Below is a visualization of a hash map with six buckets (memory spaces). Wha is the load factor of this hash map? Explain how you know. (You may assume that parentheses indicate a LinkedList.) |(79, 35) (16, 89) |(44, 59, 30) (218, 393, 91) (39, 968) |(49, 3, 99)

Below is a visualization of a hash map with six buckets (memory spaces). Wha is the load factor of this hash map? Explain how you know. (You may assume that parentheses indicate a LinkedList.) |(79, 35) (16, 89) |(44, 59, 30) (218, 393, 91) (39, 968) |(49, 3, 99)

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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Concept explainers

Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.

Question

Below is a visualization of a hash map with six buckets (memory spaces). What
is the load factor of this hash map? Explain how you know. (You may assume
that parentheses indicate a LinkedList.)
|(79, 35)
|(16, 89)
|(44, 59,
30)
|(218, 393,
91)
|(39, 968)
|(49, 3, 99)

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We have a poorly designed hash map in which all values have been placed in the same bucket (that is, they are all in the same LinkedList). Explain how this goes against the purpose of utilizing a hash map in the first place.
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We're dealing with a bad hash map in which all of the values are stored in the same container (that is, they are all in the same LinkedList). The purpose of a hash map has been completed.
- In class HashTable implement a hash table and consider the following:(i) Keys are integers (therefore also negative!) and should be stored in the tableint[] data.(ii) As a hash function take h(x) = (x · 701) mod 2000. The size of the table istherefore 2000. Be careful when computing the index of a negative key. Forexample, the index of the key x = −10 ish(−10) = (−7010) mod 2000 = (2000(−4) + 990) mod 2000 = 990.Hence, indices should be non-negative integers between 0 and 1999!(iii) Implement insert, which takes an integer and inserts it into a table. Themethod returns true, if the insertion is successful. If an element is already inthe table, the function insert should return false.(iv) Implement search, which takes an integer and finds it in the table. The methodreturns true, if the search is successful and false otherwise.(v) Implement delete, which takes an integer and deletes it form the table. Themethod returns true, if the deletion is successful and false otherwise.(vi)…
Because of the shoddy way in which the map was built, all of the hash map's contents are contained in a single LinkedList. The hash map's utility is reduced as a consequence.
All of the information for our hash map is kept in a single container called a LinkedList because of the way the map was built. Because of this, a hash map's utility is reduced.
Due to the way the map was constructed, all of the data for the hash is stored in a single container, a LinkedList. This decreases a hash map's usefulness.
In this task, two hash tables should should be implemented. You can follow the followinginstructions:- In class HashTable implement a hash table and consider the following:(i) Keys are integers (therefore also negative!) and should be stored in the tableint[] data.(ii) As a hash function take h(x) = (x · 701) mod 2000. The size of the table istherefore 2000. Be careful when computing the index of a negative key. Forexample, the index of the key x = −10 ish(−10) = (−7010) mod 2000 = (2000(−4) + 990) mod 2000 = 990.Hence, indices should be non-negative integers between 0 and 1999!(iii) Implement insert, which takes an integer and inserts it into a table. Themethod returns true, if the insertion is successful. If an element is already inthe table, the function insert should return false.(iv) Implement search, which takes an integer and finds it in the table. The methodreturns true, if the search is successful and false otherwise.(v) Implement delete, which takes an integer and deletes it…
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Poor hash mapping means that every value is stored in the same place (that is, they are all in the same LinkedList). A hash map has failed in its intended purpose.