Bringing some days up to speed after a short break

1/2.py

@@ -18,7 +18,7 @@ if __name__ == '__main__':
             right.append(r)
     # how many times does each number apear in each list
     right = counts(right)
-    score = 0
+    score = sum([0 if n in right else n * right[n]  for n in left])
     for n in left:
         if n not in right: continue
         score += n * right[n]