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 number patterns in rows of a matrix...
Rotate Matrix Both Direction (45 Degree)
GJam 2013 Veterans: Hedge
Fifteen Parity Check
Unique - Very Very Large Numbers
GJam 2011 Africa Qualifier C: House, maximum area rectangle
Kurchan Square - Evaluation Function
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