I thought I had this nailed in the first two minutes and then completely fumbled the Deuce/Advantage transitions.
Start by clarifying requirements and edge cases, then propose a clean state-based solution using two counters and a score mapping, and finally walk through the logic with a concrete example. Emphasize the two-point lead rule at deuce and how to detect game win.
Pro tip: Mention that you would write unit tests for critical sequences like deuce, advantage, and win-by-two, and discuss how the solution could be extended to tiebreaks or sets.
Confirm input format (stream of 'A' or 'B'), output format (score after each point), and rules: standard scoring, deuce, advantage, win by two. Ask about tiebreak or set integration if relevant.
Use two integer counters for points won by each player. Maintain a mapping from 0,1,2,3 to '0','15','30','40'. For deuce/advantage, track the difference in points.
After each point, increment the winner's counter. If both >=3, handle deuce/advantage: if scores equal, 'Deuce'; if one leads by 1, 'Advantage <player>'; if leads by 2, game won. Otherwise, output mapped scores.
Walk through a sample sequence (e.g., A, A, B, A, B, B, A, A) showing scores after each point, including deuce and advantage transitions.
Mention handling of invalid inputs, game already won, and how to test with unit tests covering deuce, advantage, and win-by-two scenarios.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.