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Leetcode 222. Count Complete Tree Nodes

Given a complete binary tree, return its node count in less than O(n) time by exploiting the tree’s completeness (all full levels except a left-filled last level) to compute subtree heights and identify/count perfect subtrees without visiting every node.

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Google

Amazon

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Late December, 2024

Google

Mid-level

Count Nodes in a tree

Mid November, 2024

Amazon

Junior

Complete Binary Tree Node Count: Find the total number of nodes in a given complete binary tree efficiently.

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