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Grokking the Coding Interview Patterns in C++

Flatten Binary Tree to Linked List

Understand how to flatten a binary tree into a linked list in preorder sequence, using the TreeNode class where left pointers are set to NULL and right pointers link to subsequent nodes. This lesson helps you implement the transformation while managing pointer adjustments efficiently.

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Statement

Given the root of a binary tree, the task is to flatten the tree into a linked list using the same TreeNode class. The left child pointer of each node in the linked list should always be NULL, and the right child pointer should point to the next node in the linked list. The nodes in the linked list should be in the same order as that of the preorder traversal of the given binary tree.

Constraints:

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