1 files changed, 43 insertions, 0 deletions
diff --git a/challenge-191/roger-bell-west/python/ch-2.py b/challenge-191/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..a06335557f
--- /dev/null
+++ b/challenge-191/roger-bell-west/python/ch-2.py
@@ -0,0 +1,43 @@
+#! /usr/bin/python3
+
+import unittest
+
+def cutelist(n):
+  tab = [[False]]
+  for x in range(1, n+1):
+    tab.append([False] * (n+1))
+  for x in range(1, n+1):
+    for y in range(1, x+1):
+      if x % y != 0 and y % x != 0:
+        tab[x][y] = True
+        tab[y][x] = True
+  count = 0
+  stackl = [[]]
+  stackc = [[x for x in range(1,n+1)]]
+  while len(stackl) > 0:
+    l = stackl.pop()
+    c = stackc.pop()
+    if len(c) == 0 and len(l) == n:
+      count += 1
+    else:
+      place = len(l) + 1
+      for candidate in c:
+        if not tab[place][candidate]:
+          q = l.copy()
+          q.append(candidate)
+          stackl.append(q)
+          stackc.append([i for i in c if i != candidate])
+  return count
+
+class TestCutelist(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(cutelist(2), 2, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(cutelist(10), 700, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(cutelist(15), 24679, 'example 3')
+
+unittest.main()