The core logic isn't hard but I fumbled the 10th frame handling for longer than I'd like to admit.
Clarify the input format (e.g., list of rolls or list of frames) and edge cases like the 10th frame. Then design a modular solution with a helper function that scores each frame based on the next two rolls, and iterate through frames while handling strikes and spares. Finally, test with standard cases and discuss time/space complexity.
Pro tip: Mention that you would write unit tests for edge cases like all strikes, all spares, and mixed games to ensure correctness, and discuss how the modular design aids testing and maintainability.
Ask whether the input is a list of rolls (e.g., [10, 3, 7, ...]) or a list of frames, and confirm the output is the total score. Discuss handling of the 10th frame's extra rolls.
Create a function that takes the rolls list and the current index, and returns the score for the current frame along with the next index. It should handle strikes (10 + next two rolls), spares (10 + next roll), and open frames.
Loop over 10 frames, calling the helper function each time to accumulate the total score and advance the index appropriately. Ensure the 10th frame is handled correctly with up to three rolls.
Test with known games: perfect game (300), all spares (150), and a mixed game. Verify edge cases like strikes in the 10th frame.
State that the solution runs in O(n) time where n is the number of rolls (max 21), and O(1) extra space. Discuss potential optimizations or alternative approaches.
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