Flattening a Linked List
Hard Problems of Linked List DSA practice problem on Onlearn.
Difficulty: hard.
Topics: Flattening a multilevel linked list with sorted child lists into a single sorted linked list, Linked List, Node, Pointer, Recursion, Merge Sort, Brute Force, Time Complexity, Space Complexity, Sorting, Arrays, space complexity, sorting algorithms, general programming, time complexity analysis, merging sorted structures, recursion, linked list, Node, Merging Sorted Data.
Flatten a Multilevel Linked List Problem Statement Given a linked list where every node in the main list contains two pointers: a next pointer pointing to the next node in the main list, and a child pointer pointing to the head of a sub linked list. These sub linked lists are also linked by child pointers and are sorted in ascending order. Your task is to flatten this multilevel linked list into a single, sorted linked list. All nodes in the final flattened list should be connected using their child pointers, and their next pointers should be set to null. Input Specification The input is the head node of the main linked list. Output Specification Return the head node of the flattened and sorted linked list. Constraints N is the number of head nodes along the next pointer. M is the maximum number of nodes along the child pointer for any head node. Node data values are integers. Sample Test Case Input: (Graphical representation of the input list): Expected Output: