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.


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.


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