DOI: 10.47749/t/unicamp.2016.979636
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The problem of sorting permutations by prefix and suffix rearrangements

Abstract: Order from disorder. The pancake stack's in disarray. How many flips to arrange the stack back to an ordered way? Jacob Goodman (aka Harry Dweighter) proposed the problem, (so easy to state), back in nineteen seventy-five. But forty years later it's still very much alive and kicking, it hasn't been solved, it needs some licking.Bill Gates resolved to have a go and showed with absolute certainty an upper limit of '5n plus 5, all over three'. But the problem persists, no formula exists, it resists the best minds… Show more

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