Add day 2 part 2

day2/run.py

@@ -1,3 +1,4 @@
+from copy import deepcopy
 from typing import List
 
 EXAMPLE = """
@@ -29,18 +30,31 @@ class CheckLevels:
     def _part2(self) -> int:
         return len([val for val in self.get_safe(problem_damper=True) if val])
 
-    def get_differences(self) -> List[List[int]]:
-        return [
-            [val - line[i] for i, val in enumerate(line[1:])] for line in self.levels
-        ]
+    @staticmethod
+    def get_differences(line) -> List[List[int]]:
+        return [val - line[i] for i, val in enumerate(line[1:])]
 
     def get_safe(self, problem_damper: bool = False) -> List[List[bool]]:
-        outp = []
-        for line in self.get_differences():
+        def is_level_safe(line: List[int]) -> bool:
             all_same = all([val < 0 for val in line]) or all([val > 0 for val in line])
-            all_ge_1 = min([abs(val) for val in line]) >= 1
-            all_le_3 = max([abs(val) for val in line]) <= 3
-            outp.append(all_same and all_ge_1 and all_le_3)
+            all_in_range = (
+                min([abs(val) for val in line]) >= 1
+                and max([abs(val) for val in line]) <= 3
+            )
+            return all_same and all_in_range
+
+        outp = []
+        for line in self.levels:
+            safe = is_level_safe(self.get_differences(line))
+            if problem_damper and not safe:
+                for i in range(len(line)):
+                    reduced = deepcopy(line)
+                    reduced.pop(i)
+                    reduced_safe = is_level_safe(self.get_differences(reduced))
+                    if reduced_safe:
+                        safe = reduced_safe
+                        break
+            outp.append(safe)
         return outp