all tasks

Task/Sorting-algorithms-Permutation-sort/Icon/sorting-algorithms-permutation-sort.icon

@@ -0,0 +1,21 @@
+procedure do_permute(l, i, n)
+    if i >= n then
+        return l
+    else
+        suspend l[i to n] <-> l[i] & do_permute(l, i+1, n)
+ end
+
+ procedure permute(l)
+    suspend do_permute(l, 1, *l)
+ end
+
+ procedure sorted(l)
+    local i
+    if (i := 2 to *l & l[i] >= l[i-1]) then return &fail else return 1
+ end
+
+ procedure main()
+    local l
+    l := [6,3,4,5,1]
+    |( l := permute(l) & sorted(l)) \1 & every writes(" ",!l)
+ end