What is LeetCode 124 Binary Tree Maximum Path Sum?

It's finding the highest sum path in a binary tree, any start/end nodes, ignoring negative drags.

How to solve LeetCode 124 with recursion?

Helper returns max gain from node down one branch; global tracks full paths through node.

Best visualizer for LeetCode tree problems?

TraceLit — steps code visually, beats mental tracing.

LeetCode 124: Why Tree Path Sums Still Trip Up Veterans

Binary trees. Maximum path sums. LeetCode 124 hits like a bad flashback from 2005 interviews. Here's the no-BS breakdown — with visuals that actually help.

theAIcatchup Apr 09, 2026 4 min read

Step-by-step visualization of Binary Tree Maximum Path Sum algorithm trace

⚡ Key Takeaways

Recursion prunes negatives with max(0, subtree) for efficiency. 𝕏
Global max tracks any path; return is single-branch only. 𝕏
TraceLit visualizes steps, cutting debug time dramatically. 𝕏

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#DFS #LeetCode 124 #Maximum Path Sum #Recursion DFS #binary tree #recursion

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Originally reported by Dev.to

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