Interview Course
Learn the intuition behind every core interview pattern.
Animated, step-by-step walkthroughs show you why each approach works, how it connects to the code, and how to apply it to problems you haven’t seen before.
- 187 lessons & activities
- 13 free lessons
- Beginner-friendly
Included with AlgoDrill Pro
Go from understanding a pattern to solving problems on your own.
Build the intuition, recognize when each pattern applies, and practice using it without step-by-step guidance.
- Learn why each algorithm works
- Follow animated, code-linked walkthroughs
- Adapt reusable patterns to new problems
- Get future updates to this course
One payment. Lifetime access.
Free course lessons
- Array and String Mechanics
- Find Maximum and Count Occurrences
- Subarray, Substring, Subsequence, and Subset
- Is Subsequence
- Pointers Moving Inward
- Reverse String
- Valid Palindrome
- Fixed-Size Sliding Windows
- Grumpy Bookstore Owner
- Variable-Size Windows: longest valid range
- Max Consecutive Ones III
- Shortest Valid Window
- Minimum Size Subarray Sum
What you’ll be able to do
- Recognize the right pattern in an unfamiliar problem
- Explain why the approach works
- Start from a proven structure instead of a blank page
- Adapt that structure when the constraints change
- Trace pointers, recursion, graphs, and dynamic programming precisely
- Turn the idea into clean code and analyze its complexity
Learn the pattern, not just the solution
See algorithms in motion, understand how each decision maps to code, and gradually move from guided walkthroughs to independent problem-solving.
- Animated walkthroughs that reveal important state changes
- Explanations tied directly to the code
- Reusable templates that show what stays constant
- Problems that progress from guided to independent solving
- Short checks that test whether you understand why the approach works
Who this course is for
You should know basic programming syntax such as variables, loops, functions, arrays, and strings.
No prior data structures or algorithms experience is required. The course starts with array mechanics and builds toward trees, graphs, heaps, backtracking, dynamic programming, and advanced interview patterns.