Split the data into two equal half until we get at most one element in both half. Concept of Sorting Linked Lists Divide: Divide the linked list into two parts about its mid-point. It is important to remember that to sort the list with n elements using bubble sort, you need n-1 iterations. The variable p will be initialized with the start node, while end will be set to None. In the above paragraphs we have discussed how merge sort works so in a similar manner here also we first divide the linked list into two sub-list and then recursively sort the two sub-lists and then finally merge both of them and return the final list.ĭiscussing the algorithm it looks something like this. C++ Program to Sort Linked List using Merge Sort 1. To sort a linked list by exchanging data, we need to declare three variables p, q, and end. Create another class SortList which has two attributes: head and tail.
Step4: Return the final head of the sorted linked list. Create a class Node which has two attributes: data and next. In this tutorial, you will learn about linked lists by writing a method for inserting an. Step3: Call finalMerge() given the arguments new heads of left and right sub-linked lists and store the final head returned after merging. A particularly useful kind of linked list is one that is sorted. It supports enumerators and implements the ICollection interface, consistent with other collection classes in.
Now, moving on to how merge sort works for a linked list, we will first have a look at the simple approach of merge sort on a linked list Approach: Step1: Call divideList() and find the mid node of the given linked list and also divide the list into two halves Step2: Recursively call sortMerge() on both left and right sub-linked list and store the new head of the left and right linked list. This algorithm takes constant time to sort integers into a linked list with nlogm processors and O(loglogm/logt) time using nt processors on the Priority. LinkedList
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