WIP

[sicp.git] / src / sicp / logic-puzzles.rkt

diff --git a/src/sicp/logic-puzzles.rkt b/src/sicp/logic-puzzles.rkt
new file mode 100644 (file)
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+++ b/src/sicp/logic-puzzles.rkt
@@ -0,0 +1,26 @@
+#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))))
+
+(multiple-dwelling)
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