diff --git a/data-structures/zigzagtraversal_iterative.py b/data-structures/zigzagtraversal_iterative.py
new file mode 100644
index 0000000..fa485b3
--- /dev/null
+++ b/data-structures/zigzagtraversal_iterative.py
@@ -0,0 +1,75 @@
+class Node:
+ """
+ A Node has data variable and pointers to its left and right nodes.
+ """
+
+ def __init__(self, data):
+ self.left = None
+ self.right = None
+ self.data = data
+
+def make_tree() -> Node:
+ root = Node(1)
+ root.left = Node(2)
+ root.right = Node(3)
+ root.left.left = Node(4)
+ root.left.right = Node(5)
+ return root
+
+def zigzag_iterative(root: Node):
+ """
+ ZigZag traverse by iterative method: Print node left to right and right to left, alternatively.
+ """
+ if root == None:
+ return
+
+ # two stacks to store alternate levels
+ s1 = [] # For levels to be printed from right to left
+ s2 = [] # For levels to be printed from left to right
+
+ # append first level to first stack 's1'
+ s1.append(root)
+
+ # Keep printing while any of the stacks has some nodes
+ while not len(s1) == 0 or not len(s2) == 0:
+
+ # Print nodes of current level from s1 and append nodes of next level to s2
+ while not len(s1) == 0:
+ temp = s1[-1]
+ s1.pop()
+ print(temp.data, end = " ")
+
+ # Note that is left is appended before right
+ if temp.left:
+ s2.append(temp.left)
+ if temp.right:
+ s2.append(temp.right)
+
+ # Print nodes of current level from s2 and append nodes of next level to s1
+ while not len(s2) == 0:
+ temp = s2[-1]
+ s2.pop()
+ print(temp.data, end = " ")
+
+ # Note that is rightt is appended before left
+ if temp.right:
+ s1.append(temp.right)
+ if temp.left:
+ s1.append(temp.left)
+
+def main(): # Main function for testing.
+ """
+ Create binary tree.
+ """
+ root = make_tree()
+ print("\nZigzag order traversal(iterative) is: ")
+ zigzag_iterative(root)
+ print()
+
+
+if __name__ == "__main__":
+ import doctest
+
+ doctest.testmod()
+ main()
+
pFad - Phonifier reborn
Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.
Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
Alternative Proxies:
Alternative Proxy
pFad Proxy
pFad v3 Proxy
pFad v4 Proxy