A linked list is a linear structure where each node holds a value and a reference to the next node, so inserting or removing an element takes constant time once you hold the node, unlike arrays that must shift elements.
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A linked list is a linear structure where each node holds a value and a reference to the next node, so inserting or removing an element takes constant time once you hold the node, unlike arrays that must shift elements.
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A singly linked list points forward only; a doubly linked list also points backward, easing deletion and reverse traversal.
Two pointers moving at different speeds detect cycles and find the middle node in a single pass.
Linked lists give O(1) inserts at a known node but O(n) random access, the opposite of arrays.
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When you insert or delete often at known positions and rarely need random access by index.
Use fast and slow pointers; if they ever meet, the list has a cycle, an approach known as Floyd's algorithm.
