Merge remote-tracking branch 'upstream/master' into challenge113

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diff --git a/challenge-113/abigail/python/ch-1.py b/challenge-113/abigail/python/ch-1.py
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+++ b/challenge-113/abigail/python/ch-1.py
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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-1.py < input-file
+#
+
+#     
+# For a description of the algorithm, and the proof why this is correct:
+# https://abigail.github.io/HTML/Perl-Weekly-Challenge/week-113-1.html
+#  
+
+import fileinput
+
+gcds = [0, 1, 2, 1, 2, 5, 2, 1, 2, 1]
+
+for line in fileinput . input ():
+    (N, D) = line . split ();
+    N = int (N)
+    D = int (D)
+    if D == 0:
+        print (1 if N >= 100 or N % 10 == 0 else 0)
+        continue
+
+    if N >= D * 10:
+        print (1)
+        continue
+
+    done = False
+    for i in range (0, D // gcds [D]):
+        T = N - 10 * i - D
+        if T >= 0 and T % D == 0:
+            print (1)
+            done = True
+            break
+    if not done:
+        print (0)