See a problem, name the pattern. Multiple choice, recognition only. It is the skill that turns a 45-minute stall into a 5-minute start.
No implementation, no editor: you read the problem and pick the pattern it reduces to. Recognition is the part of the interview that happens in the first two minutes, and it's the part that's easiest to drill in isolation. Cards are drawn with spaced repetition, so the ones you miss come back sooner and the ones you know back off. Progress is kept in your browser.