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)
Make the vector [1 2 3 4 5 6 7 8 9 10]
vectorization in N
Find the sum of the elements in the "second" diagonal
"Low : High - Low : High - Turn around " -- Create a subindices vector
Derivative of polynomial
Hexagonal numbers on a spiral matrix
Grouped Frequency Distributions
Recaman Sequence - II
Duration of a trip in minutes
Delete the rows in the middle
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