OK. I figured out the issue with the test suite. Please check the absolute value of the difference when comparing the computed answers to the correct ones. Otherwise, you'll get some really silly answers. (Like this one! :-)
My, you are tricky, James, finding all those loopholes. I've fixed the test suite to check against upper and lower bounds of each answer.
I was just really curious why one of my answers worked when it didn't include a or b. Some experimentation and a lot of (now wrong) solutions narrowed it down. I had to use some of these equations in my senior project at college, so I knew that the dimensions were very important!
Back and Forth Rows
Read a column of numbers and interpolate missing data
Remove NaN ?
Rotate input square matrix 90 degrees CCW without rot90
Length of a short side
Highly divisible triangular number (inspired by Project Euler 12)
Power Times (of the day)
Self-similarity 1 - Every other term
The 5th Root
Lights Out 3 - 5x5, 6 moves
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