NEW Hard-Level Algorithm Interview Questions!

We've just expanded our collection with over 10 new hard-level algorithm questions designed to challenge your problem-solving skills and enhance your understanding of complex data structures. These questions will test your software developer and ML engineering skills.

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Spotlight Question: Maximum Path-Sum in Tree

Given a tree root, find the maximum path-sum of any non-empty path.

Dive into this interview question asked by Meta, where you need to find the maximum path-sum of any non-empty path in a binary tree. This question involves creating classes and implementing recursive functions—core skills for any serious coder.

Approach Hints:?

1. TreeNode Class: Define a TreeNode class with attributes val, left, and right to represent each node of the tree.
2. Recursive Depth-First Search (DFS): Utilize a recursive helper function to compute the maximum gain from each node, ensuring to only consider positive gains.
3. Global Variable for Maximum Sum: Use a global variable within the solution class to keep track of the maximum path sum found during the traversal.
4. Calculate Local Maximum Sum: At each node, compute the potential maximum path sum that includes the node and both children, and update the global maximum accordingly.
5. Return the Maximum Path Sum: After traversing all nodes, the global variable will store the maximum path-sum value.

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