Make a data structure that enables the access and delete actions. If the item isn't already on the data structure, the access action adds it. The object with the least recent access is deleted and returned by the remove operation. Hint: Maintain references to the first and last nodes as well as the items' order of access in a doubly linked list. Use a symbol table where the keys represent the items and the values the links in the list. Remove the element from the linked list after accessing it, then reintroduce it at the start. Delete an element from the end and from the symbol table whenever you remove one.
Make a data structure that enables the access and delete actions. If the item isn't already on the data structure, the access action adds it. The object with the least recent access is deleted and returned by the remove operation. Hint: Maintain references to the first and last nodes as well as the items' order of access in a doubly linked list. Use a symbol table where the keys represent the items and the values the links in the list. Remove the element from the linked list after accessing it, then reintroduce it at the start. Delete an element from the end and from the symbol table whenever you remove one.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Make a data structure that enables the access and delete actions. If the item isn't already on the data structure, the access action adds it. The object with the least recent access is deleted and returned by the remove operation.
Hint: Maintain references to the first and last nodes as well as the items' order of access in a doubly linked list. Use a symbol table where the keys represent the items and the values the links in the list. Remove the element from the linked list after accessing it, then reintroduce it at the start. Delete an element from the end and from the symbol table whenever you remove one.
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