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].
Create One Large Eye of size N x N Quickly?
Check if number exists in vector
Create a vector whose elements depend on the previous element
GJam: 2013 China Event: Name Sorting
Pandiagonal Prime Magic Square Verification
Unique: Enhanced Performance - Large and Wide Array - Speed Improvement (66% savings)
GJam 2013 China Event: Happy Teams
Find Index of maximum Value and maximum Value of a vector
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