From 84a9387597aac93c06f02990b8a68d5e93ae75c9 Mon Sep 17 00:00:00 2001 From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com> Date: Wed, 11 Aug 2010 20:27:43 +0530 Subject: [PATCH] solution to 2.41 --- src/sicp/ex2_41.clj | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 src/sicp/ex2_41.clj diff --git a/src/sicp/ex2_41.clj b/src/sicp/ex2_41.clj new file mode 100644 index 0000000..e43773a --- /dev/null +++ b/src/sicp/ex2_41.clj @@ -0,0 +1,21 @@ +(ns sicp.ex2_41 + (:use [sicp.ch2-2 :only (enumerate-interval accumulate append)])) + +(defn triplets [n] + (accumulate append + nil + (accumulate append + nil + (map (fn [i] + (map (fn [j] + (map (fn [k] (list i j k)) + (enumerate-interval 1 (- j 1)))) + (enumerate-interval 1 (- i 1)))) + (enumerate-interval 1 n))))) + +(defn sum-triplets [triplet] + (accumulate + 0 triplet)) + +(defn ordered-triplets [n sum] + (filter #(= (sum-triplets %) sum) + (triplets n))) \ No newline at end of file -- 2.45.2