Coding Interview Prep Roadmap

Codetrails.

Comprehensive, gapless and complete.

With 256 skills and over 1,400 challenges, any goal is within reach.

Even CS majors start from scratch to build a solid base!

Know the syntax but stuck on actual problems? Start here!

Been solving on instinct? Time to learn the concepts!

Can't turn concepts into code? Get hands-on here!

Hitting 'Time Limit Exceeded'? Learn how to break through here!

All the way to real test difficulty — wrap it up right here!

Wondering which level you're at?

Variables & Output

Input Basics

Basic Operators

Conditional Statements

Loops

Nested Loops

Arrays

Two-Dimensional Arrays

Strings

Functions

Recursive Functions

Sorting

Simulation I

Simulation II

Exhaustive Search I

Exhaustive Search II

Exhaustive Search III

Case Work

Ad-Hoc

Time and Space Complexity

Linear Data Structures

Sorting Algorithms

Binary Search

Stack, Queue, and Deque

Tree Structures

Hashing Techniques

Dynamic Programming Basics

Graph Basics

Advanced Graph Algorithms

Advanced Simulation

Backtracking

Depth-First Search

Breadth-First Search

Dynamic Programming I

Dynamic Programming II

Advanced Data Structures

Basic Optimization Techniques

Parametric Search

Greedy Algorithms

Shortest Path Algorithms

Advanced Tree Algorithms

Minimum Spanning Trees

Topological Sort

Fundamental String Algorithms

Advanced Dynamic Programming

Trail1. Novice Low

Foundations of Coding

First 5 chapters free! (147 problems)

Learn the fundamental syntax of various programming languages like C, C++, Python, Java, and JavaScript. This trail provides a solid foundation for coding beginners.

Chapter 9 · Lesson 87 · Problem 396

Trail2. Novice Mid

Algorithmic Foundations

First lesson free

Develop crucial implementation skills and learn to think algorithmically. This trail focuses on cultivating problem-solving strategies, debugging techniques, and the ability to translate ideas into code.

Chapter 10 · Lesson 29 · Problem 241

Trail3. Novice High

Data Structures Fundamentals

First lesson free

Explore fundamental data structures and algorithms crucial for efficient problem-solving. Learn how to select and implement appropriate data structures to optimize your code performance.

Chapter 10 · Lesson 52 · Problem 242

Trail4. Intermediate Low

Practical Algorithm Design

First lesson free

Master the implementation of crucial algorithms such as BFS, DFS, and Dynamic Programming. This trail bridges theoretical knowledge with practical application, enabling you to solve real-world problems efficiently.

Chapter 6 · Lesson 19 · Problem 130

Trail5. Intermediate Mid

Advanced Algorithms I

First lesson free

Dive deeper into advanced algorithmic concepts, focusing on techniques like Two Pointer and Parametric Search. This trail challenges you to optimize solutions and tackle more complex computational problems efficiently.

Chapter 5 · Lesson 18 · Problem 176

Trail6. Intermediate High

Advanced Algorithms II

First lesson free

Elevate your algorithmic skills with complex concepts such as Tree algorithms, Topological Sort, and Disjoint Set. This trail empowers you to handle intricate data structures and algorithms.

Chapter 5 · Lesson 17 · Problem 149

Boost your coding skills efficiently
with a structured curriculum.

Codetrails are carefully designed to maximize learning efficiency,
guiding students through a structured three-stage curriculum:

Concept Explanations & Warm up Exercises

Learn with detailed concept explanations and work through warm-up exercises.

Practice Problems for further strengthening

Reinforce your learning by tackling harder problems.

Test Problems for proofing your skills

Solve problems without solutions to test your understanding.

Not sure where to start?

We’ll measure your skills and curate your curriculum.

Gap Check Recommended Lesson. Free for a limited time.

Introducing a new feature

Mind the

Gap Check!

Take our Gap Check to identify knowledge gaps and get tailored resources to improve your problem-solving.

A Gap Check requires a sign up. Retake the Gap Check any number of times and receive one Learning Lesson at a time.