Hash tables are a data structure that efficiently maps keys to values, allowing for fast data retrieval in constant average time complexity, O(1). They achieve this by using a hash function to compute an index into an array of buckets or slots, from which the desired value can be found.

Hash Tables

Hash tables

A data structure is a specialized format for organizing, processing, retrieving, and storing data, enabling efficient access and modification. Choosing the right data structure is crucial for optimizing performance and resource utilization in software applications.

data structure

keys to values

fast data retrieval

constant average time complexity

O(1)

A hash function is a mathematical algorithm that converts an input (or 'message') into a fixed-size string of bytes, typically a hash code. It is widely used in computer science for data indexing, retrieval, and encryption, ensuring data integrity and security.

hash function

An index is a systematic arrangement of data or information, often used to improve the efficiency of data retrieval operations or to provide a reference for analysis. It plays a crucial role in databases, search engines, and financial markets by organizing data in a way that enhances accessibility and interpretability.

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