day 2 part 1

src/bin/day2.rs

@@ -0,0 +1,91 @@
+#![forbid(elided_lifetimes_in_paths, unsafe_code)]
+
+use aoc23::read;
+use chumsky::prelude::*;
+use chumsky::text::int;
+
+enum Color {
+	Red,
+	Green,
+	Blue
+}
+
+impl Color {
+	fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
+		choice((
+			just("red").map(|_| Self::Red),
+			just("green").map(|_| Self::Green),
+			just("blue").map(|_| Self::Blue)
+		))
+	}
+}
+
+struct Hand {
+	red: u32,
+	green: u32,
+	blue: u32
+}
+
+impl Hand {
+	fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
+		int(10).then_ignore(just(" ")).then(Color::parser()).separated_by(just(", ")).map(|colors: Vec<(String, Color)>| {
+			let mut red = None;
+			let mut green = None;
+			let mut blue = None;
+			for (amount, color) in colors {
+				let amount: u32 = amount.parse().unwrap();
+				match color {
+					Color::Red => red = Some(amount),
+					Color::Green => green = Some(amount),
+					Color::Blue => blue = Some(amount)
+				}
+			}
+			Self {
+				red: red.unwrap_or_default(),
+				green: green.unwrap_or_default(),
+				blue: blue.unwrap_or_default()
+			}
+		})
+	}
+}
+
+struct Game {
+	id: u32,
+	hands: Vec<Hand>
+}
+
+impl Game {
+	fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
+		just("Game ").ignore_then(int(10)).then_ignore(just(": ")).then(Hand::parser().separated_by(just("; ")))
+			.map(|(game_id, hands)| {
+				Game {
+					id: game_id.parse().unwrap(),
+					hands
+				}
+			})
+	}
+}
+
+fn parser() -> impl Parser<char, Vec<Game>, Error = Simple<char>> {
+	Game::parser().then_ignore(just("\n")).repeated().then_ignore(end())
+}
+
+fn main() -> anyhow::Result<()> {
+	let games = read("inputs/day2.txt", parser())?;
+
+	let max_red = 12;
+	let max_green = 13;
+	let max_blue = 14;
+	let mut id_sum = 0;
+	'game: for game in games {
+		for hand in game.hands {
+			if hand.red > max_red || hand.green > max_green || hand.blue > max_blue {
+				continue 'game;
+			}
+		}
+		id_sum += game.id;
+	}
+	println!("{id_sum}");
+
+	Ok(())
+}