the text does not specify the expected order of the rows
It would be helpful if the text gave an example. Also, the test suite should be much richer - only two special cases does not really encourage people to write general solutions.
Based on Paul Berglund's solution (Solution 321219).
Not a great solution, but the test suite needs to be improved.
Summing Digits within Text
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 4 - Search Path
Reindex a vector
Find the nearest integer
Count from 0 to N^M in base N.
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