Concept
A stack is a linear data structure where the last inserted item is the first one removed.
Computer Science DSA Lab
Stack Visualizer for Interactive DSA Practice
Explore stack operations by pushing values on top, popping the latest value, and seeing last-in, first-out behavior clearly. Learn the concept, operation flow, complexity, and real-world use cases through a focused OpenLabs interactive visualizer.
DSA Visualizer
LIFO data structure
Push: O(1), Pop: O(1), Peek: O(1)
Step 1
Push value
Step 2
Update top
Step 3
Peek top
Step 4
Pop latest
Operation flow
Stack operations happen at one end called the top. Push adds to the top, pop removes from the top, and peek reads the top item.
Complexity
Push: O(1), Pop: O(1), Peek: O(1)
Visualization
Watch each operation update the structure or algorithm state step by step.
Learn by visualizing
Understand Stack through step-by-step interaction
Stack operations happen at one end called the top. Push adds to the top, pop removes from the top, and peek reads the top item. The lab makes every state change visible, helping students connect DSA theory with practical algorithm behavior.
Understand LIFO behavior and top pointer movement.
Practice push, pop, peek, overflow, and underflow ideas.
Connect stacks with recursion and function calls.
Visualize stack state after every operation.
Where this concept is used
- Function call stack
- Undo and redo actions
- Expression evaluation
- Backtracking algorithms
How the interactive lab works
Open the Stack lab, run the available operation controls, and watch the visual state update immediately. Use the animation to trace the operation order, compare complexity, and verify your understanding.
Curriculum Continuity
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Linked List
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Data StructureEnqueue: O(1)
Queue
Understand queue behavior by adding items at the rear and removing them from the front in first-in, first-out order.
Sorting AlgorithmBest: O(n)
Bubble Sort
Watch bubble sort compare neighboring values, swap them when needed, and move larger values toward the end of the array.
Sorting AlgorithmBest: O(n log n)
Heap Sort
Explore heap sort by building a max heap, moving the root to the sorted region, and heapifying the remaining array.
Sorting AlgorithmBest: O(n)
Insertion Sort
Watch insertion sort build a sorted prefix by picking one key at a time and inserting it into the correct position.
Stack FAQs
What is a stack in DSA?
A stack is a LIFO data structure where the last inserted element is removed first.
What are push and pop?
Push inserts an element on top of the stack, while pop removes the top element.
Where are stacks used?
Stacks are used in recursion, undo systems, expression parsing, browser history, and backtracking.
Ready to practice Stack?
Launch the visualizer, trace each step, and build confidence with data structures and algorithms through hands-on learning.