Hashing PPT

Jun 18, 2015Download as PPT, PDF9 likes23,297 views

This document discusses hashing and different techniques for implementing dictionaries using hashing. It begins by explaining that dictionaries store elements using keys to allow for quick lookups. It then discusses different data structures that can be used, focusing on hash tables. The document explains that hashing allows for constant-time lookups on average by using a hash function to map keys to table positions. It discusses collision resolution techniques like chaining, linear probing, and double hashing to handle collisions when the hash function maps multiple keys to the same position.

CSCE 3110
Data Structures & Algorithm
Analysis
Rada Mihalcea
http://www.cs.unt.edu/~rada/CSCE3110
Hashing
Reading: Chap.5, Weiss

Dictionaries stores elements so that they can be
located quickly using keys.
For eg
A Dictionary may hold bank accounts.
In which key will be account number.
And each account may stores many additional
information.
Dictionaries

How to Implement a Dictionary?
Different data structure to realize a key
Array , Linked list
Binary tree
Hash table
Red/Black tree
AVL Tree
B-Tree

Why Hashing??
The sequential search algorithm takes time
proportional to the data size, i.e, O(n).
Binary search improves on liner search reducing
the search time to O(log n).
With a BST, an O(log n) search efficiency can
be obtained; but the worst-case complexity is
O(n).
To guarantee the O(log n) search time, BST
height balancing is required ( i.e., AVL trees).

Why Hashing?? (Cntd.)
Suppose that we want to store 10,000 students records
(each with a 5-digit ID) in a given container.
· A linked list implementation would take O(n) time.
· A height balanced tree would give O(log n)
access time.
· Using an array of size 100,000 would give O(1)
access time but will lead to a lot of space wastage.

Why Hashing?? (Cntd.)
Is there some way that we could get O(1) access
without wasting a lot of space?
The answer is hashing.

Hashing
Another important and widely useful
technique for implementing dictionaries
Constant time per operation (on the average)
Like an array, come up with a function to map
the large range into one which we can
manage.

Basic Idea
Use hash function to map keys into positions
in a hash table
Ideally
If Student A has ID(Key) k and h is hash
function, then A’s Details is stored in position
h(k) of table
To search for A, compute h(k) to locate
position. If no element, dictionary does not
contain A.

Example
Let keys be ID of 100 students
And ID in form of like 345610.
Now, we decided to take A[100]
And, Hash function is , say , LAST TWO DIGIT
So, 103062 will go to location 62
And same if some one have 113062
Then again goes to the location 62
THIS EVENT IS CALLED COLLISION

Collision Resolution
Chaining
Linear Probe
Double hashing

Hash Functions
A Good Hash function is one which distribute keys
evenly among the slots.
And It is said that Hash Function is more art than a
science. Becoz it need to analyze the data.
Key
Hash
Function Slot

Hash Function(cntd.)
Need of choose a good Hash function
Quick Compute.
Distributes keys in uniform manner throughout the
table.
How to deal with Hashing non integer Key???
1.Find some way of turning keys into integer.
eg if key is in character then convert it into integer using
ASCII
2.Then use standard Hash Function on the integer.

Hash Function (contd.)
Hash code map
Keys Integer
Compression map
Integer A[0….m-1]
The Mapping of keys to indices of a hash table is called a
hash function.
The Hash Function is ussually the composition of two
maps:

Collision Resolution (contd.)
Now, there is two more techniques to deal
with collision
Linear Probing
Double Hashing

Linear probe
Linearprobeinsert(k)
If(table is full)
{error}
probe =h(k)
while(table[probe] is occupied)
{probe = (probe + 1) % m //m is no. of slots
}
Table[probe]=k

Linear Probe(contd.)
If the current location is used, Try the next
table Location.
Used less memory than chaining as one does
not have to store all those link(i.e. address of
others).
Slower than chaining as one might have to
walk along the table for a long time.

Linear probe (contd.)
Deletion in Linear probe

Double Hashing
h1(k) - Position in the table where we first
check for the key
h2(k) – Determine offset when h1(k) is
already occupied
In Linear probing offset is always 1.

Double Hashing (contd.)
Doublehashing insert(k)
If (table is full)
{error
}
Probe=h1(k); offset=h2(k);
While (table[probe] is occupied)
{probe=(probe + offset)%m
}
table[probe]=k;

Hashing is a technique used to uniquely identify objects by assigning each object a key, such as a student ID or book ID number. A hash function converts large keys into smaller keys that are used as indices in a hash table, allowing for fast lookup of objects in O(1) time. Collisions, where two different keys hash to the same index, are resolved using techniques like separate chaining or linear probing. Common applications of hashing include databases, caches, and object representation in programming languages.

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Exploring Code Comprehension in Scientific Programming: Preliminary Insight...University of Hawai‘i at Mānoa

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