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.
random picture with random colours
Make a run-length companion vector
intersection of matrices
Find out missing number from a vector of 9 elements
Count from 0 to N^M in base N.
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