Day 02b

day02/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 aoc = { path = "../aoc" }
 color-eyre = "0.6.2"
 nom = "7.1.3"
+rayon = "1.8.0"

day02/src/bin/day02b.rs

@@ -0,0 +1,39 @@
+// Copyright (C) 2023 Leandro Lisboa Penz <lpenz@lpenz.org>
+// This file is subject to the terms and conditions defined in
+// file 'LICENSE', which is part of this source code package.
+
+use rayon::prelude::*;
+use std::io::{stdin, BufRead};
+
+use day02::*;
+
+fn process(bufin: impl BufRead) -> Result<u32> {
+    let input = parser::parse(bufin)?;
+    Ok(input
+        .into_par_iter()
+        .map(|game| {
+            game.into_iter()
+                .fold(Set::new(), |maxset, sets| {
+                    sets.into_iter().fold(maxset, |mut maxset, (color, num)| {
+                        let e = maxset.entry(color).or_default();
+                        *e = std::cmp::max(*e, num);
+                        maxset
+                    })
+                })
+                .into_values()
+                .product::<u32>()
+        })
+        .sum())
+}
+
+#[test]
+fn test() -> Result<()> {
+    assert_eq!(process(EXAMPLE.as_bytes())?, 2286);
+    Ok(())
+}
+
+fn main() -> Result<()> {
+    color_eyre::install()?;
+    println!("{}", process(stdin().lock())?);
+    Ok(())
+}

day02/src/lib.rs

@@ -12,7 +12,7 @@ Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
 Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
 ";
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
 pub enum Color {
     Red,
     Green,