If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Find the sum of all the numbers of the input vector
Convert a vector into a number
Create a vector whose elements depend on the previous element
Find the Oldest Person in a Room
Lights Out 3 - 5x5, 6 moves
Pattern Recognition 1 - Known Unit Length
Fill-a-pix - Solution Checker
Rule of mixtures (composites) - weighted bound
5th Time's a Charm
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