430. Flatten a Multilevel Doubly Linked List

LeetCodeLinked ListDepth-First SearchDoubly-Linked ListOpen on judge ↗

You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional child pointer. This child pointer may or may not point to a separate doubly linked list, also containing these special nodes. These child lists may have one or more children of their own, and so on, to produce a multilevel data structure as shown in the example below. Given the

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solution.cppC++17

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