day 12 tweaks

1 files changed, 27 insertions, 0 deletions

diff --git a/aoc2023/src/utilities/array2d.gleam b/aoc2023/src/utilities/array2d.gleam
new file mode 100644
index 0000000..1ad824c
--- /dev/null
+++ b/aoc2023/src/utilities/array2d.gleam
@@ -0,0 +1,27 @@
+import gleam/list
+import gleam/dict.{type Dict}
+import gleam/string
+
+pub type Posn {
+  Posn(x: Int, y: Int)
+}
+
+pub type Array2D(a) =
+  Dict(Posn, a)
+
+pub fn to_2d_array(xss: List(List(a))) -> Array2D(a) {
+  {
+    use x, row <- list.index_map(xss)
+    use y, cell <- list.index_map(row)
+    #(Posn(x, y), cell)
+  }
+  |> list.flatten
+  |> dict.from_list
+}
+
+pub fn parse_grid(str: String) -> Array2D(String) {
+  str
+  |> string.split("\n")
+  |> list.map(string.to_graphemes)
+  |> to_2d_array
+}