# Complete Binary Tree

Given a binary tree `root`

, return whether it’s a complete binary tree.

**Constraints**

`n ≤ 100,000`

where`n`

is the number of nodes in`root`

https://binarysearch.com/problems/Complete-Binary-Tree

## Examples

### Example 1

**Input**

- root =

**Output**

- answer =
`True`

### Example 2

**Input**

- root =

**Output**

- answer =
`True`

### Example 3

**Input**

- root =

**Output**

- answer =
`False`

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