Kit Library / Computer Science / Data Structures
⚡ Topic Learning KitArray Basics
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What you'll study, topic by topic
Arrays: Fundamentals and Operations
~8 min · full explanation, examples & memory tricks in the app
Try the smart MCQs from this kit
16 questions laddered from warm-up to topper-level, each with an explanation. A taste:
What is an array?
BeginnerShow answer & explanation
A collection of elements of the same data type stored in contiguous memory locations
An array is a fixed-size collection of elements of the same data type stored in contiguous memory locations.
How is an element accessed in an array?
BeginnerShow answer & explanation
By its index
Array elements are accessed using their index, which represents their position in the array.
What is the time complexity to access an element in an array by index?
IntermediateShow answer & explanation
$O(1)$
Accessing an array element by index is a constant time operation because the memory address can be calculated directly.
What is the time complexity to insert an element at the beginning of an array of size $n$?
IntermediateShow answer & explanation
$O(n)$
Inserting at the beginning requires shifting all existing elements one position to the right, which takes linear time.
Study it properly — free, in the app
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