According to the problem statement, we are given a singly linked list, and we need to sort this singly linked list using merge sort. Now, we have a brief understanding of the merge sort algorithm.
In the case of a linked list, we will recursively divide the list into two sub-lists at each step till list size is reduced to one and while backtracking from the recursive call, we have two sorted lists, which will be merged together into a single list by merge operation in linear time. Now we will look at the approach and algorithm, to know how to apply merge sort on a singly linked list. When the two recursive call will return the two sorted list, then we will merge those sorted list into a single list using these below steps.
So, In this blog, we have learned how to apply merge sort on a Singly Linked List. This is an important question when it comes to coding interviews. However, if there are nodes in the linked list, then we use a pointer variable PTR that is set to point to the first node of the list. In Step 3, START is made to point to the next node in sequence and finally the memory occupied by the node pointed by PTR initially the first node of the list is freed and returned to the free pool.
Above algorithm shows procedure to delete the last node from a linked list. Once we reach the last node and the second last node, we set the NEXT pointer of the second last node to NULL, so that it now becomes the new last node of the linked list. The memory of the previous last node is freed and returned back to the free pool.
The above program has various functions like Create linked list, delete a node from the beginning of linked list, adding a node at beiginning etc, I have commented out function's detail and compiled it online here is the output of it.
I hope your concept for linked list is much more clear after reading the above article, if you have any question's feel free to ask it in the comment's section below. Ask a question Contribute an article Questions Articles. Posted By :- Vinnu. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Collectives on Stack Overflow. Learn more. Linked list sorting in C Ask Question. Asked 10 years, 9 months ago. Active 5 years, 5 months ago. Viewed 34k times. Create a list of integers. Print the list. Sort the list.
Free the list nodes. Below is my program's output. Community Bot 1 1 1 silver badge. DestroyerDust DestroyerDust 47 1 1 gold badge 2 2 silver badges 10 10 bronze badges. Tagged as homework since it says its for one of his classes Data Science. Angular 7. Machine Learning. Data Structures.
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