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
Flip the main diagonal of a matrix
QWERTY Shift Code Decoder
Are all the three given point in the same line?
Set the array elements whose value is 13 to 0
Divisible by 6
The other half of the Fibonacci sequence
Guess the number I'm thinking of
Arrange the names in alphabetical order (2)
Testing for randomness: uniform distribution of real numbers (distribution checking)
Is input the global variable z?
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