It appears that Alfonso took 7 minutes to solve this challenge.
very clever simplifications (constant term in linear model is irrelevant, and optimal slope can only take a discrete set of values)
Tobias took at least 2 minutes to solve this challenge with Matlab. An elegant usage of a function and a Matlab optimization function. This solution also crushed the GJam BigDataset in 1.2 seconds.
Test for balanced parentheses
Surface Fit z(x,y)
Make a run-length companion vector
Criss_Cross_000 : Unique elements in a Square array
Prime Sequences: AP-k Minimum Final Value
Slitherlink IV: Recursive (medium size)
PACMAT 04 - Optimized Ghosts, Equal Speed, 10 Lives
Battleship - Seaman Level
Map all the indices of an Array Indices into a Vector giving Index vs Row and Column
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