Which part of the question or example is unclear to you? Is it about the input, the goal, or how to determine the smallest window?

When a candidate asks for clarification, I would first confirm the input format: is it a list of error codes, a string, or a stream? Next, I’d clarify what constitutes a window—does it refer to contiguous indices or any subsequence? Finally, I’d ask how the smallest window is defined: is it the minimal length that contains all distinct codes, or does it involve additional constraints like a maximum allowed frequency? By explicitly asking these questions, I ensure that both parties share the same understanding before diving into the solution.