ArraysLesson 4Free preview
DSA Arrays
This lesson is part of DSA · All levels
Summary
An array is the most basic data structure: a set of elements of the same type that are stored sequentially in memory and accessed through an index that starts from zero. Its main advantage is constant random access, i.e. O(1), to both reading and writing. The weakness, insertion or removal in the middle is relatively expensive because it requires a shift of the element.
Key points
- The array elements are accessed using indexes starting from 0
- Indexed access takes place in constant time
- Inserting or removing the middle requires a shift of the element
- Static array sizes are fixed, while dynamic lists can grow
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