Return an n×n float tensor with 1 on the border and 0 inside.
Input
5
Output
tensor([[1., 1., 1., 1., 1.],
[1., 0., 0., 0., 1.],
[1., 0., 0., 0., 1.],
[1., 0., 0., 0., 1.],
[1., 1., 1., 1., 1.]])
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solve(...)