gleam 2017 day 2 and 3

1 files changed, 47 insertions, 0 deletions

diff --git a/aoc2017-gleam/src/aoc_2017/day_2.gleam b/aoc2017-gleam/src/aoc_2017/day_2.gleam
new file mode 100644
index 0000000..6a5e85d
--- /dev/null
+++ b/aoc2017-gleam/src/aoc_2017/day_2.gleam
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+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+pub fn parse(input: String) {
+  use row <- list.map(string.split(input, "\n"))
+  use val <- list.map(string.split(row, "\t"))
+  let assert Ok(n) = int.parse(val)
+  n
+}
+
+pub fn pt_1(input: List(List(Int))) {
+  use acc, row <- list.fold(input, 0)
+  acc + max(row) - min(row)
+}
+
+pub fn pt_2(input: List(List(Int))) {
+  use acc, row <- list.fold(input, 0)
+  let assert [val] =
+    row |> list.combination_pairs() |> list.map(test_pair) |> result.values()
+  acc + val
+}
+
+fn max(xs) {
+  let assert Ok(result) = list.reduce(xs, int.max)
+  result
+}
+
+fn min(xs) {
+  let assert Ok(result) = list.reduce(xs, int.min)
+  result
+}
+
+fn test_pair(tup) {
+  case tup {
+    #(a, b) if a > b -> check_divisibility(a, b)
+    #(b, a) -> check_divisibility(a, b)
+  }
+}
+
+fn check_divisibility(a, b) {
+  case a % b {
+    0 -> Ok(a / b)
+    _ -> Error(Nil)
+  }
+}