Dynamic Shopping Cart
Implement a resizing array for an e-commerce cart
Coding Exercises
Apply your knowledge with hands-on coding challenges. Each exercise is based on real-world scenarios and includes starter code, test cases, and detailed solutions.
Easy Foundation concepts
Medium Practical applications
Hard Complex systems
Arrays & Strings
3 exercisesText Auto-Complete
Build a search suggestion system using arrays
Image Filter Pipeline
Process images using 2D arrays and transformations
Linked Lists
3 exercisesMusic Playlist Manager
Create a playlist with add, remove, and shuffle features
Browser Tab History
Implement browser-like tab navigation
LRU Cache System
Build a least-recently-used cache for a web server
Stacks & Queues
3 exercisesExpression Calculator
Evaluate mathematical expressions with parentheses
Print Job Scheduler
Manage print jobs with priority queues
Load Balancer
Distribute requests across multiple servers
Trees
3 exercisesFile System Navigator
Navigate directories using tree traversal
Decision Tree Classifier
Build a decision tree for data classification
Database Index Optimizer
Optimize database queries using B-trees
Hash Tables
3 exercisesUser Session Manager
Track user sessions in a web application
Spell Checker
Build a spell checker with word suggestions
Distributed Cache
Implement consistent hashing for distributed systems
Graphs
3 exercisesSocial Network Analyzer
Find connections and mutual friends
GPS Route Planner
Find shortest paths between locations
Network Flow Optimizer
Optimize resource flow in networks
💡 Practice Tips
Start Simple
Begin with easy exercises to build confidence, then progress to more complex challenges.
Think Real-World
Consider how each data structure solves actual problems in software systems.
Analyze Trade-offs
Always consider time/space complexity and when to use each approach.