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Commit a102679

Browse files
added iterative method to traverse binary tree
1 parent 99a8184 commit a102679

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2 files changed

+55
-9
lines changed

2 files changed

+55
-9
lines changed

‎.gitignore

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1 +1,2 @@
1-
*.json
1+
*.json
2+
myspace.py

‎binary_tree.py

Lines changed: 53 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
#binary tree using LinkedList
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class Node:
3-
def __init__(self, key) :
4-
self.val=key
3+
def __init__(self, data) :
4+
self.data=data
55
self.left=None
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self.right=None
77

@@ -12,15 +12,15 @@ def print_inorder(root):
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print_inorder(root.left)
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# print data of node
15-
print(root.val)
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print(root.data, end=" ")
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# recur on the right child
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print_inorder(root.right)
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2020
def print_preorder(root):
2121
if root:
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# first print data of node
23-
print(root.val)
23+
print(root.data, end=" ")
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2525
# recur on left child
2626
print_preorder(root.left)
@@ -38,7 +38,46 @@ def print_postorder(root):
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print_postorder(root.right)
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# print data of node
41-
print(root.val)
41+
print(root.data, end=" ")
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'''
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1) Create an empty stack S.
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2) Initialize current node as root
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3) Push the current node to S and set current = current->left until current is NULL
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4) If current is NULL and stack is not empty then
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a) Pop the top item from stack.
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b) Print the popped item, set current = popped_item->right
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c) Go to step 3.
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5) If current is NULL and stack is empty then we are done.
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'''
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# iterative inorder traversal with stack
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def in_order(root):
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56+
# initialize current with root
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current=root
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# initialize stack
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stack=[]
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while True:
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# reach the leftmost node of the current node
63+
if current is not None:
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# add current node into the stack
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stack.append(current)
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# goto left of cuurent
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current=current.left
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# if current is empty and stack is not empty then
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elif stack:
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# pop out the stack element and make current to the popped out element
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current=stack.pop()
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#print the popped item
74+
print(current.data, end=" ")
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# set current to right of popped item
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current=current.right
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# if current and stack both are empty then we are done
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else:
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break
4281

4382

4483
root=Node(1)
@@ -57,12 +96,18 @@ def print_postorder(root):
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5897
'''
5998

60-
print("Inorder TRaversal:")
99+
print("Inorder Traversal using recursive method:")
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print_inorder(root)
101+
print()
62102

63-
print("Preorder Traversal")
103+
print("Preorder Traversal using recursive method:")
64104
print_preorder(root)
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print()
65106

66-
print("Postorder Traversal")
107+
print("Postorder Traversal using recursive method:")
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print_postorder(root)
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print()
68110

111+
print("Inorder Traversal using iterative method: ")
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in_order(root)
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print()

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