FYI: The fastest solution mentioned at the problem description uses a lookup-table. Don't beat yourself too much.
Hello, William. I like very much the originality & especially the efficiency of your approach here. Am I correct in thinking that the existing code would struggle to correctly decode a message that was encoded from (say) "Beware of the Sasquatch Man's involvement in Operation Phoenix"? [I don't want to explain this, to avoid giving too many clues to others. But I hope you get my point.] Although I am confident you could tweak your code (if necessary) to handle such cases. —DIV
Set some matrix elements to zero
Split a string into chunks of specified length
Divisible by n, prime divisors (including powers)
Sums of Multiple Pairs of Triangular Numbers
Make your own Test Suite (part 1)
Code breaker, Part II: Operation Orthos
Back to basics: throwing errors / exceptions
What score did they give?
Comparison of floating-point numbers (singles)
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