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.
Sum of diagonal of a square matrix
Function composition - harder
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Vine Contest 1-D Case Optimization: Board 78
GJam March 2016 IOW: Password Single
Minimum Distance between two N-sided Polygons
USC Fall 2012 ACM : Code Word Minimum Flipped Bits
Unique: Faster 'rows' for large array of uint8
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