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... :)
Remove NaN ?
Number of Circles in a Number
06 - Matrix Equations 2
Area of an equilateral triangle
Calculate the Damerau-Levenshtein distance between two strings.
Polite numbers. N-th polite number.
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