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 the longest sequence of 1's in a binary sequence.
2 b | ~ 2 b
Is this matrix orthogonal?
Who has power to do everything in this world?
expand intervals vol.2
Arithmetic/geometric sequence, 50/50
Packing oranges - one layer
Alternative Scoring. Create an incremental spiral.
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