Permutations by swapping: Difference between revisions

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@@ Line 747: / Line 747: @@
 =={{header|Nimrod}}==
 <lang nimrod># iterative Boothroyd method
-iterator permutations[T](ys: openarray[T]): tuple[perm: seq[T], sign: int] =
+iterator permutations*[T](ys: openarray[T]): tuple[perm: seq[T], sign: int] =
   var
     d = 1
@@ Line 772: / Line 772: @@
       inc c[d]
+if isMainModule:
-for i in permutations([0,1,2]):
+  for i in permutations([0,1,2]):
-  echo i
+    echo i
-echo ""
+  echo ""
-for i in permutations([0,1,2,3]):
+  for i in permutations([0,1,2,3]):
-  echo i</lang>
+    echo i</lang>
 Output:
 <pre>(perm: @[0, 1, 2], sign: 1)