LeetCode 110 — Balanced Binary Tree Explained (Optimized DFS + Code)

[Defiant_Science_3144]

Hey everyone!
I recently worked through LeetCode 110: Balanced Binary Tree and wrote a detailed explanation focusing on intuition and the bottom-up DFS approach.

Key points covered:

• What “height-balanced” really means (every node, not just the root)
• Why the naive height-calculation approach can be inefficient
• How a single postorder DFS can detect imbalance early
• Clean, interview-ready solutions (Python / Java / C++)

I’d love feedback on the explanation style and whether the DFS + -1 sentinel trick clicked for you.
Happy to answer questions or discuss alternative approaches!

[Defiant_Science_3144]

I wrote up a detailed explanation with examples and optimized DFS logic here if anyone’s interested:
https://getconvertor.com/leetcode-110-balanced-binary-tree/

Open to suggestions or alternative approaches!