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
Project Euler: Problem 10, Sum of Primes
Find the sum of the elements in the "second" diagonal
Back to basics 6 - Column Vector
Find a subset that divides the vector into equal halves
Code breaker, Part II: Operation Orthos
Guess the number I'm thinking of (Part 1)
The other half of the Fibonacci sequence
Just take it easy for a second or two!
The twelve days of Christmas
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