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)
Most nonzero elements in row
Tic Tac Toe FTW
Project Euler: Problem 2, Sum of even Fibonacci
Construct a string from letters and counts
Triangle Numbers Below N
Find a real root of a quintic function
Net Present Value of a Stream of Cash Flows
Calculate trends in time series
Divide elements by sum of elements
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