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Grokking the Coding Interview Patterns in Go

Solution: Flatten Binary Tree to Linked List

Explore how to flatten a binary tree into a linked list following preorder traversal using a depth-first search approach. Understand techniques to rearrange nodes in place without extra memory, optimizing for space and time efficiency. This lesson guides you through implementing the algorithm step-by-step to develop a clear, in-place solution.

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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:

  • −100≤-100 \leq
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