Flatten Binary Tree to Linked List Problem

Flatten Binary Tree to Linked List Problem — ExecCode Medium DSA Practice

Solve the Flatten Binary Tree to Linked List problem on ExecCode. Free online medium DSA practice in Arrays - Basics. Write and run code in Java, C++, Python — no signup required to run.

Problem description

Flatten Binary Tree to Linked List. Morris / reverse postorder. For Flatten Binary Tree to Linked List, focus on the exact input variables, return only the requested value, and preserve the required time complexity for the intended pattern.

Examples

Input root = [1, 2, 5, 3, 4, null, 6]; Output [1, null, 2, null, 3, null, 4, null, 5, null, 6]

Constraints

0 ≤ nodes ≤ 10^4

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