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Task/Sorting-algorithms-Permutation-sort/EchoLisp/sorting-algorithms-permutation-sort.echolisp

@@ -0,0 +1,17 @@
+;; This efficient sort method uses the list library for permutations
+
+(lib 'list)
+(define (in-order L)
+(cond
+    ((empty? L) #t)
+    ((empty? (rest L)) #t)
+    (else (and ( < (first L) (second  L)) (in-order (rest L))))))
+
+(define L (shuffle (iota 6)))
+    → (1 5 4 2 0 3)
+
+(for ((p (in-permutations (length L ))))
+    #:when (in-order (list-permute L p))
+       (writeln (list-permute L p)) #:break #t)
+
+    → (0 1 2 3 4 5)