X-Git-Url: https://git.rkrishnan.org/?p=sicp.git;a=blobdiff_plain;f=src%2Fsicp%2Fex4_38.rkt;fp=src%2Fsicp%2Fex4_38.rkt;h=e705ef0c02d843924012f5e40fd9856b69727a95;hp=0000000000000000000000000000000000000000;hb=50cef372de91c41185de4fac8a1fc456c978b28a;hpb=07f6c2a14b01e1a1f9c585c8a53086fbb819f8f8

diff --git a/src/sicp/ex4_38.rkt b/src/sicp/ex4_38.rkt
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--- /dev/null
+++ b/src/sicp/ex4_38.rkt
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+#lang racket
+
+(require "amb-eli.rkt")
+(require "distinct.rkt")
+
+(define (multiple-dwelling)
+  (let ([baker (amb 1 2 3 4 5)]
+        [cooper (amb 1 2 3 4 5)]
+        [fletcher (amb 1 2 3 4 5)]
+        [miller (amb 1 2 3 4 5)]
+        [smith (amb 1 2 3 4 5)])
+    (assert (distinct? (list baker cooper fletcher miller smith)))
+    (assert (not (= baker 5)))
+    (assert (not (= cooper 1)))
+    (assert (not (= fletcher 5)))
+    (assert (not (= fletcher 1)))
+    (assert (> miller cooper))
+    ;; (assert (not (= (abs (- smith fletcher)) 1)))
+    (assert (not (= (abs (- fletcher cooper)) 1)))
+    (list (list 'baker baker)
+          (list 'cooper cooper)
+          (list 'fletcher fletcher)
+          (list 'miller miller)
+          (list 'smith smith))))
+
+(collect (multiple-dwelling))
+
+#|
+'(((baker 1) (cooper 2) (fletcher 4) (miller 3) (smith 5))
+  ((baker 1) (cooper 2) (fletcher 4) (miller 5) (smith 3))
+  ((baker 1) (cooper 4) (fletcher 2) (miller 5) (smith 3))
+  ((baker 3) (cooper 2) (fletcher 4) (miller 5) (smith 1))
+  ((baker 3) (cooper 4) (fletcher 2) (miller 5) (smith 1)))
+|#
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