test 8 is not a symmetric matrix, is it a projector matrix?
Sorry about that one. I've removed that test case. I don't know how long it will take for the re-scoring to propagate, though.
Most nonzero elements in row
Back to basics 11 - Max Integer
Are all the three given point in the same line?
Side of an equilateral triangle
Large Sum (inspired by Project Euler 13)
Equation Times (of the day)
Lights Out 5 - 5x5, 10 moves
Divisible by n, prime divisors from 20 to 200
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