LeetCode 145. Binary Tree Postorder Traversal in Java (Iterative Solution)

00:00 - Introduction
00:07 - Whiteboard Walkthrough
05:18 - Edge Cases
07:34 - Java Code Implementation
12:30 - Conclusion

Welcome to LeetCode LevelUp!

In today’s video, we’ll tackle LeetCode Problem 145: Binary Tree Postorder Traversal in Java. This classic problem focuses on tree traversal techniques, with a specific focus on postorder traversal using an iterative approach. We’ll discuss how to navigate a binary tree from left to right and then process the root, which is useful for various applications in tree data structures.

We’ll cover:

The problem breakdown and insights into solving it iteratively.
Whiteboard walkthrough explaining how the traversal is managed with two stacks.

Detailed Java code implementation for a non-recursive solution using two stacks for efficient order processing.

Key edge cases, including handling empty trees and nodes with only left or right children.

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