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... :)
Compress strings (not springs)
Basics: 'Find the eigenvalues of given matrix
Given a 4x4 matrix, swap the two middle columns
Is this triangle right-angled?
Let's get back to school, and create multiplication tables
Pernicious Anniversary Problem
Which permutation is it?
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