Solve day 2

lib/aoc2024/day_02.ex

@@ -1,13 +1,32 @@
 defmodule Aoc2024.Day02 do
   def parse(input) do
-    input |> String.split("\n", trim: true)
+    Aoc2024.Utils.parse_rows_of_integers(input)
   end
 
-  def part1(_lines) do
+  def part1(reports) do
-    :todo1
+    reports |> Enum.count(&isValid/1)
   end
 
-  def part2(_lines) do
+  defp isValid(report) do
-    :todo2
+    diffs =
+      report
+      |> Enum.zip(tl(report))
+      |> Enum.map(fn {a, b} -> b - a end)
+
+    diffs |> Enum.all?(fn diff -> diff in [1, 2, 3] end) ||
+      diffs |> Enum.all?(fn diff -> diff in [-1, -2, -3] end)
+  end
+
+  def part2(reports) do
+    reports |> Enum.count(&isValidWithProblemDampener/1)
+  end
+
+  defp isValidWithProblemDampener(report) do
+    isValid(report) ||
+      report
+      |> Enum.with_index()
+      |> Enum.any?(fn {_elem, index} ->
+        isValid(report |> List.delete_at(index))
+      end)
   end
 end