Practice: Linked Lists, Stacks and Queues, Recursion
Now it's time to practice what you learned!
You should have already created your Code Signal account. If you have not done so yet, please follow these
instructions What is CodeSignal and How
to Create Your Account
Tip: Before you dive into the practice tasks, revisit the core competency and guided project videos in
this sprint.
Practice Overview
The following CodeSignal practice modules will test and reinforce your understanding of key data
structures and algorithms covered in this unit:
ACS2M1: Linked Lists Implementation
This module focuses on fundamental linked list operations and concepts:
- Search: Finding specific elements in a linked list
- Insert: Adding new nodes at various positions
- Delete: Removing nodes while maintaining list integrity
- Traversal: Iterating through linked list structures
Key Challenge: Implementing a function to detect cycles in a linked list
Access ACS2M1 Practice Module
ACS2M2: Stacks and Queues
This module tests your ability to implement and use stack and queue data structures:
- Stack Implementation: LIFO (Last-In-First-Out) behavior
- Queue Implementation: FIFO (First-In-First-Out) behavior
- Problem Solving: Using stacks to solve parenthesis matching and other problems
- Circular Queues: Efficient queue implementation with fixed arrays
Key Challenge: Implementing a queue using two stacks
Access ACS2M2 Practice Module
ACS2M3: Recursion Fundamentals
This module explores recursive algorithms and their applications:
- Base Cases: Identifying termination conditions
- Recursive Case: Breaking problems into smaller instances
- Call Stack: Understanding the memory implications of recursion
- Problem Solving: Applying recursion to solve complex problems
Key Challenge: Implementing recursive solutions for tree traversal
Access ACS2M3 Practice Module
Preparation Tips
To maximize your success with these practice modules:
- Review Key Concepts: Ensure you understand the theoretical foundations of each data
structure
- Sketch Algorithms: Before coding, trace through your algorithm on paper with simple
examples
- Test Edge Cases: Consider empty structures, single elements, and boundary
conditions
- Time Management: Allocate approximately 30 minutes per module, starting with areas
you find most challenging
- Analyze Solutions: After completing a challenge, review your solution for potential
optimizations
Getting Started
- Login to CodeSignal
- Click on the task links above
- Select your preferred language
- Click on NEXT to begin
- Agree with the Terms and Pledges and click START
Debugging Tips
If you encounter issues while solving the challenges:
- Print Intermediate Values: Add console output to visualize the state of your data
structures
- Use Simple Test Cases: Verify your solution works on basic examples before tackling
complex ones
- Check Boundary Conditions: Ensure your code handles empty collections and edge
cases
- Review Time/Space Complexity: Some challenges may require optimized solutions
- Take a Break: If stuck, step away briefly and return with fresh perspective
Once all the questions for each task are completed in Code Signal, click on Finish the Test.
Next Steps
After completing these practice modules:
- Review any concepts that proved challenging
- Share and discuss your solutions with peers
- Apply these concepts to solve real-world problems in your projects
Review the related module materials and guided projects: