A linked list is a data structure in which the elements contain references to the next (and optionally the previous) element. Linked lists offer O(1) insert after and removal of any element with known memory location, O(1) list concatenation, and O(1) access at the front (and optionally back) positions as well as O(1) next element access. Random access and random index insertion/removal have O(n) complexity and are usually unimplemented.
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