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Mathematica

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  • $\begingroup$ Can the starting list always be assumed to be "properly ordered"? $\endgroup$ Commented Sep 19, 2012 at 23:23
  • 1
    $\begingroup$ Yes. The elements in the input list are always in order, and at least they could always be sorted by their first element. $\endgroup$ Commented Sep 19, 2012 at 23:28
  • $\begingroup$ Are your lists always 3 levels deep or do you have arbitrarily deep lists? $\endgroup$ Commented Sep 19, 2012 at 23:35
  • $\begingroup$ Arbitrarily deep, that's where the trickiness of the problem lies. $\endgroup$ Commented Sep 19, 2012 at 23:37