@saljam_ you also want to be able to get elements to left and right, and above/below as well, right?
@saljam_ the more i think of it, the less I'm sure of priority queues. But it's as good as anything else...
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@saljam_ clearly what you want is an ordered list which is ordered on elements of a doubly linked list :P
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@saljam_ there's room in the conceptual world for a two-tier data structure called an espalier http://2.bp.blogspot.com/-wICTVaXmPeE/U1ukDd8KmVI/AAAAAAABrs4/hkuTPLPXxRY/s1600/2.jpg …
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