Related Coding / DSA
Count Connected Land Regions in a Grid
Given a 2D grid of land and water cells, count the number of distinct connected land regions, where cells are connected horizontally or vertically.
1. Problem Statement
You are given a list of lowercase words. Group together words that are rearrangements of each other's letters, and return the groups.
2. Live Coding Format
Work in the provided coding workspace while explaining your decisions to the live interviewer. Validation may use inline tests, examples, comments, or a verbal walkthrough.
3. Key Focus Areas
- 1Problem clarification and contract
- 2Approach exploration and optimality
- 3Think-aloud communication and pacing
- 4Implementation correctness
- 5Code quality and language fluency
- 6Tests and dry run
- 7Debugging and self-correction
- 8Complexity analysis
- 9Follow-up performance
4. What Strong Candidates Should Demonstrate
- Clarify grouping semantics, ordering guarantees, and character-set assumptions before coding.
- Explain a naive pairwise baseline and improve it to a near-linear grouping approach.
- Think aloud while implementing readable, correct grouping logic.
- Validate with explicit expected outputs and a top-to-bottom dry run.
- Analyze time and space complexity and pace the core problem to leave room for a coding follow-up.
Want interactive feedback?
Practice this problem in the live coding workspace while the interviewer probes your clarification, implementation, trade-offs, and validation.
Continue to DashboardCore Concepts
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ArraysHash MapsString CanonicalizationComplexity Analysis
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Given a string, find the length of the longest contiguous substring in which no character repeats.
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