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Double-ended Queue (Deque) Data Structure Visualizer

STEM Interactive Visual Learning Program at TEC-Bridge AI

Deque Setup

Deque Operations

Deque Visualization

Front
Rear
Both/Current

Operation Steps

How to Use

  1. Setup: Enter capacity and click "Setup" or use "Random" for sample data
  2. Add Front: Enter value and click "Add Front" to insert at front
  3. Add Rear: Enter value and click "Add Rear" to insert at rear
  4. Remove Front: Click to remove element from front
  5. Remove Rear: Click to remove element from rear
  6. Peek: View front or rear element without removing
  7. Traverse: Visit all elements from front to rear
  8. Reset: Restore original deque state

Double-ended Queue Concept

Deque (Double-ended Queue) allows insertion and deletion at both ends.

Key Characteristics:

  • Operations at both front and rear ends
  • Combines stack and queue functionality
  • Flexible insertion and removal
  • Can be implemented using arrays or linked lists
  • Supports both LIFO and FIFO operations

Purpose & Applications

Why use Deques?

  • Flexible data access patterns
  • Efficient operations at both ends
  • Combines benefits of stacks and queues
  • Supports undo/redo operations
  • Optimal for sliding window problems

Common Applications:

  • Browser history navigation
  • Undo/redo functionality
  • Sliding window algorithms
  • Job scheduling systems
  • Palindrome checking

Time & Space Complexity

Operation Time Complexity Space Complexity
Add Front/Rear O(1) O(1)
Remove Front/Rear O(1) O(1)
Peek Front/Rear O(1) O(1)
Is Full/Empty O(1) O(1)
Traversal O(n) O(1)

Strengths & Limitations

Strengths:

  • Flexible insertion/deletion at both ends
  • Constant time operations
  • Combines stack and queue benefits
  • Efficient for sliding window problems
  • Supports multiple access patterns

Limitations:

  • Fixed capacity in array implementation
  • No random access to middle elements
  • More complex than simple queue/stack
  • Memory overhead for pointer management
  • Cache performance may vary

Deque Code Implementation

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