A linked list is a data structure that consists of a sequence of nodes, where each node contains data and a reference to the next node. A node represents an element of the list.

This is a doubly-linked list, as shown above. It does many of the common things we would want a linked list class to be able to do. One innovation I added is the concept of a node cache. That is, the ...

# Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. # If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it ...