How to Solve Check Completeness of a Binary Tree Problem
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Check Completeness of a Binary Tree
Given the root of a binary tree, determine if it is a complete binary tree. In a complete binary tree, every level, except possibly the last, is completely filled, and all nodes in the last level are ...
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Understanding the Check Completeness of a Binary Tree Problem
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Problem Statement
Given the root of a binary tree, determine if it is a complete binary tree. In a complete binary tree, every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. It can have between 1 and 2h nodes inclusive at the last level h.
Check Completeness of a Binary Tree
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Examples
root = [1,2,3,4,5,6]trueEvery level before the last is full (ie. levels with node-values {1} and {2, 3}), and all nodes in the last level ({4, 5, 6}) are as far left as possible.
root = [1,2,3,4,5,null,7]falseThe node with value 7 isn't as far left as possible.
Constraints
The number of nodes in the tree is in the range [1, 100].1 <= Node.val <= 1000How Interview Coder Helps with Leetcode Problems
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