day 5 part 1

README.md

···
 | 02  |   ⭐   |   ⭐   | 
 | 03  |   ⭐   |   ⭐   | 
 | 04  |   ⭐   |   ⭐   | 
-| 05  |        |        |
+| 05  |   ⭐   |        | 
 | 06  |        |        |
 | 07  |        |        |
 | 08  |        |        |

src/aoc_2025/day_5.gleam

···
+import aoc_2025/util
+import gleam/list
+import gleam/string
+
+pub type Input {
+  Input(ranges: List(#(Int, Int)), ids: List(Int))
+}
+
+pub fn parse(input: String) -> Input {
+  let lines = string.split(input, "\n")
+
+  let #(ranges, ids) = {
+    let #(ranges, ids) = lines |> list.split_while(fn(line) { line != "" })
+
+    #(ranges, list.drop(ids, 1))
+  }
+
+  let ranges =
+    list.map(ranges, fn(range_str) {
+      let assert [start, end] = string.split(range_str, "-")
+
+      #(util.int_from_string(start), util.int_from_string(end))
+    })
+
+  let ids = list.map(ids, util.int_from_string)
+
+  Input(ranges, ids)
+}
+
+pub fn pt_1(input: Input) -> Int {
+  let Input(ranges:, ids:) = input
+
+  ids
+  |> list.count(fn(id) {
+    list.any(ranges, fn(range) { id >= range.0 && id <= range.1 })
+  })
+}
+
+pub fn pt_2(input: Input) {
+  todo as "part 2 not implemented"
+}

src/aoc_2025/util.gleam

···
+import gleam/int
+
+pub fn int_from_string(num: String) -> Int {
+  let assert Ok(num) = int.parse(num)
+  num
+}