Given a Linked List. The Linked List is in alternating ascending and descending orders. Sort the list efficiently.
Input List: 10->40->53->30->67->12->89->NULL Output List: 10->12->30->43->53->67->89->NULL
A Simple Solution is to use Merge Sort for linked List. This solution takes O(n Log n) time.
An Efficient Solution works in O(n) time. Below are all steps.
1. Separate two lists.
2. Reverse the one with descending order
3. Merge both lists.
Below are the implementations of above algorithm.
Given Linked List is 10 40 53 30 67 12 89 Sorted Linked List is 10 12 30 40 53 67 89
Thanks to Gaurav Ahirwar for suggesting this method.
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Improved By : andrew1234