Definition: In computer science, a "keystone" is a type of data structure that allows for efficient insertion and deletion operations on a linked list. The key concept in this context is that each node in a linked list contains a pointer to its next node, allowing the insertion or deletion of nodes at any position within the list. In other words, a "keystone" acts as a "link" between two nodes, where one node points to the next node. This allows for efficient access
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