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.
Sum of diagonal of a square matrix
Back to basics 26 - Keywords
Spot the outlier
Set some matrix elements to zero
Who has power to do everything in this world?
Count from 0 to N^M in base N.
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