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
Find best placement for ordered dominoes (harder)
Side of an equilateral triangle
Check that number is whole number
ASCII Birthday Cake
Anyone for tennis? Your chances of winning a (standard) game
Curve fitting (linear functions) & function handles
Arrange the names in alphabetical order (1)
Arrange the names in alphabetical order (2)
The other half of the Fibonacci sequence
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