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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()
}
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