More tests. A lot of solutions assume that mask has only 2 columns.
Good suggestion. I've added a couple more tests to the suite, including one that has three columns in the logical mask.
Is there a way to just view the solution to this? I've been trying to do this for my own work, and this problem is the only thing I've found that purports to do what I need, but of course it doesn't actually tell me how.
Maximum running product for a string of numbers
Get the area codes from a list of phone numbers
Solving a quadratic equation
Tune your guitar
Sum my indices
High school cafeteria
Increment a number, given its digits
Factorize THIS, buddy
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