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
Knight's Tour Checker
Find the sum of the elements in the "second" diagonal
Back to basics 1 - Saving
Number of 1s in a binary string
Generate a string like abbcccddddeeeee
Anyone for tennis? Your chances of winning a tie-break game
Back to basics: throwing errors / exceptions
Seemingly impossible problem
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Make your own Test Suite (part 1)
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