Practice · 1 of 2
Timed set D-1
CHALLENGE
Difficulty: intermediate+25 XP
No topic label, exam tempo. Diagnosis first: counting machine + backward-looking dedup compose. (XOR is elegant but the exam accepts the pairwise form — and the pairwise form is what you should write under time.)
Press Submit to check your solution.
Back to lesson: Practice: Timed set D