day9 - foreign input; reworked p1 to work with both inputs

day09.py

@@ -36,10 +36,12 @@ class Day(AOCDay):
     inputs = [
         [
             (1928, "input9_test"),
+            (6154342787400, "input9_dennis"),
             (6346871685398, "input9"),
         ],
         [
             (2858, "input9_test"),
+            (6183632723350, "input9_dennis"),
             (6373055193464, "input9"),
         ],
     ]
@@ -62,38 +64,18 @@ class Day(AOCDay):
         return head, tail
 
     def part1(self) -> Any:
-        head, tail = self.parse_input()
-
-        index = head
-        while index is not None:
-            if index.file_id != -1:
-                index = index.right
+        filesystem = [i // 2 if i % 2 == 0 else -1 for i, c in enumerate(map(int, self.getInput())) for _ in range(c)]
+        index = 0
+        while index < len(filesystem):
+            if filesystem[index] != -1:
+                index += 1
                 continue
 
-            if tail.file_id == -1:
-                tail = tail.left
-                tail.right = None
+            filesystem[index] = filesystem.pop()
+            while filesystem[-1] == -1:
+                filesystem.pop()
 
-            if tail.file_length > index.file_length:
-                index.file_id = tail.file_id
-                tail.file_length -= index.file_length
-            elif tail.file_length < index.file_length:
-                space_left = index.file_length - tail.file_length
-                index.file_id = tail.file_id
-                index.file_length = tail.file_length
-                tail = tail.left
-                tail.right = None
-                new_space = Block(-1, space_left, index)
-                new_space.right = index.right
-                index.right = new_space
-            else:
-                index.file_id = tail.file_id
-                tail = tail.left
-                tail.right = None
-
-            index = index.right
-
-        return get_checksum(head)
+        return sum(i * c for i, c in enumerate(filesystem))
 
     def part2(self) -> Any:
         head, tail = self.parse_input()