The test suite should check the size of the answer. It seems kind of a cheat to give an answer with 8 characters when the encrypted message has length 10. We can't be sure if the person found the asnwer for the two last characters or not.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
The Tower of Hanoi
Create a dictionary
Back to basics 26 - Keywords
Length of a short side
Don't Try, give up and return NaN.
expand intervals vol.2
How many solutions has this problem?
Pernicious Anniversary Problem
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