Related Coding / DSA
Cheapest Route Within a Stop Limit
Given one-way routes between cities each with a cost, find the cheapest total cost from a source city to a destination city using at most k intermediate stops.
1. Problem Statement
You are given the head of a singly linked list and two 1-indexed positions m and n. Reverse the nodes from position m to n in place and return the new head.
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 indexing convention and boundary behavior before coding.
- ✓Explain an extract-and-rebuild baseline and improve to an in-place pointer reversal.
- ✓Think aloud while implementing careful pointer manipulation.
- ✓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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Linked ListsPointer ManipulationComplexity Analysis
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