Call your memoized function on values 1 .. n-1 first, before calling it on n. On Dec 12, 2015 9:45 PM, "Sunil S Nandihalli" <sunil.nandiha...@gmail.com> wrote:
> a small correction. The function computes the modulo 100000007 of the > answer and not the answer itself. I ran it in the repl. > Thanks, > Sunil. > > On Sun, Dec 13, 2015 at 11:08 AM, Sunil S Nandihalli < > sunil.nandiha...@gmail.com> wrote: > >> Hi Everybody, >> I wrote the simple function for computing the number of >> binary-search-trees that can be formed from a sequence of numbers from 1 to >> N using memoization. I get a stack-overflow for values more than N of 196. >> Can anybody help me in figuring out how to fix this? >> Thanks, >> Sunil. >> >> (defn num-trees [n] >> (let [modulo 100000007 >> trunc #(mod % modulo) >> mult-m (comp trunc *) >> add-m (comp trunc +) >> h (fn [mf l] >> (if (<= l 1) 1 >> (trunc (reduce add-m 0 >> (map #(mult-m (mf mf (- l % 1)) (mf mf %)) >> (range l)))))) >> mf (memoize h)] >> (mf mf n))) >> >> > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
