1 files changed, 12 insertions, 8 deletions
diff --git a/20/py/d09.py b/20/py/d09.py
index 4379039..9950f16 100644
--- a/20/py/d09.py
+++ b/20/py/d09.py
@@ -7,23 +7,28 @@ def intify(_in):
     return list(int(n.strip()) for n in _in)
 
 
-def pt1(_in):
+def first_invalid(nums):
     valid = []
     for i in range(25):
         for j in range(i+1, 25):
-            valid.append(_in[i] + _in[j])
-    for i in range(25, len(_in)):
-        if _in[i] not in valid:
-            return _in[i]
+            valid.append(nums[i] + nums[j])
+    for i in range(25, len(nums)):
+        if nums[i] not in valid:
+            return nums[i]
         valid = valid[24:]
         offset = 0
         for j in range(1, 25)[::-1]:
-            valid.insert(offset, _in[i - j] + _in[i])
+            valid.insert(offset, nums[i - j] + nums[i])
             offset += j
 
 
+def pt1(_in):
+    return first_invalid(intify(_in))
+
+
 def pt2(_in):
-    invalid = pt1(_in)
+    _in = intify(_in)
+    invalid = first_invalid(_in)
 
     i, s, nums = 0, 0, deque()
     while s != invalid:
@@ -44,6 +49,5 @@ if __name__ == "__main__":
         input = open(sys.argv[1], "r").readlines()
     else:
         input = open("../input/09", "r").readlines()
-    input = intify(input)
     print(pt1(input))
     print(pt2(input))