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)
I agree with Alfonso.
@Mehmet can you explain why?
Check to see if a Sudoku Puzzle is Solved
Replace Vector Elements
Symmetry of vector
Write c^3 as sum of two squares a^2+b^2
Get Next Combination
'5*3' copy character 3 - five times
Check if the input is an interprime
Longest Sequence of NaNs
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