Flatten a binary tree to Linked List in CPP

[JIsaacSamuel]

Information about Algorithm

We are given a root of the binary tree, and the given binary tree needs to be flattened into a linked list:
Here are the rules which are followed while converting it into a linked list:

• The "linked list" should use the same TreeNode class where the right child pointer points to the next node in the list and the left child pointer is always null.

• The "linked list" should be in the same order as a [pre-order traversal] of the binary tree.

Have you read the Contributing.md and Code of conduct

• Yes
• No

Other context

An interview question.

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[JIsaacSamuel]

hey @ming-tsai, I would love to work on this issue. Do add hacktoberfest label. Thanks in advance.

[ming-tsai]

hey @ming-tsai, I would love to work on this issue. Do add hacktoberfest label. Thanks in advance.

Please read the issue #968

[Mudit-Jxin7]

Hi I would like to contribute to this issue if anyone else is not working on it