An animal shelter, which holds only dogs and cats, operates on a strictly"first in, first out" basis. People must adopt either the "oldest" (based on arrival time) of all animals at the shelter, or they can select whether they would prefer a dog or a cat (and will receive the oldest animal of that type). They cannot select which specific animal they would like. Create the data structures to maintain this system and implement operations such as enqueue, dequeueAny, dequeueDog, and dequeueCat. You may use the built in Linkedlist data structure.

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
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An animal shelter, which holds only dogs and cats, operates on a strictly"first in, first
out" basis. People must adopt either the "oldest" (based on arrival time) of all animals at the shelter,
or they can select whether they would prefer a dog or a cat (and will receive the oldest animal of
that type). They cannot select which specific animal they would like. Create the data structures to
maintain this system and implement operations such as enqueue, dequeueAny, dequeueDog,
and dequeueCat. You may use the built in Linkedlist data structure. 

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