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The two solutions with the vertical axis denoting time, s the start, f the finish and T the torch The bridge and torch problem (also known as The Midnight Train [1] and Dangerous crossing [2]) is a logic puzzle that deals with four people, a bridge and a torch.
The depiction by Ōkyo shows the tiger family crossing a river, with the mother carrying one cub across the river at a time. This depicts a puzzle equivalent to the puzzle of the wolf, goat, and cabbage, asking how the mother can do this without leaving the leopard cub alone with any of the other tiger cubs. [9]
Well-known river-crossing puzzles include: The fox, goose, and bag of beans puzzle, in which a farmer must transport a fox, goose and bag of beans from one side of a river to another using a boat which can only hold one item in addition to the farmer, subject to the constraints that the fox cannot be left alone with the goose, and the goose cannot be left alone with the beans.
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If crossings from bank to bank are not allowed, then 8n−6 one-way trips are required to ferry n couples across the river; [1], p. 76 if they are allowed, then 4n+1 trips are required if n exceeds 4, although a minimal solution requires only 16 trips if n equals 4. [1], p. 79.
Across the River and into the Trees is constructed so that time is seemingly compressed and differentiated between present and past – as one critic says, "memory and space-time coalesce." [17] To move Cantwell into the extended flashback, Hemingway uses the word "boy" as a bridge between time-present and time-past. The dialogue stays in the ...
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