1 files changed, 37 insertions, 0 deletions
diff --git a/challenge-082/roger-bell-west/python/ch-2.py b/challenge-082/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..4b88c1acf0
--- /dev/null
+++ b/challenge-082/roger-bell-west/python/ch-2.py
@@ -0,0 +1,37 @@
+#! /usr/bin/python3
+
+import unittest
+from collections import deque
+
+def isinterleave(a,b,c):
+    l=list(map(len,(a,b,c)))
+    buf=deque()
+    buf.append([0,0,0])
+    while (buf):
+        n=buf.popleft()
+        if (n[2] >= l[2]):
+            return 1
+        if ((n[0] < l[0]) and (a[n[0]] == c[n[2]])):
+            buf.append([n[0]+1,n[1],n[2]+1])
+        if ((n[1] < l[1]) and (b[n[1]] == c[n[2]])):
+            buf.append([n[0],n[1]+1,n[2]+1])
+    return 0
+
+class TestInterleave(unittest.TestCase):
+
+    def test_ex1(self):
+        self.assertEqual(isinterleave('XY','X','XXY'),1,'example 1')
+
+    def test_ex2(self):
+        self.assertEqual(isinterleave('XXY','XXZ','XXXXZY'),1,'example 2')
+
+    def test_ex3(self):
+        self.assertEqual(isinterleave('YX','X','XXY'),0,'example 3')
+
+    def test_ex4(self):
+        self.assertEqual(isinterleave('ACF','BDEG','ABCDEFG'),1,'example 4')
+
+    def test_ex5(self):
+        self.assertEqual(isinterleave('ACF','BDGE','ABCDEFG'),0,'example 5')
+
+unittest.main()