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Questions and Answers
What is the primary function of a hash function?
What is the primary function of a hash function?
What is the hash value of key x in the given hash function?
What is the hash value of key x in the given hash function?
What is the purpose of the hash table data structure?
What is the purpose of the hash table data structure?
What is the relationship between the hash function and the hash table?
What is the relationship between the hash function and the hash table?
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What is a key in the context of hashing?
What is a key in the context of hashing?
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What is the purpose of using a hash function in a hash table?
What is the purpose of using a hash function in a hash table?
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What is a characteristic of the items stored in a hash table?
What is a characteristic of the items stored in a hash table?
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What is the range of values that can be used to index items in a hash table?
What is the range of values that can be used to index items in a hash table?
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What is the term for the result of applying a hash function to a key?
What is the term for the result of applying a hash function to a key?
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What is an advantage of using a hash table data structure?
What is an advantage of using a hash table data structure?
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What are the two main factors that hashing depends on?
What are the two main factors that hashing depends on?
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What is a characteristic of a hash table data structure?
What is a characteristic of a hash table data structure?
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Study Notes
Hashing Components
- Hashing consists of two major components: Hash function h and Hash Table Data Structure of size N.
Hash Function
- A hash function h maps keys (a identifying element of a record set) to a hash value or hash key.
- The hash value or hash key refers to a specific location in the Hash Table.
- Example of a hash function for integer keys: h(x) = x mod N.
- The result of the hash function, h(x), is called the hash value of key x.
Hash Table Data Structure
- A hash table is an array of fixed size containing keys, where records are not stored consecutively.
- Keys and entries are scattered throughout the array, with their place of storage calculated using the key and a hash function.
- A hash table combines the advantages of both arrays and trees.
Hash Function and Collision Resolution
- The two main factors in hashing are the hash function and collision resolution.
- The hash function applies to a key to produce a hashed key.
- A good hash function distributes keys uniformly across the array.
Table Size and Indexing
- Table size is a factor in hashing, with the array indexed from 0 to tablesize-1.
- Each stored item has a data member, called a key, used to compute the index value.
- Keys can be integers, strings, or other data types, such as a name or ID in an employee structure.
Hash Function and Mapping
- The mapping from a key to an index is called a hash function.
- The hash function determines the index value for storing and retrieving items from the hash table.
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Description
Understand the basics of hashing, including hash functions and hash tables, and how they work together to map keys to specific locations.
