Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- A hash-map has been constructed with quadratic-hashing. The hashing function is h(k;) = (3 * k; + 7) mod 17 and the table length is N = 17. How many cells will be probed by the call of insert(2) 1 4 5 6 7 8 10 11 12 13 14 15 16 26 89 11 35 70 59 Note: First row contains the indices and the second row contains the items.arrow_forwardplease solve number C I solved numbers a and b so I do not need number a and b Problem (taken from page 308 of the textbook)A parking lot has 31 visitor spaces, numbered from 0 to 30. Visitors are assigned parking spaces usingthe hashing function h(k) = k mod 31, where k is the number formed from the first three digits on avisitor’s license plate.a) Which spaces are assigned by the hashing function to cars that have these first three digits ontheir license plates: 317, 918, 007, 100, 111, 310?b) Describe a procedure visitors should follow to find a free parking space when the space they areassigned is occupied.c) A large parking-systems company would like to automate your assignment procedure forselfparking cars. You have been hired to implement a ”simple” proof-of-concept program in C++, fornow customers will enter their 3 digit plate numbers and your software will assign a parkingspace. Your implementation should a find a free parking space if the original assigned space isoccupied.…arrow_forwardimport 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_forward
- What is simple uniform hashing?a) Every element has equal probability of hashing into any of the slotsb) A weighted probabilistic method is used to hash elements into the slotsc) Elements has Random probability of hashing into array slotsd) Elements are hashed based on priorityarrow_forwardPlease solve thisarrow_forwardQuestion twoarrow_forward
- Given two arrays of integers, write a function to find the intersection of the arrays. The intersection should include only distinct elements and the result should be in sorted order. Solve this problem using the hash set approach.arrow_forwardOpen hashing and closed hashing are two different types of hashing (overflowchaining)Hashing using a closed looparrow_forward- 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)…arrow_forward
- Write the lines of code to insert the key (book's ISBN) and value ("book") pair into "my_hash_table".arrow_forwardvalsTable: o Empty-since-start 1 Empty-after-removal Occupied Hash table valsTable uses double probing with the hash functions hash1(key): key % 11 hash2(key): 5 - key % 5 and a table size of 11. 15 5 27 6. 7 HashInsert(valsTable, item 70) inserts item 70 into bucket Ex: 10 8 9 Hashlnsert(valsTable, item 62) inserts item 62 into bucket 10 Hashlnsert(valsTable, item 59) inserts item 59 into bucket 2. 3.arrow_forwardThe Big O value of hashing is: O a. O(log N) O b. O(N) Oc O(N*Log N) O d. 0(1)arrow_forward
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