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import adglent.{First, Second}
import gleam/io
import gleam/int
import gleam/string
import gleam/list
pub type Game {
Game(red: Int, blue: Int, green: Int)
}
fn parse(input: String) -> List(List(Game)) {
use line <- list.map(string.split(input, "\n"))
let assert [_, rounds] = string.split(line, on: ": ")
use match <- list.map(string.split(rounds, on: "; "))
use acc, draw <- list.fold(
over: string.split(match, on: ", "),
from: Game(0, 0, 0),
)
let assert Ok(#(n_str, color)) = string.split_once(draw, " ")
let assert Ok(n) = int.parse(n_str)
case color {
"red" -> Game(..acc, red: n)
"blue" -> Game(..acc, blue: n)
"green" -> Game(..acc, green: n)
_ -> panic as "unrecognized color"
}
}
pub fn part1(input: String) {
use acc, game, i <- list.index_fold(parse(input), 0)
case list.any(game, fn(m) { m.red > 12 || m.green > 13 || m.blue > 14 }) {
False -> acc + i + 1
True -> acc
}
}
pub fn part2(input: String) {
{
use game <- list.map(parse(input))
use acc, match <- list.fold(game, Game(0, 0, 0))
let Game(red: red, green: green, blue: blue) = match
Game(
red: int.max(red, acc.red),
blue: int.max(blue, acc.blue),
green: int.max(green, acc.green),
)
}
|> list.fold(
from: 0,
with: fn(acc, g: Game) { acc + g.red * g.blue * g.green },
)
}
pub fn main() {
let assert Ok(part) = adglent.get_part()
let assert Ok(input) = adglent.get_input("2")
case part {
First ->
part1(input)
|> adglent.inspect
|> io.println
Second ->
part2(input)
|> adglent.inspect
|> io.println
}
}
|
