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 string. Find the length of the longest contiguous substring that contains no repeated characters.
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 character set, case sensitivity, and empty-string behavior before coding.
- ✓Explain a brute-force baseline and improve to a sliding window with a last-seen-index map.
- ✓Think aloud while implementing readable, correct window logic.
- ✓Validate with explicit expected outputs and a top-to-bottom handwritten dry run.
- ✓Analyze time and space complexity and handle a bounded follow-up modification.
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Practice this problem in the live coding workspace while the interviewer probes your clarification, implementation, trade-offs, and validation.
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StringsSliding WindowHash MapsComplexity Analysis
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Find a Pair Matching a Target
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Given a list of lowercase words, group together the words that share the exact same multiset of letters.
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