-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathtree.py
114 lines (69 loc) · 2.43 KB
/
tree.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
class Node:
def __init__(self,info):
self.info = info
self.left = None
self.right = None
self.level = None
def __str__(self):
return str(self.info)
class searchtree:
def __init__(self):
self.root = None
def create(self,val):
if self.root == None:
self.root = Node(val)
else:
current = self.root
while 1:
if val < current.info:
if current.left:
current = current.left
else:
current.left = Node(val)
break;
elif val > current.info:
if current.right:
current = current.right
else:
current.right = Node(val)
break;
else:
break
def bft(self):
self.root.level = 0
queue = [self.root]
out = []
current_level = self.root.level
while len(queue) > 0:
current_node = queue.pop(0)
if current_node.level > current_level:
current_level += 1
out.append("\n")
out.append(str(current_node.info) + " ")
if current_node.left:
current_node.left.level = current_level + 1
queue.append(current_node.left)
if current_node.right:
current_node.right.level = current_level + 1
queue.append(current_node.right)
print ("".join(out))
def preorder(self,node):
if node is not None:
print (node.info)
self.preorder(node.left)
self.preorder(node.right)
def postorder(self,node):
if node is not None:
self.postorder(node.left)
self.postorder(node.right)
print (node.info)
tree = searchtree()
arr = [15,6,18,3,7,17,19]
for i in arr:
tree.create(i)
print ('Breadth-First Traversal')
tree.bft()
print ('Preorder Traversal')
tree.preorder(tree.root)
print ('Postorder Traversal')
tree.postorder(tree.root)