Given a distribution of packages on media and a list of dependences
between packages, you have to calculate the minimal number of media
changes required to install all packages. For your convenience, you
may assume that the operating system comes on exactly 2 DVDs.

http://www.spoj.pl/problems/ALL/

I think with

Topological-sort  + DP for find the maximun number of changes in each
node for each DVD?

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