Related Coding / DSA
Count Contiguous Runs Summing to a Target
Given a sequence of integers (possibly negative) and a target sum, count how many contiguous subarrays sum exactly to the target.
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
- 6Handwritten tests 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-comparison baseline and improve to a canonical-key hash map grouping.
- ✓Think aloud while implementing readable, correct grouping logic.
- ✓Validate with explicit expected outputs and a top-to-bottom handwritten dry run.
- ✓Analyze time and space complexity and pace the easy 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.
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ArraysHash MapsString CanonicalizationComplexity Analysis
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Find a Pair Matching a Target
Given a sequence of integers and a target value, return the positions of two distinct entries whose values add to the target.
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Longest Run of Non-Repeating Characters
Given a string, find the length of the longest contiguous substring in which no character repeats.
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Longest Strictly Increasing Subsequence
Given a sequence of integers, find the length of the longest subsequence (not necessarily contiguous) whose elements are strictly increasing.