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Import some exercises and solutions
author Louis Opter <kalessin@kalessin.fr>
date Sat, 29 Jun 2013 19:30:31 -0700
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“Draw” Crosses in a Matrix
==========================

Write an algorithm such that if an element in an MxN matrix is 0 is entire row
and column is set to 0.

.. note::

   I actually didn't get this during an interview but it seems to be a classic.