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... :)
Find common elements in matrix rows
Back to basics 23 - Triangular matrix
Compress strings (not springs)
Scoring for oriented dominoes
07 - Common functions and indexing 5
Polite numbers. N-th polite number.
Arithmetic/geometric sequence, 50/50
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