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# Last Node in a Complete Binary Tree

Problem Description

You are given the root of a complete binary tree A.
You have to return the value of the rightmost node in the last level of the binary tree.

Try to find a solution with a better time complexity than O(N).

Problem Constraints
1 <= Number of nodes in the binary tree <= 105

Input Format
The first argument is the root of a binary tree A.

Output Format
Return a single integer denoting the value of the rightmost node in the last level of the binary tree.

Example Input
Input 1:

``````A =
1
/
2
``````

Input 2:

``````A =
1
/ \
2   3
``````

Example Output
Output 1:

``````2
``````

Output 2:

``````3
``````

Example Explanation
Explanation 1:

``````There is only a single node in the last level of the binary tree.

Explanation 2:

``````There a two nodes in the last level of the tree.
The rightmost nodes is 3.
``````

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
Hints
• Hint 1
• Solution Approach
• Complete Solution

## Discussion

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