Sort a Linked List Using Merge Sort

Given the head pointer of a linked list, sort the linked list in ascending order using merge sort and return the new head pointer of the sorted linked list.

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Statement

Merge sort is one of the standard sorting algorithms for a linked list. If the given linked list is 29−>23−>82−>1129 -> 23 -> 82 -> 11, then the sorted (in ascending order) list should be 11−>23−>29−>8211 -> 23 -> 29 -> 82.

Example

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