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diff --git a/aoc2017-gleam/src/aoc_2017/day_1.gleam b/aoc2017-gleam/src/aoc_2017/day_1.gleam
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+++ b/aoc2017-gleam/src/aoc_2017/day_1.gleam
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+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+pub fn parse(input: String) {
+ input
+ |> string.to_graphemes()
+ |> list.map(int.parse)
+ |> result.values()
+}
+
+pub fn pt_1(input: List(Int)) {
+ pair_by(numbers: input, considering: 1)
+}
+
+pub fn pt_2(input: List(Int)) {
+ pair_by(numbers: input, considering: list.length(input) / 2)
+}
+
+fn find_neighbor_matches(number_pairs: List(#(Int, Int))) {
+ case number_pairs {
+ [] -> 0
+ [#(a, b), ..rest] if a == b -> a + find_neighbor_matches(rest)
+ [_, ..rest] -> find_neighbor_matches(rest)
+ }
+}
+
+fn pair_by(numbers xs: List(Int), considering by: Int) {
+ list.zip(xs, list.append(list.drop(xs, by), list.take(xs, by)))
+ |> find_neighbor_matches()
+}