Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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.
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- struct search_within_hash_table { // Function takes no parameters, searches a hash table for a book with an ISBN // matching the target ISBN, and returns a pointer to that found book if such // a book is found, nullptr otherwise. Book* operator()(const Book& unused) { //// TO-DO (21) ||| (/ //// // Write the lines of code to search for the Book within "my_hash_table" // with an ISBN matching "target_isbn". Return a pointer to that book // immediately upon finding it, or a null pointer when you know the book is // not in the container. // // NOTE: Do not implement a linear search, i.e., do not loop from beginning // to end. ///// END-TO-DO (21) |||// //// } std::unordered_map& my_hash_table; const std::string target_isbn; };arrow_forwardIn java, how do I implement the following methods into a linkedlist class. 1) removeLast() – remove the last number of the list 2) removeLeast()- remove least number in the list 3) removeMax()- remove largest number in the list 4) removeFirst() – remove the first number of the list 5) addNum()- add another number to the listarrow_forwardpackage hashset; import java.util.Iterator; public class MySet { // implements a set using a separate chaining hash table privateclass Node { private Integer element; private Node next; private Node(Integer e, Node n) { element = e; next = n; } } private Node table[]; //an array of linked list privateinttableSize; //current number of lists in the table privateintnumElements; //number of elements in the set privatefinalintprimes[] = {7, 23, 59, 131, 271, 563, 1171, 2083, 4441, 8839, 16319, 32467, 65701, 131413, 263983, 528991}; privateintprimeIndex; //last prime used publicint getSize() { returntableSize; } privateint nextPrime(intp) { //finds the next prime from the list above //used for resizing and the initial size while (primes[primeIndex] <= p) primeIndex++; returnprimes[primeIndex]; } public MySet(ints) { //s is a hint for the initial size primeIndex = 0; tableSize = nextPrime(s); table = new Node[tableSize]; numElements = 0; } //return the hash function…arrow_forward
- Our hash map data is saved as a LinkedList due to improper map building. This makes hash maps less helpful.arrow_forwardA substandard hash map contains each value in a single container, or LinkedList. Hash maps are functional.arrow_forwardA map has the form Map <k,v> where: K: specifies the type of keys maintained in this map.V: defines the type of mapped values.Furthermore, the Map interface provides a set of methods that must be implemented. In this section, we will discuss about the most famous methods: clear: Removes all the elements from the map.containsKey: Returns true if the map contains the requested key.containsValue: Returns true if the map contains the requested value.equals: Compares an Object with the map for equality.get: Retrieve the value of the requested key.entrySet: Returns a Set view of the mappings contained in this map.keySet: Returns a Set that contains all keys of the map.put: Adds the requested key-value pair in the map.remove: Removes the requested key and its value from the map, if the key exists.size: Returns the number of key-value pairs currently in the map. Here is an example of TreeMap with a Map: import java.util.Map; import java.util.TreeMap; public class TreeMapExample {…arrow_forward
- import hashlib def hash_function(password, salt, al): if al == 'md5': #md5 hash = hashlib.md5(salt.encode() + password.encode()) hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif (al == 'sha1'): #sha1 hash = hashlib.sha1() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'sha224': #sha224 hash = hashlib.sha224() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'sha256': #sha256 hash = hashlib.sha256() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'blake2b': #blake2b512 hash = hashlib.blake2b() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt else: print("Error: No Algorithm!") if __name__ == "__main__": # TODO: create a list called hash_list that contains # the five hashing algorithsm as strings # md5, sha1, sha224, sha256, blake2b hash_list =…arrow_forwardFor the Queue use the java interface Queue with the ArrayDeque classFor the Stack use the java Deque interface with the ArrayDeque classFor the LinkedList, use the java LinkedList class Also, when you are asked to create and use a Queue, you can use only those methods pertaining to the general operations of a queue (Enqueue: addLast, Dequeue: removeFirst, and peek() Similarly, when you are asked to create and/or use a stack, you can use only those methods pertaining to the general operations of a Stack (push: addFirst, pop:removeFirst, and peek() ) Your code should not only do the job, but also it should be done as efficiently as possible: fast and uses no additional memory if at all possible Questions Write a method “int GetSecondMax(int[] array)” . this method takes an array of integers and returns the second max value Example: if the array contains: 7, 2, 9, 5, 4, 15, 6, 1}. It should return the value: 9arrow_forwardAs far as I know, there is no difference between Array lists and Hash tables.arrow_forward
- A map is a container that stores a collection of ordered pairs, each pair consists of a key and a value, <key, value>. Keys must be unique. Values need not be unique, so several keys can map to the same values. The pairs in the map are sorted based on keys. Group of answer choices True Falsearrow_forwardIn C++ create a hash table that stores char.arrow_forward* QueueArrayList.java This file implements QueueInterface.java This file has * only one ArrayList<T> type of attribute to hold queue elements. One default * constructor initializes the ArrayList<T> queue. An enqueue method receives an * object and place the object into the queue. The enqueue method does not throw * overflow exception. A dequeue method returns and removes an object from queue * front. The dequeue method will throw exception with message "Underflow" when * the queue is empty. A size method returns number of elements in the queue. A * toString method returns a String showing size and all elements in the queue. Please help me in javaarrow_forward
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