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Task/Sorting-algorithms-Permutation-sort/Nim/sorting-algorithms-permutation-sort.nim

@@ -0,0 +1,38 @@
+iterator permutations[T](ys: openarray[T]): seq[T] =
+  var
+    d = 1
+    c = newSeq[int](ys.len)
+    xs = newSeq[T](ys.len)
+
+  for i, y in ys: xs[i] = y
+  yield xs
+
+  block outter:
+    while true:
+      while d > 1:
+        dec d
+        c[d] = 0
+      while c[d] >= d:
+        inc d
+        if d >= ys.len: break outter
+
+      let i = if (d and 1) == 1: c[d] else: 0
+      swap xs[i], xs[d]
+      yield xs
+      inc c[d]
+
+proc isSorted[T](s: openarray[T]): bool =
+  var last = low(T)
+  for c in s:
+    if c < last:
+      return false
+    last = c
+  return true
+
+proc permSort[T](a: openarray[T]): seq[T] =
+  for p in a.permutations:
+    if p.isSorted:
+      return p
+
+var a = @[4, 65, 2, -31, 0, 99, 2, 83, 782]
+echo a.permSort