In the explanations, links are to problems, but in the solve page, links are to solutions.
Newer checked that. Thanks for pointing that out.
Should be ok now. Using seems to be not a good idea here. I have to check other problems I've submitted :-)
problem statement is a little vague
First non-zero element in each column
Back to basics 15 - classes
kmph to mps
Find last zero for each column
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