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    Optimizations like the kind you described are almost always going to make the code a bit less elegant. Commented Oct 6, 2012 at 16:25
  • @Robert Harvey: Are there any alternative techniques to keep stack usage low? I mean I imagine I have to rewrite my functions differently but I have no clue whether there are well-established techniques. My first attempt was to use tail-recursive functions, which helped but did not allow me to solve my problem completely. Commented Oct 6, 2012 at 19:17