DSAverse
Basics & Data Structures
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Array Access
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5array[0..5]indexed access
Array
Stack
Queue
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Sorting
Trees
Graphs
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Basics & Data Structures
Loading Data Structures...
Array Access
Array
Stack
Queue
Master the fundamental building blocks of computing — stacks, queues, and lists. Each page includes interactive visualizations, step-by-step explanations, and active recall quizzes.
Each includes interactive operations, color-coded animations, and a quiz to test retention.
LIFO with fixed-size array. Push, pop, and peek in O(1).
LIFO using dynamic linked nodes. No overflow — grows with memory.
FIFO with circular array. Enqueue at rear, dequeue at front.
FIFO with front+rear pointers. True O(1) for both ends.
Resizable array that doubles capacity when full. O(1) access.
Dynamic nodes with pointers. Efficient head insert/delete.
Bidirectional nodes with prev + next pointers. O(1) tail delete and backward traversal.
Tail's next wraps to head — no NULL. Ideal for round-robin and circular buffers.
Bidirectional + circular — the most powerful variant. No NULL pointers anywhere.
Stacks, queues, and lists appear everywhere — from your browser's back button to operating system schedulers and compiler parsers.
Foundation — for trees, graphs, and advanced algorithms
Interview staple — asked in virtually every technical interview
Performance — choosing the right structure changes O(n) to O(1)
Choose the right implementation for your use case
| Property | Array | Linked List |
|---|---|---|
| Memory Layout | Contiguous | Scattered nodes |
| Random Access | O(1) | O(n) |
| Insert at head | O(n) shift | O(1) |
| Cache Performance | Excellent | Poor |
| Memory per element | Value only | Value + pointer |
| Max size | Fixed / grows | Unlimited (RAM) |