it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Convert a vector into a number
Find the biggest empty box
Remove entire row and column in the matrix containing the input values
Sort complex numbers into complex conjugate pairs
Power The Product
Is there a GPU Device?
Divide elements by sum of elements
Repeat string n times - 2
Pi Digit Probability
Van Eck's Sequence's nth member
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