Signals At The Whiteboard

Spending the first minutes writing thorough comments so the interviewer can follow the code without narration.

After the last line compiles in your head, stepping through a small case by hand and looking for off-by-one errors before saying anything.

Stating the complexity with its cause: "O(n log n), because I sort once and then make a single pass."

Paraphrasing the question back before touching the keyboard.

Asking about value format specifically: empty input, nulls, duplicates, negatives, extremes.

Announcing "done" the moment the final line is written, so the remaining time goes to the next question.