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Task/Permutations/Ring/permutations.ring

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+list = [1, 2, 3, 4]
+for perm = 1 to 24
+    for i = 1 to len(list)
+        see list[i] + " "
+    next
+    see nl
+    nextPermutation(list)
+next
+
+func nextPermutation a
+     elementcount = len(a)
+     if elementcount < 1 then return ok
+     pos = elementcount-1
+     while a[pos] >= a[pos+1]
+           pos -= 1
+           if pos <= 0 permutationReverse(a, 1, elementcount)
+              return ok
+     end
+     last = elementcount
+     while a[last] <= a[pos]
+           last -= 1
+     end
+     temp = a[pos]
+     a[pos] = a[last]
+     a[last] = temp
+     permutationReverse(a, pos+1, elementcount)
+
+ func permutationReverse a, first, last
+      while first < last
+            temp = a[first]
+            a[first] = a[last]
+            a[last] = temp
+            first += 1
+            last -= 1
+      end