Guess the password or break the lock.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
Distance walked 2D
Convert a vector into a number
Magic is simple (for beginners)
Upper triangular matrix
Don't Try, give up and return NaN.
expand intervals vol.2
Pernicious Anniversary Problem
Polite numbers. Politeness.
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