1 files changed, 25 insertions, 0 deletions
diff --git a/challenge-243/steven-wilson/python/ch-1.py b/challenge-243/steven-wilson/python/ch-1.py
new file mode 100644
index 0000000000..59f53277bf
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+++ b/challenge-243/steven-wilson/python/ch-1.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+from itertools import permutations
+
+
+def reverse_pairs(*elements):
+    '''
+    return the number of reverse pairs in the given array
+    >>> reverse_pairs(1, 3, 2, 3, 1)
+    2
+    >>> reverse_pairs(2, 4, 3, 5, 1)
+    3
+    '''
+    count = 0
+    perms = permutations(range(len(elements)), r=2)
+    for i, j in perms:
+        if elements[i] > 2 * elements[j] and 0 <= i and i < j and j < len(elements):
+            count += 1
+    return count
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()