> On 10 mrt. 2014, at 23:15, Dima Pasechnik <[email protected]> wrote:
> 
> well, it's a theory question. We have a matrix in some basis, not 
> necessarily sparse.

In that case, you're done in linear time (that is O(nm)) doing as Stefan 
suggested. You can't beat reading the input, so that is optimal.
--Rudi

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