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I have explained how Postorder Traversal can be implemented using one stack in the video below. Please excuse my speech impediment while watching the video. Thank you for your patience.

Code Implementation:

Java code:

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Python 2 code:

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Must Read Chapters:

• Iterative Preorder Traversal
• Iterative Postorder Traversal
• Powerful Approach of
  Iterative Inorder Traversal
• How to track traversed paths in DFS

Instructor: