Given a Linked list of size N, the list is in alternating ascending and descending orders. Your task is to complete the function sort() that sorts the given linked list in non-decreasing order.
The function takes a single argument as input the reference pointer to the head of the linked list.
There are T test cases and for each test case the function will be called separately.
For each test case function should return reference pointer to the head of the new linked list.
The task is to complete the function sort() which should sort the linked list in non-decreasing order
Note: Complete the task in constanst auxilliary space.
Expected Time Complexity: O(N)
Expected Auxiliary Space: O(1)
1 <= T <= 100
1 <= N <= 100
0 <= A <= 103
1 9 2 8 3 7
13 99 21 80 50
1 2 3 7 8 9
13 21 50 80 99
Testcase 1: After sorting the given linked list, the list will be as 1-> 2-> 3-> 7-> 8-> 9.
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