self.splay(node.left)
node.right = make_node(val, node, right=node.right)
if node.right.right:
node.right.right.parent = node.right
self.splay(node.right)
def delete(self, val):
node, parent = _find(self.root, val)
if not node.value == val:
return
if node.left and node.right:
next_node, next_node_parent = next_descendant_in_order(node)
node.value = next_node.value
node, parent = next_node, next_node_parent
# now the node will have at most 1 child (i.e 0 or 1 child)
child = node.left if node.left else node.right
if not parent:
node.left = node.right = None
if child:
child.parent = None
self.root = child
return
if parent.left == node:
parent.left = child
else:
parent.right = child
if child:
child.parent = parent
node.left = node.right = node.parent = None
return self.splay(parent)
def delete(self, val):
node, parent = _find(self.root, val)
if not node.value == val:
return
if node.left and node.right:
next_node, next_node_parent = next_descendant_in_order(node)
node.value = next_node.value
node, parent = next_node, next_node_parent
#now the node will have at most 1 child (i.e 0 or 1 child)
child = node.left if node.left else node.right
if not parent:
node.left = node.right = None
if child:
child.parent = None
self.root = child
return
if parent.left == node:
parent.left = child
else:
parent.right = child
if child:
child.parent = parent
node.left = node.right = node.parent = None
return self.splay(parent)
def find(self, val):
node = _find(self.root, val)[0]
self.splay(node)
if node.value == val:
return node
def find(self, val):
node = _find(self.root, val)[0]
self.splay(node)
if node.value == val:
return node