I am sure there are other more subtle ways to go about it but this seems about as fast as I can make it for a general brute-force solution (0.11s)
This one seems to work for the large test case, too, although it is not a general solution [for size(p,1)>100 it only tests corner points].
Find common elements in matrix rows
Remove the small words from a list of words.
Convert a vector into a number
Path of least resistance
Count up then down
Knots Contest: Minimum Knots (ContestSuite)
Image Processing 2.1.1 Planck Integral
Hamming Weight - Fast
Criss_Cross_000 : Unique elements in a Square array
GJam 2017 Kickstart: Parentheses (Small)
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