The principal benefit of a linked list over a conventional array is that the list elements can be easily inserted or removed without reallocation or reorganization of the entire structure because the data items need not be stored contiguously in memory or on disk, while restructuring an array at run-time is a much more expensive operation. They can be used to implement several other common abstract data types, including lists, stacks, queues, associative arrays, and S-expressions, though it is not uncommon to implement those data structures directly without using a linked list as the basis. Linked lists are among the simplest and most common data structures. Arrays have better cache locality compared to linked lists. Faster access, such as random access, is not feasible. A drawback of linked lists is that access time is linear (and difficult to pipeline). More complex variants add additional links, allowing more efficient insertion or removal of nodes at arbitrary positions. This structure allows for efficient insertion or removal of elements from any position in the sequence during iteration. In its most basic form, each node contains: data, and a reference (in other words, a link) to the next node in the sequence. It is a data structure consisting of a collection of nodes which together represent a sequence. Instead, each element points to the next. ![]() ![]() In computer science, a linked list is a linear collection of data elements whose order is not given by their physical placement in memory. The last node is linked to a terminator used to signify the end of the list. A linked list is a sequence of nodes that contain two fields: an integer value and a link to the next node.
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