Hong Yang <hyang...@gmail.com> wrote in article 
<f31db34d0911110452x7786572ay4482dffc4824a...@mail.gmail.com> in 
gmane.comp.lang.haskell.cafe:
> I want to shuffle the rows to maximize the number of columns whose first 100
> rows have at least one number

Sounds like the maximum coverage problem, which is said to be
NP-hard. [citation needed]
http://en.wikipedia.org/wiki/Maximum_coverage_problem

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The answer to the ultimate question of life the universe and everything = 42
but usually it's not.

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