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This can be solved using the Runner Technique.
Let n1, n2, and n3 be Node variables. Let n1 and n2 = head. Iterate n1 K nodes down the list. If n1.next is null before you have completed the traversal, the list is smaller than K. Once you have iterated K nodes, let n3 = n1. Traverse both n1 and n2 until the n1 is at the end of the list. At this point, n3 is pointing at the Kth node from the head, and n2 is pointing at the Kth node from the tail. Swap the data and you're done.
- lineawayfromepic January 13, 2015