gleam 2019 day 1

1 files changed, 32 insertions, 0 deletions

diff --git a/aoc2019_gleam/src/aoc_2019/day_1.gleam b/aoc2019_gleam/src/aoc_2019/day_1.gleam
new file mode 100644
index 0000000..7e23172
--- /dev/null
+++ b/aoc2019_gleam/src/aoc_2019/day_1.gleam
@@ -0,0 +1,32 @@
+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+pub fn parse(input: String) -> List(Int) {
+  input
+  |> string.split("\n")
+  |> list.map(int.parse)
+  |> result.values()
+}
+
+pub fn pt_1(input: List(Int)) {
+  input
+  |> list.fold(0, fn(total, next) { total + naive_fuel(next) })
+}
+
+pub fn pt_2(input: List(Int)) {
+  input
+  |> list.fold(0, fn(total, next) { total + recursive_fuel(next) })
+}
+
+fn naive_fuel(weight: Int) -> Int {
+  { weight / 3 } - 2
+}
+
+fn recursive_fuel(weight: Int) -> Int {
+  case { weight / 3 } - 2 {
+    n if n <= 0 -> 0
+    n -> n + recursive_fuel(n)
+  }
+}