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].
Select every other element of a vector
Return the largest number that is adjacent to a zero
Project Euler: Problem 8, Find largest product in a large string of numbers
Make a simplified barcode
Memory Map File: Access and Update
Kaggle: Planetoid Game of Life - Total Score 0.10
TRON Tourney 000 : Clockwise Wall Hugger
REPMAT Enhancement - Faster for Large Row Replication of Vector
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