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Grokking the Coding Interview Patterns in Python

Flatten Binary Tree to Linked List

Explore how to flatten a binary tree into a linked list in preorder sequence by modifying node pointers. Understand the constraints, problem requirements, and implement a solution that sets left child pointers to null and right child pointers to the next node in preorder.

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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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