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.
Project Euler: Problem 10, Sum of Primes
First non-zero element in each column
SET (the card game)
Index of neighbor pixel with steepest gradient
GJam 2013 Veterans: Ocean View (Large)
Image Processing 003: Interferometer Data Interpolation
Hamming Weight - Fast
Mandelbrot Number Test [Real+Imaginary]
USC Spring 2013 ACM: Relief Supplies
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