Flatten a Multilevel Doubly Linked List Problem

Flatten a Multilevel Doubly Linked List Problem — ExecCode Medium DSA Practice

Solve the Flatten a Multilevel Doubly Linked List problem on ExecCode. Free online medium DSA practice in Linked List. Write and run code in Java, C++, Python — no signup required to run.

Problem description

You are given a doubly linked list with an additional child pointer that may point to a separate doubly linked list. Flatten so all nodes appear in a single-level doubly linked list.

Examples

Input raw = "1-2-3-4-5-6 with 3.child → 7-8-9-10 and 8.child → 11-12"; Output "1-2-3-7-8-11-12-9-10-4-5-6"

Constraints

0 ≤ nodes ≤ 1000 1 ≤ Node.val ≤ 10^5

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