Thanks for the participation!
1863A - Канал was authored by Endagorion and prepared by irkstepanov
1863B - Сортировка разбиением was authored by Endagorion and prepared by ch_egor
1863C - MEX много раз was authored by Endagorion and prepared by amethyst0
1863D - Двухцветные доминошки was authored by Endagorion and prepared by AndreySergunin
1863E - Спидран was authored by Endagorion and prepared by Golovanov399
1863F - Разделяй, считай XOR и властвуй was authored by Endagorion and prepared by ch_egor
1863G - Swaps was authored by Endagorion and prepared by zemen
1863H - Машина Голдберга 3 was authored by Endagorion and prepared by Endagorion, irkstepanov
1863I - Избыточные маршруты was authored by Endagorion and prepared by Endagorion, irkstepanov