Swapping the $k^{th}$ node from the start and the $k^{th}$ node from the end in a singly linked list can be done using different methods. We’ll explore the three-pass, two-pass, and one-pass approaches in detail.

The three-pass approach uses two pointers to find and swap the $k^{th}$ node from the start and end of a linked list. In the first pass, we traverse the list from the head to locate the $k^{th}$ node from the beginning. To determine the $k^{th}$ node from the end, we must first find the total length of the list. We traverse the entire list to calculate its length in the second pass. In the third pass, we identify the $k^{th}$ ...