Whiteboard and Chromebook Coding Proficiency Questions

Coding interview readiness focusing on solving algorithmic problems on a whiteboard or in a minimal IDE/terminal environment (e.g., Chromebook). Emphasis is on problem-solving approach, data structures and algorithms, time and space complexity analysis, correct and efficient implementation under constraints, and effective communication of thought process during interviews.

MediumTechnical

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Given a sorted array that has been rotated at an unknown pivot, implement a function in Java or Python to search for a target value and return its index, or -1 if not found. Example: nums = [4,5,6,7,0,1,2], target = 0 -> 4. Explain how you detect which side is sorted and how you ensure O(log n) time.

EasyTechnical

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On a whiteboard-simulated environment implement a function that given a mutable list of characters representing a sentence reverses the word order in place. Language: Python 3, but assume strings are given as list of chars to allow in-place operations. Example: ['t','h','e',' ','s','k','y'] -> ['s','k','y',' ','t','h','e']. Target: O(n) time, O(1) extra space. Explain your steps clearly before coding.

EasyTechnical

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Given the root of a binary tree, implement a recursive function in Python to compute the sum of all node values. While coding on a Chromebook or whiteboard, explain how you defend against stack depth issues and how you would convert to an iterative traversal if necessary. Provide sample trees and expected sums.

HardTechnical

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Design and implement a thread-safe LRU cache API for a multi-threaded environment in Java. Describe synchronization strategy (locks, concurrent data structures, or lock-free), potential contention hotspots, and how you would test correctness under concurrent access on a Chromebook where you cannot run heavy concurrency tests.

EasyTechnical

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Implement binary search in Java to find the index of a target value in a sorted array of integers. Return -1 if not found. On a Chromebook you may not have arbitrary-precision libraries; handle potential integer overflow in index calculations. Explain correctness and include sample I/O: nums = [1,3,5,7], target = 5 -> 2.

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