LeetCode 2872 Explained Simply | Maximum Number of K-Divisible Components (Tree DFS Trick)

Описание: n this video, I break down LeetCode 2872 – Maximum Number of K-Divisible Components in a simple and intuitive way.

This problem looks complex at first because it involves trees, divisibility, and components counting — but once you see the core idea, it becomes surprisingly elegant.

What you will learn:

✅ How to use DFS on trees
✅ How to exploit the modulo trick to form valid components
✅ Why post-order traversal is the key
✅ How to identify valid cuts efficiently
✅ Time & space complexity explained clearly

Key Insight:

If the sum of a subtree is divisible by k, we can cut it as a valid component without affecting the rest of the tree.

This video walks you through:

Problem intuition

Step-by-step algorithm

Clean Python solution

Example walkthrough

If you’re preparing for coding interviews or improving your tree problem skills, this is a must-watch!

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