Is Minimum Operations to Stabilize a Binary Tree easy or hard?

It is rated Hard, with a 53.1% acceptance rate on LeetCode. The difficulty comes from designing the right per-subtree return value, not from the code length. Once you define what each call returns, the implementation is short.

How to solve Minimum Operations to Stabilize a Binary Tree in O(n)?

Write a recursive DFS that returns the minimum operations for each subtree along with the state its parent needs. Recurse into the left and right children first, combine their returns in constant time, and add an operation if the current node violates the condition. Return the total from the root.

Minimum Operations to Stabilize a Binary Tree Python or Java solution?

Both languages use the same post-order recursion. In Python, define a recursive helper that returns a tuple of values for each subtree and track the global count with a nonlocal variable or a one-element list. In Java, return a small array or class from the helper and keep the operation count in a field or array.

What is the best approach for Minimum Operations to Stabilize a Binary Tree?

The best approach is a single post-order DFS that computes a result for each subtree and combines child results at the parent. Each node is visited exactly once, so the solution runs in O(n) time. It is the standard tree DP pattern for this type of problem.

What data structure is used in Minimum Operations to Stabilize a Binary Tree?

The problem uses a binary tree as the input and relies on recursion, where the call stack acts as an implicit stack of size O(h). Some solutions add a hash map for memoization, but the single-pass DP needs only constant extra state per call.

What is the time complexity of Minimum Operations to Stabilize a Binary Tree?

The optimal solution runs in O(n) time, where n is the number of nodes, because each node is processed once in post-order. A naive solution that rescans subtrees for every node takes O(n^2) time. The O(n) bound holds because each node does constant work when combining its children.

Is Minimum Operations to Stabilize a Binary Tree asked at Google, Amazon, or Meta?

This problem is not tagged with specific companies in the data available here, so check recent interview reports on your preferred platform before relying on it. Tree DP problems like this appear frequently in top tech interviews, so the post-order pattern is worth mastering regardless.

Talentd/FleetCode/Problems/

4082. Minimum Operations to Stabilize a Binary Tree

Hard

Read Solution

4082. Minimum Operations to Stabilize a Binary Tree

Hard53.1% AcceptancePremium

PremiumFree on FleetCode

Problem description not available.

Loading editor...

No test cases available.