Beginner~2h
Sliding Window in Data Structures & AlgorithmsInterview Readiness Check
Process subarrays without recomputation — fixed and variable window patterns for subarray problems.
subarraysubstringwindowmax sumlongest without repeatat most k
Learning path
Try a sample question
Swiggy tracks daily order counts. Find the maximum sum of any 3 consecutive days. Which pattern?
A.Two pointers — converge from both ends
B.Binary search on the sorted counts
C.Fixed sliding window of size k=3 — maintain a running sum, slide right by subtracting the leaving element and adding the entering one
D.Prefix sum for each triplet independently
Sign up free to take the full check and see the answer with an explanation.
What this module tests
- Conceptual understanding of sliding window fundamentals
- Trade-offs and design decisions in real system scenarios
- subarray and substring — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the Sliding Window check →
10 questions · Dimension scoring · AI coach feedback · Shareable result
Test your knowledge — free →No credit card · Takes 10–15 min
Frequently asked questions
- What does the Sliding Window check test?
- The check covers process subarrays without recomputation — fixed and variable window patterns for subarray problems. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for Sliding Window?
- Key concepts include: subarray, substring, window, max sum, longest without repeat, at most k. These frequently appear in data structures & algorithms interviews at product and infrastructure companies.
- How many questions are in the check?
- Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.
- How long does it take to study Sliding Window?
- Most engineers spend around 2 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.
- What prerequisite knowledge do I need before Sliding Window?
- Sliding Window builds on Two Pointers. Complete those first for the best results.
- Is subarray, substring, window covered?
- Yes. The Sliding Window module covers subarray, substring, window among other key concepts. The check includes questions that reflect real data structures & algorithms interview patterns.