What is a good node in LeetCode 1448?

A node where no ancestor (root path) has a strictly greater value. Equals okay.

How to solve LeetCode 1448 good nodes binary tree?

DFS recursion : pass path max, increment if node.val >= max, update max then recurse both children with new max.

Is LeetCode 1448 hard for interviews?

Medium. Trees + path tracking. Practice 10 tree meds first.

LeetCode 1448: Why 'Good Nodes' Expose Tree Traversal Flaws in Interviews

Tech interviews love binary trees. But LeetCode 1448's 'good nodes'—no bigger values on the root path—catches even pros off-guard. Here's the data-driven fix.

theAIcatchup Apr 09, 2026 4 min read

Step-by-step visual DFS trace counting good nodes in binary tree for LeetCode 1448

⚡ Key Takeaways

O(n) DFS tracks path max to count good nodes efficiently. 𝕏
Update max only on good nodes; persist across branches. 𝕏
Mirrors real path-optimization in graphs and queries—interview essential. 𝕏

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theAIcatchup

Community-driven. Code-first.

#DFS Recursion #LeetCode 1448 #Tree Traversal #algorithm visualization #binary tree #good nodes

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Originally reported by Dev.to

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