Frequently Asked Questions(FAQs) on Hashing
1. What is a Hash function?
Hashing refers to the process of transforming a given key to another value. It involves mapping data to a specific index in a hash table using a hash function that enables fast retrieval of information based on its key.
2. What is a Hash function?
Hash function is a function that takes an input and return a fixed-size string of bytes. The hash function receives the input key and returns the index of an element in an array called a hash table. The index is known as the hash index.
3. What are Hash collisions?
Hash collisions occur when two different inputs passed to the hash function produce the same hash value. The lesser the number of hash collisions, the better the hash function is.
4. What are hash tables?
Hash tables are data structures that use hash functions to map keys to values, allowing for efficient retrieval of data when needed. Hash table maps keys to values using a special function called a hash function. Hash stores the data in an associative manner in an array where each data value has its own unique index.
5. What are some applications of Hashing?
Hashing is used in databases for indexing, disk-based data structures and data compression algorithms. Hashing is also used to store passwords securely by applying a hash function to the password and storing the hashed result, rather than the plain text password.
Introduction to Hashing – Data Structure and Algorithm Tutorials
Hashing refers to the process of generating a fixed-size output from an input of variable size using the mathematical formulas known as hash functions. This technique determines an index or location for the storage of an item in a data structure.
Table of Content
- What is Hashing?
- Need for Hash data structure
- Components of Hashing
- How does Hashing work?
- What is a Hash function?
- Types of Hash functions
- Properties of a Good hash function
- Complexity of calculating hash value using the hash function
- Problem with Hashing
- What is Collision?
- How to handle Collisions?
- Separate Chaining
- Open Addressing
- Linear Probing
- Quadratic Probing
- Double Hashing
- What is meant by Load Factor in Hashing?
- What is Rehashing?
- Applications of Hash Data structure
- Real-Time Applications of Hash Data structure
- Advantages of Hash Data structure
- Disadvantages of Hash Data structure
- Frequently Asked Questions(FAQs) on Hashing
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