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For question borderline with, or having application to, computer science. Consider also posting http://cs.stackexchange.com/ or http://cstheory.stackexchange.com/ instead of here, if appropriate.

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Pancake sorting problem – Is computing f(n) NP-hard?

The so-called Pancake flipping problem first discussed by Jacob E. Goodman here yields two entangled problems: MIN-SBPR (Sorting By Prefix Reversals) - Given a permutation, find the smallest sequence …
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