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... :)
The Goldbach Conjecture
Find common elements in matrix rows
Side of a rhombus
Sum of odd numbers in a matrix
Calculate the Damerau-Levenshtein distance between two strings.
Pancakes for everyone!
Best Problem Elections
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