2 files changed, 78 insertions, 0 deletions
diff --git a/challenge-270/roger-bell-west/python/ch-1.py b/challenge-270/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..56c82863e0
--- /dev/null
+++ b/challenge-270/roger-bell-west/python/ch-1.py
@@ -0,0 +1,37 @@
+#! /usr/bin/python3
+
+def validator(a0):
+  a = a0.copy()
+  a.sort()
+  l = len(a)
+  if a[0] == 0 and a[l - 2] == 0 and a[l - 1] == 1:
+    return a0.index(1)
+  return -1
+
+def specialpositions(a):
+  vr = set()
+  xs = set()
+  for y, row in enumerate(a):
+    x = validator(row)
+    if (x > -1):
+      vr.add((y, x))
+      xs.add(x)
+  xd = set()
+  for x in xs:
+    c = [r[x] for r in a]
+    if validator(c) == -1:
+      xd.add(x)
+  xs -= xd
+  return len([x for (y, x) in vr if x in xs])
+
+import unittest
+
+class TestSpecialpositions(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(specialpositions([[1, 0, 0], [0, 0, 1], [1, 0, 0]]), 1, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(specialpositions([[1, 0, 0], [0, 1, 0], [0, 0, 1]]), 3, 'example 2')
+
+unittest.main()
diff --git a/challenge-270/roger-bell-west/python/ch-2.py b/challenge-270/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..daeb95ee64
--- /dev/null
+++ b/challenge-270/roger-bell-west/python/ch-2.py
@@ -0,0 +1,41 @@
+#! /usr/bin/python3
+
+from collections import deque
+
+def equalizearray(a0, x, y):
+  a = a0.copy()
+  a.sort()
+  limit = a[-1]
+  queue = deque()
+  queue.append((a, 0))
+  mc = -1
+  while len(queue) > 0:
+    op = queue.popleft()
+    if mc == -1 or mc > op[1]:
+      if op[0][0] == op[0][-1]:
+        mc = op[1]
+      else:
+        p = op[0].copy()
+        p[0] += 1
+        if p[0] <= limit:
+          p.sort()
+          queue.append((p, op[1] + x))
+          q = op[0].copy()
+          q[0] += 1;
+          q[1] += 1;
+          if q[1] <= limit:
+            q.sort()
+            queue.append((q, op[1] + y))
+  return mc
+
+import unittest
+
+class TestEqualizearray(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(equalizearray([4, 1], 3, 2), 9, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(equalizearray([2, 3, 3, 3, 5], 2, 1), 6, 'example 2')
+
+unittest.main()