Black couple bringing new furniture into a new house
2025-02-05 898词 中等
The rules of the problem, which Canadian mathematician Leo Moser first formally posed in 1966, involve a rigid shape—so the cushions don’t yield when pressed—turning a right angle in a hallway. The sofa can be any geometric shape; it doesn’t have to resemble a real couch. Both the shape and the hallway are two-dimensional. Imagine the sofa weighs too much to lift, and you can only slide it.
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