Related Coding / DSA
Validate Nested Bracket Sequences
Given a string containing round, square, and curly brackets, determine whether every bracket is properly opened and closed in the correct nested order.
1. Problem Statement
You are given a list of integers and a target. Return the indices of two different entries whose values sum to the target.
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 input, output, uniqueness, and no-solution behavior before coding.
- Explain a baseline approach, identify its bottleneck, and select an optimal conventional solution.
- Think aloud while implementing readable, correct code.
- Validate with explicit expected outputs and a top-to-bottom 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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Reverse a Segment of a Linked List
Given the head of a singly linked list and two positions m and n, reverse the nodes from position m to position n in place and return the new head.
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Search in a Rotated Sorted Array
Given an array of distinct integers that was originally sorted ascending and then rotated at an unknown pivot, determine the index of a target value or report that it is absent.
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Fewest Moves to Solve a Sliding Tile Puzzle
Given a small 2-by-3 sliding tile puzzle board with one blank space, find the minimum number of adjacent tile slides needed to reach a specified target arrangement, or report it is unreachable.