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 relatively common elements in matrix rows
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Fibonacci-Sum of Squares
GJam 2017 Kickstart: Leader (Small)
GJam 2014 Rd 1c: Reordering Train Cars (Large)
GJam: 2013 China Event: Name Sorting
Rubik's Cube: 30 Moves or Less : Contest Scoring (Time/Size/Moves)
Mastermind I: Solve all 1296 cases
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