222. Count Complete Tree Nodes | Leetcode Unlocked - Python

In this video, we break down LeetCode 222: Count Complete Tree Nodes. While counting nodes seems trivial, the challenge here is the constraint: we must solve it in less than linear time O(N). We dive deep into the definition of a Complete Binary Tree versus a Perfect Binary Tree and use these properties to design an optimized O(log squared N) algorithm. By comparing the height of left and right subtrees, we can calculate node counts mathematically using bitwise shifts rather than traversing every single node. This tutorial covers the recursive strategy, time complexity analysis, and provides full code implementations in Python, Java, C++, and JavaScript. Master this tree optimization technique to ace your next technical interview.

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Solution Link:
https://leetcode.com/problems/count-complete-tree-nodes/editorial/

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Видео 222. Count Complete Tree Nodes | Leetcode Unlocked - Python канала Leetcode Unlocked