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].
Indexed Probability Table
Project Euler: Problem 8, Find largest product in a large string of numbers
Create a square matrix of multiples
Is the paranthesis sequence balanced ?
Spectral Distance - Speed Scoring
Image Processing 004: Zernike Coefficients
Genome Sequence 004: Long 3rd Generation Segment Correction
What is Title of Cody Challenge 42?
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