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day02.rs
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day02.rs
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use aoc_runner_derive::{aoc, aoc_generator};
use nom::{
branch::alt,
bytes::complete::tag,
combinator::value,
sequence::{pair, preceded, tuple},
IResult,
};
use crate::common::nom::{fold_separated_list0, nom_lines, nom_usize, process_input};
#[derive(Debug, PartialEq, Eq, Default)]
pub struct CubeSet {
red: usize,
green: usize,
blue: usize,
}
impl CubeSet {
fn is_valid(&self) -> bool {
self.red <= 12 && self.green <= 13 && self.blue <= 14
}
fn product(&self) -> usize {
self.red * self.green * self.blue
}
}
#[derive(Clone)]
enum Color {
Red,
Green,
Blue,
}
fn parse_color(s: &str) -> IResult<&str, (usize, Color)> {
pair(
nom_usize,
alt((
value(Color::Red, tag(" red")),
value(Color::Green, tag(" green")),
value(Color::Blue, tag(" blue")),
)),
)(s)
}
fn parse_cube_set(s: &str) -> IResult<&str, CubeSet> {
fold_separated_list0(
tag(", "),
parse_color,
CubeSet::default,
|mut acc, (count, color)| {
match color {
Color::Red => acc.red += count,
Color::Green => acc.green += count,
Color::Blue => acc.blue += count,
};
acc
},
)(s)
}
fn parse_merged_cube_set(s: &str) -> IResult<&str, CubeSet> {
// separated_list1(tag("; "), parse_cube_set)
fold_separated_list0(tag("; "), parse_cube_set, CubeSet::default, |acc, c| {
let red = acc.red.max(c.red);
let green = acc.green.max(c.green);
let blue = acc.blue.max(c.blue);
CubeSet { red, green, blue }
})(s)
}
fn parse_line(s: &str) -> IResult<&str, CubeSet> {
preceded(
tuple((tag("Game "), nom_usize, tag(": "))),
parse_merged_cube_set,
)(s)
}
#[aoc_generator(day2)]
pub fn generator(input: &str) -> Vec<CubeSet> {
process_input(nom_lines(parse_line))(input)
}
#[aoc(day2, part1)]
pub fn part1(inputs: &[CubeSet]) -> usize {
inputs
.iter()
.enumerate()
.map(|(i, cubes)| if cubes.is_valid() { i + 1 } else { 0 })
.sum()
}
#[aoc(day2, part2)]
pub fn part2(inputs: &[CubeSet]) -> usize {
inputs.iter().map(|sets| sets.product()).sum()
}
#[cfg(test)]
mod tests {
use super::*;
const SAMPLE: &str = r"Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
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";
#[test]
pub fn input_test() {
println!("{:?}", generator(SAMPLE));
// assert_eq!(generator(SAMPLE), Object());
}
#[test]
pub fn part1_test() {
assert_eq!(part1(&generator(SAMPLE)), 8);
}
#[test]
pub fn part2_test() {
assert_eq!(part2(&generator(SAMPLE)), 2286);
}
mod regression {
use super::*;
const INPUT: &str = include_str!("../input/2023/day2.txt");
const ANSWERS: (usize, usize) = (2771, 70924);
#[test]
pub fn test() {
let input = INPUT.trim_end_matches('\n');
let output = generator(input);
assert_eq!(part1(&output), ANSWERS.0);
assert_eq!(part2(&output), ANSWERS.1);
}
}
}