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].
5868 Solvers
Which values occur exactly three times?
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mathematics , probability problem
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Factorial: Unlimited Size : java.math
28 Solvers
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