Контест закончился, давайте пообсуждаем. Как решать C?
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I wonder how checker works on problem E.
Heard of Nim?
The problem won't change much if you replace K with 18 — K. According to the constraints (K <= 18, output length <= 2^9+36) a simple brute force checker should suffice: binom(18,9)*2^9 ≈ 25 millions, a factor of 18 being avoided by bit hacks
to slowww