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 peak 3n+1 sequence value
Find perfect placement of non-rotating dominoes (easier)
Getting the row and column location from a matrix
Number of Horns on a unicorn!
Magic is simple (for beginners)
Best Problem Elections
Polite numbers. N-th polite number.
Arithmetic/geometric sequence, 50/50
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