Engineering managers at Western Digital often evaluate whether a candidate can solve a coding problem and clearly justify the performance of the chosen approach. This question focuses on explaining complexity, not just writing code.
Given a simple algorithmic solution such as finding a target value in a list or checking duplicates in a Western Digital device ID stream, explain the time complexity of your approach.
Your explanation should address:
For example, compare a brute-force nested-loop solution with a hash-table-based solution for duplicate detection.
The interviewer expects a clear Big O explanation, not a proof from formal complexity theory. You should be able to walk through the algorithm step by step, identify the dominant operation, and state both time and space complexity accurately.