Клуб любителей пораскинуть мозгами
№ 568 комовяжёр на коне
(а) (возможно баян) обойти шахматную доску ходом коня так чтоб в каждой клетке побывать ровно один раз
(б) (сложнее) доказать что доску 4 х N невозможно обойти ходом коня так чтоб в каждой клетке побывать ровно один раз (для любого натурального N)
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