Consider a hash table of capacity 4 that uses open addressing with linear probing. This hash table uses a hash function that takes the remainder when the hash code of a string is divided by the capacity of the hash table. (For example, "air" hashes 0.) The hashCode method has been overridden for strings, which simply returns 0 if a string begins with 'a', 1 if it begins with 'b', etc. /** Returns 0 if a String begins with 'a', 1 if it begins with 'b', etc. */ public int hashCode() { return this.charAt(0) - 'a'; } Assume that "apple", and "cherry" have been inserted in this order into the hash table. "guava" is to be inserted into the hash table. (a) Which array slot/index should "guava" be placed? Answer: (b) What is the load factor after "guava" is inserted into the hash table? Answer:

Consider a hash table of capacity 4 that uses open addressing with linear probing. This hash table uses a hash function that takes the remainder when the hash code of a string is divided by the capacity of the hash table. (For example, "air" hashes 0.) The hashCode method has been overridden for strings, which simply returns 0 if a string begins with 'a', 1 if it begins with 'b', etc. /** Returns 0 if a String begins with 'a', 1 if it begins with 'b', etc. */ public int hashCode() { return this.charAt(0) - 'a'; } Assume that "apple", and "cherry" have been inserted in this order into the hash table. "guava" is to be inserted into the hash table. (a) Which array slot/index should "guava" be placed? Answer: (b) What is the load factor after "guava" is inserted into the hash table? Answer:

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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Consider a open bucket hash table and closed bucket hash table in which the keys are student identifiers (strings of 6 digits). Assume the following number of buckets and hash function: m = 100; hash(id) = first two digits of id #. Starting with an empty hash table, show the effect of successively adding the following student identifiers: 000014, 990021, 990019, 970036, 000015, 970012, 970023. Use following function as second hash function hash(id) = last digit of id # Show the effect of deleting 000014 from the hash table. (Java Programming DSA)
Given an empty hash table of size 7 that uses open addressing, the following sequence of keys is to be inserted: 15 17 8 23 3 5 Insert these keys using each of the following approaches. h(x) = x % 7; linear probing 0 1 2 3 4 5 6 2. h(x) = x % 7; quadratic probing 0 1 2 3 4 5 6 3.h(x) = x % 7; double hashing with stepSize = 5 - (x % 5); 0 1 2 3 4 5 6
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Consider an empty hash table of size 7. Draw the table that results after inserting, in the given order,the following key values: {19, 26, 13, 48, 17} when collisions are managed and handled by doublehashing method with function: ?(?,?) = [??(?) + ? ∗ ??(?)] ??? ?, where ℎ1(?) = ? ??? 7and ℎ2(?) = 5 − (? ??? 5).
In Python, implement a hashing table data structure of size 20, which can cope with collisions. Thus, you must implement the closed collision system in its three modes: Linear scanQuadratic scanDouble hashing scan. For halt use halt(k)= (k mod (m - 1)) + 1, where m is the size of the table. The data to be managed are students from a certain university who have a 5-digit registration number and it is unique. In addition, the student has a name, age and address. Create a .txt file with 10 students (one for each line) and have them loaded into your program. Build a menu of options where you can: - Find a student and print his data if found and position in the table. Otherwise print a "Not Found" message.
In Python, implement a hashing table data structure of size 20, which can cope with collisions. Thus, you must implement the closed collision system in its three modes: Linear scanQuadratic scanDouble hashing scan. For halt use halt(k)= (k mod (m - 1)) + 1, where m is the size of the table. The data to be managed are students from a certain university who have a 5-digit registration number and it is unique. In addition, the student has a name, age and address. Create a .txt file with 10 students (one for each line) and have them loaded into your program. Build a menu of options where you can: - Enter a new student. For this option, that only allows entering the 5-digit license plate and that random data is automatically generated for the name, age and address. Return the position where it was entered and if it is not possible to enter it, print a message that explains why the entry was not obtained.
Exercise 1 Consider a hash table of size 13, and assume open addressing with linear probing Show what the hash table will look like after the following items are added in the order shown. 26 54 77 90 27 30 28 52 96 65 What’s the load factor of the hash table after the values above are added? If any of the values cause a collision, indicate which. How many comparisons are needed to find 65 in the table? Briefly explain. How many comparisons are needed to determine that 104 is not in the table? Briefly explain. What’s the hash value computed for the string “dog”? Show your work. Exercise 2 Suppose chaining is used as the method for collision resolution. Part A Show what the hash table will look like after the following items are added in the order shown. 26 54 77 90 27 30 28 52 96 65 How many comparisons are needed to find 65 in the table? How many comparisons are needed to determine that 104 is not in the…
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1. Consider an open hash (that is, one that deals with collisions by using a linked list) with a million entries. The hash algorithm takes 200ns to run, each comparison of objects takes 10ns, and everything else involved in the lookup takes trivial time. How large does the hash table need to be to use less time on chained comparisons than on the initial hash lookup? (Remember that you always have to compare once.)
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