Quick Overview

A linked list whose nodes may each carry one side branch, with branches nested like a binary tree, must be flattened into a single doubly linked list with every branch spliced between its parent and the parent's original successor. It tests pointer rewiring, ordering rules for nested branches, and handling very deep nesting.

Flatten a Linked List with Nested Side Branches into One Doubly Linked List

Company: Tesla

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: hard

Interview Round: Onsite

Overview: A linked list whose nodes may each carry one side branch, with branches nested like a binary tree, must be flattened into a single doubly linked list with every branch spliced between its parent and the parent's original successor. It tests pointer rewiring, ordering rules for nested branches, and handling very deep nesting.

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