1 files changed, 35 insertions, 0 deletions
diff --git a/challenge-208/roger-bell-west/python/ch-2.py b/challenge-208/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..f492b4c6ab
--- /dev/null
+++ b/challenge-208/roger-bell-west/python/ch-2.py
@@ -0,0 +1,35 @@
+#! /usr/bin/python3
+
+import unittest
+
+def duplicateandmissing(a):
+  flags = 0
+  dup = 0
+  mis = 0
+  exp = a[0]
+  for n in a:
+    if n < exp:
+      dup = n
+      flags |= 1
+    elif n > exp:
+      mis = exp
+      flags |= 2
+    if flags == 3:
+      return [dup, mis]
+    exp = n + 1
+  if flags == 1:
+    return [dup, exp]
+  return [-1]
+
+class TestDuplicateandmissing(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(duplicateandmissing([1, 2, 2, 4]), [2, 3], 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(duplicateandmissing([1, 2, 3, 4]), [-1], 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(duplicateandmissing([1, 2, 3, 3]), [3, 4], 'example 3')
+
+unittest.main()