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Last modified on May 20, 2026
intermediate
An array is a data structure that consists of a collection of elements, each identified by at least one array index or key. Arrays are used to store multiple values in a single variable, allowing for efficient access and manipulation of data. They are typically implemented as contiguous blocks of memory, enabling constant time complexity O(1) for accessing elements by their index. Arrays can be of fixed size or dynamic size, depending on the programming language and implementation.
Arrays solve several problems, including the need for efficient data storage and retrieval. For example, when implementing a list of student grades, an array can be used to store the grades where each index corresponds to a specific student, allowing for quick access to any student's grade by their index.
In algorithms and data structures, arrays are used to implement various data structures such as lists, stacks, queues, and matrices. They provide a foundation for more complex data structures and algorithms, enabling operations like sorting and searching to be performed efficiently.
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