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
Count from 0 to N^M in base N.
Distance walked 2D
Sum the entries of each column of a matrix which satisfy a logical condition.
Back to basics - mean of corner elements of a matrix
Make your own Test Suite (part 3)
Back to basics: throwing errors / exceptions
Anyone for tennis? Your chances of winning a tie-break game
Make your own Test Suite (part 2)
Curve fitting (non-linear functions) & function handles
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