mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-30 16:31:08 +00:00
104 lines
1.9 KiB
Python
104 lines
1.9 KiB
Python
'''
|
|
A binary search Tree
|
|
'''
|
|
|
|
|
|
class Node:
|
|
|
|
def __init__(self, label):
|
|
self.label = label
|
|
self.left = None
|
|
self.right = None
|
|
|
|
def getLabel(self):
|
|
return self.label
|
|
|
|
def setLabel(self, label):
|
|
self.label = label
|
|
|
|
def getLeft(self):
|
|
return self.left
|
|
|
|
def setLeft(self, left):
|
|
self.left = left
|
|
|
|
def getRight(self):
|
|
return self.right
|
|
|
|
def setRight(self, right):
|
|
self.right = right
|
|
|
|
|
|
class BinarySearchTree:
|
|
|
|
def __init__(self):
|
|
self.root = None
|
|
|
|
def insert(self, label):
|
|
|
|
# Create a new Node
|
|
|
|
node = Node(label)
|
|
|
|
if self.empty():
|
|
self.root = node
|
|
else:
|
|
dad_node = None
|
|
curr_node = self.root
|
|
|
|
while True:
|
|
if curr_node is not None:
|
|
|
|
dad_node = curr_node
|
|
|
|
if node.getLabel() < curr_node.getLabel():
|
|
curr_node = curr_node.getLeft()
|
|
else:
|
|
curr_node = curr_node.getRight()
|
|
else:
|
|
if node.getLabel() < dad_node.getLabel():
|
|
dad_node.setLeft(node)
|
|
else:
|
|
dad_node.setRight(node)
|
|
break
|
|
|
|
def empty(self):
|
|
if self.root is None:
|
|
return True
|
|
return False
|
|
|
|
def preShow(self, curr_node):
|
|
if curr_node is not None:
|
|
print(curr_node.getLabel(), end=" ")
|
|
|
|
self.preShow(curr_node.getLeft())
|
|
self.preShow(curr_node.getRight())
|
|
|
|
def getRoot(self):
|
|
return self.root
|
|
|
|
|
|
'''
|
|
Example
|
|
8
|
|
/ \
|
|
3 10
|
|
/ \ \
|
|
1 6 14
|
|
/ \ /
|
|
4 7 13
|
|
'''
|
|
|
|
t = BinarySearchTree()
|
|
t.insert(8)
|
|
t.insert(3)
|
|
t.insert(1)
|
|
t.insert(6)
|
|
t.insert(4)
|
|
t.insert(7)
|
|
t.insert(10)
|
|
t.insert(14)
|
|
t.insert(13)
|
|
|
|
t.preShow(t.getRoot())
|