day3 wip

day3.exs

@@ -0,0 +1,40 @@
+defmodule Day3 do
+  def input() do
+    File.stream!("input/day3.in")
+    |> Stream.map(fn x ->
+      Regex.scan(~r/\d+/, x)
+      |> Enum.map(&String.to_integer(hd(&1)))
+    end)
+  end
+
+  def fill_grid() do
+    # create a 1000x1000 grid
+    grid =
+      []
+      |> List.duplicate(1000)
+      |> List.duplicate(1000)
+
+    input()
+    |> Enum.reduce(grid, fn [id, x, y, w, h], acc ->
+      y..h
+      |> Enum.reduce(acc, fn row, grid_row ->
+        x..w
+        |> Enum.reduce(grid_row, fn col, grid_col ->
+          grid_col
+          |> List.update_at(row, fn z ->
+            IO.puts("row: #{row}, col: #{col}")
+
+            z
+            |> List.update_at(col, &[id | &1])
+          end)
+        end)
+      end)
+    end)
+    |> Enum.reduce(0, fn x, acc ->
+      acc + Enum.count(x, &(length(&1) > 1))
+    end)
+  end
+end
+
+# Day3.get_claims()
+IO.puts(Day3.fill_grid())