Kit Library / Computer Science / Data Structures

⚡ Topic Learning Kit

Linear Data Structures: Arrays, Stacks, Queues & Linked Lists

English 17 leveled MCQs 28 flashcards 9 games Free

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💡 Key Idea

Linear Data Structures: One After Another

Elements stand in a line, not a web.

A linear data structure stores elements sequentially, so each element has at most one predecessor and one successor.

↳ Linear structures trade flexibility for simplicity — traversal is one-directional and predictable.

📖 Definition

Array: Contiguous Memory Blocks

Same type, side by side, instant access.

↳ Arrays give the fastest read access but the slowest insert/delete among linear structures.

⭐ Important Fact

Sparse Matrix: Mostly Zeros

When most entries are zero, store smart.

A sparse matrix has far more zero elements than non-zero ones. Storing it as a full 2D array wastes memory.

↳ Sparse matrix representation stores only meaningful (non-zero) data, cutting memory waste.

📖 Smart notes

What you'll study, topic by topic

1

Linear Data Structures: Arrays, Stacks, Queues & Linked Lists

Linear data structures store elements in a sequential order, where each element connects to the next. This topic covers arrays, stacks, queues, and linked lists — their representations, operations, and real-world applica…

  • A linear data structure stores elements in a sequence where each element has at most one predecessor and one successor.
  • Array address formula: $\text{Address}(A[i]) = B + i \times w$, giving $O(1)$ random access.
  • Array insertion or deletion in the middle costs $O(n)$ due to element shifting.

~25 min · full explanation, examples & memory tricks in the app

❓ Leveled MCQ practice

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17 questions laddered from warm-up to topper-level, each with an explanation. A taste:

Which property defines a linear data structure?

Beginner
A Elements are always stored in contiguous memory. B Elements are always ordered by priority. C Each element has at most one predecessor and one successor. D Each element can have many predecessors and successors.
Show answer & explanation

Each element has at most one predecessor and one successor.

A linear data structure stores elements in a sequence where each element has at most one predecessor and one successor. Contiguity is an array property, not a requirement for all linear structures.

Using the formula $\text{Address}(A[i]) = B + i \times w$, what does $w$ represent?

Beginner
A The base address of the array B The index of the element C The size of each element in bytes D The total number of elements
Show answer & explanation

The size of each element in bytes

In the array address formula, $B$ is the base address, $i$ is the index, and $w$ is the width or size of each element in bytes.

A stack follows which order rule?

Beginner
A Random order B Highest priority first C FIFO — First In, First Out D LIFO — Last In, First Out
Show answer & explanation

LIFO — Last In, First Out

A stack inserts and deletes only at the top, so the last element pushed is the first one popped — LIFO.

In a queue, where does insertion take place?

Beginner
A At the front B At the rear C At both ends simultaneously D At the top
Show answer & explanation

At the rear

A queue enqueues at the rear and dequeues from the front, giving FIFO behaviour.

🃏 Flashcards

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