1 files changed, 43 insertions, 0 deletions
diff --git a/challenge-245/steven-wilson/python/ch-2.py b/challenge-245/steven-wilson/python/ch-2.py
new file mode 100644
index 0000000000..74f2ade0e3
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+++ b/challenge-245/steven-wilson/python/ch-2.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+
+from itertools import permutations
+
+
+def concate_to_number(elements):
+    '''Concatinate a list of integers to an integer
+    >>> concate_to_number([9, 8, 1])
+    981
+    >>> concate_to_number([0, 1, 2])
+    12
+    '''
+    return int("".join(map(str, elements)))
+
+
+def largest_of_three(*elements):
+    '''Return the largest number formed by concatenating some of the
+    given integers in any order which is also multiple of 3. Return -1
+    if none found.
+    >>> largest_of_three(8, 1, 9)
+    981
+    >>> largest_of_three(8, 6, 7, 1, 0)
+    8760
+    >>> largest_of_three(1)
+    -1
+    '''
+    ints = []
+    for i, elem in enumerate(elements, 1):
+        for perm in permutations(elements, i):
+            concate_number = concate_to_number(perm)
+            if concate_number % 3 == 0:
+                ints.append(concate_number)
+    if len(ints) > 0:
+        return max(ints)
+    else:
+        return -1
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()