1 files changed, 28 insertions, 0 deletions
diff --git a/day-05/sol.exs b/day-05/sol.exs
new file mode 100644
index 0000000..e1dab2b
--- /dev/null
+++ b/day-05/sol.exs
@@ -0,0 +1,28 @@
+defmodule Solution do
+  def solve(input, chunk) do
+    (String.split(input, "", trim: true)
+     |> Enum.chunk_every(chunk, 1, :discard)
+     |> Enum.map(fn window ->
+       Enum.reduce(window, %{}, fn char, acc ->
+         Map.put(acc, char, Map.get(acc, char, 0) + 1)
+       end)
+     end)
+     |> Enum.find_index(fn letter_counts ->
+       Enum.all?(letter_counts, fn {_key, value} ->
+         value == 1
+       end)
+     end)) + chunk
+  end
+
+  def main do
+    input = File.read!("input")
+
+    solve(input, 4)
+    |> IO.inspect()
+
+    solve(input, 14)
+    |> IO.inspect()
+  end
+end
+
+Solution.main()