Related Coding / DSA
Longest Strictly Increasing Subsequence
Given a sequence of integers, find the length of the longest subsequence (not necessarily contiguous) whose elements are strictly increasing.
1. Problem Statement
You are given a 2D grid where each cell is land (1) or water (0). Count the number of connected land regions, where connectivity is horizontal or vertical only.
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 adjacency rules and grid mutability before coding.
- Choose an approach that counts each region exactly once in linear time and justify it.
- Think aloud while implementing careful traversal and boundary checks.
- 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
Hidden because they name the technique, which a real interviewer would not tell you.
Show core concepts
Grid TraversalDFS/BFSConnected ComponentsComplexity Analysis
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