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

Solution