I need help about algorithmics and java.

I want to resolve the next problem:
A technologic factory with M workers has sended N products to a conference about them.The "n" product have a list of workers which have worked in his developement and can make the presentation. Each worker have a number between 1 and N, every presentations are a in a diferent hour.The factory want than all products have presented but with the minimum number of workers.
Implment an algorithm based of in branching to make this rule.
THAN YOU; I NEED YOUR HELP.
If you want to see the problem in Spanish go to:
http://www.dlsi.ua.es/asignaturas/ea/ea.html

You have a simple algebra problem. Break down your problem in mathematical term. Isolate each step of your problem. Solve each step in Java and you will have your algorithm.

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