Pairwise swap elements of a linked list
Easy Accuracy: 43.06% Submissions: 51243 Points: 2

Given a singly linked list of size N. The task is to swap elements in the linked list pairwise.
For example, if the input list is 1 2 3 4, the resulting list after swaps will be 2 1 4 3.

Example 1:

Input:
LinkedList: 1->2->2->4->5->6->7->8
Output: 2 1 4 2 6 5 8 7
Explanation: After swapping each pair
considering (1,2), (2, 4), (5, 6).. so
on as pairs, we get 2, 1, 4, 2, 6, 5,
8, 7 as a new linked list.

Your Task:
The task is to complete the function pairWiseSwap() which takes the head node as the only argument and returns the modified head.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(1).

Constraints:
1 <= N <= 103

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