day-19 part 1 done

2023/day-19/src/lib.rs

@@ -0,0 +1,4 @@
+pub mod part1;
+pub use crate::part1::*;
+pub mod part2;
+pub use crate::part2::*;

2023/day-19/src/main.rs

@@ -0,0 +1,12 @@
+#![warn(clippy::all, clippy::pedantic)]
+
+use day_19::part1;
+use day_19::part2;
+
+fn main() {
+    let input = include_str!("./input.txt");
+    let part1_result = part1(input);
+    println!("part 1: {part1_result}");
+    let part2_result = part2(input);
+    println!("part 2: {part2_result}");
+}

2023/day-19/src/part1.rs

@@ -0,0 +1,205 @@
+#![warn(clippy::all, clippy::pedantic)]
+
+use std::{collections::HashMap, iter::successors};
+
+use nom::{
+    branch::alt,
+    bytes::complete::tag,
+    character::complete,
+    multi::{fold_many1, separated_list1},
+    sequence::{delimited, preceded, separated_pair, terminated, tuple},
+    IResult, Parser,
+};
+
+type ParserReturn<'a> = (HashMap<OpLabel<'a>, Vec<Op<'a>>>, Vec<Part>);
+
+#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)]
+struct Part {
+    pub x: u32,
+    pub m: u32,
+    pub a: u32,
+    pub s: u32,
+}
+
+impl Part {
+    fn rating(&self) -> u32 {
+        self.x + self.m + self.a + self.s
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)]
+enum RatingType {
+    ExtremelyCool,
+    Musical,
+    AeroDynamic,
+    Shiny,
+}
+
+#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)]
+enum OpLabel<'a> {
+    Accept,
+    Reject,
+    Workflow(&'a str),
+}
+
+#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)]
+enum Op<'a> {
+    Goto(OpLabel<'a>),
+    Greater(RatingType, u32, OpLabel<'a>),
+    Less(RatingType, u32, OpLabel<'a>),
+}
+
+/// day 19 part 1 of aoc 2023
+///
+/// # Arguments
+/// - input the input for today's puzzle
+///
+/// # Panics
+/// panics whne it cannot parse the input OR when ever the number of game numbers is greater than
+#[must_use]
+pub fn part1(input: &str) -> String {
+    let (_, (workflows, parts)) = parse_input(input).expect("valid aoc input");
+    parts
+        .iter()
+        .filter_map(|part| {
+            (successors(Some(OpLabel::Workflow("in")), |label| {
+                if *label == OpLabel::Accept || *label == OpLabel::Reject {
+                    return None;
+                }
+                let workflow = dbg!(workflows.get(label)).unwrap();
+                workflow
+                    .iter()
+                    .find_map(|op| match op {
+                        Op::Goto(label) => Some(label),
+                        Op::Greater(rating_type, value, label) => (match rating_type {
+                            RatingType::ExtremelyCool => part.x,
+                            RatingType::Musical => part.m,
+                            RatingType::AeroDynamic => part.a,
+                            RatingType::Shiny => part.s,
+                        } > *value)
+                            .then_some(label),
+                        Op::Less(rating_type, value, label) => (match rating_type {
+                            RatingType::ExtremelyCool => part.x,
+                            RatingType::Musical => part.m,
+                            RatingType::AeroDynamic => part.a,
+                            RatingType::Shiny => part.s,
+                        } < *value)
+                            .then_some(label),
+                    })
+                    .copied()
+            })
+            .last()
+            .unwrap()
+                == OpLabel::Accept)
+                .then_some(part.rating())
+        })
+        .sum::<u32>()
+        .to_string()
+}
+
+fn parse_op_label(input: &str) -> IResult<&str, OpLabel> {
+    alt((
+        tag("A").map(|_| OpLabel::Accept),
+        tag("R").map(|_| OpLabel::Reject),
+        complete::alpha1.map(OpLabel::Workflow),
+    ))(input)
+}
+
+fn parse_rating_type(input: &str) -> IResult<&str, RatingType> {
+    alt((
+        tag("x").map(|_| RatingType::ExtremelyCool),
+        tag("m").map(|_| RatingType::Musical),
+        tag("a").map(|_| RatingType::AeroDynamic),
+        tag("s").map(|_| RatingType::Shiny),
+    ))(input)
+}
+
+fn parse_op(input: &str) -> IResult<&str, Op> {
+    alt((
+        separated_pair(
+            separated_pair(parse_rating_type, tag("<"), complete::u32),
+            tag(":"),
+            parse_op_label,
+        )
+        .map(|((typ, value), to)| Op::Less(typ, value, to)),
+        separated_pair(
+            separated_pair(parse_rating_type, tag(">"), complete::u32),
+            tag(":"),
+            parse_op_label,
+        )
+        .map(|((typ, value), to)| Op::Greater(typ, value, to)),
+        parse_op_label.map(Op::Goto),
+    ))(input)
+}
+
+fn parse_workflow(input: &str) -> IResult<&str, (OpLabel, Vec<Op>)> {
+    let (input, label) =
+        complete::alpha1(input).map(|(input, label)| (input, OpLabel::Workflow(label)))?;
+    let (input, ops) = delimited(tag("{"), separated_list1(tag(","), parse_op), tag("}"))(input)?;
+    Ok((input, (label, ops)))
+}
+
+fn parse_workflows(input: &str) -> IResult<&str, HashMap<OpLabel, Vec<Op>>> {
+    fold_many1(
+        terminated(parse_workflow, complete::line_ending),
+        HashMap::new,
+        |mut acc, (label, ops)| {
+            acc.insert(label, ops);
+            acc
+        },
+    )(input)
+}
+
+fn parse_rating(input: &str) -> IResult<&str, Part> {
+    delimited(
+        tag("{"),
+        tuple((
+            delimited(tag("x="), complete::u32, tag(",")),
+            delimited(tag("m="), complete::u32, tag(",")),
+            delimited(tag("a="), complete::u32, tag(",")),
+            preceded(tag("s="), complete::u32),
+        ))
+        .map(|(x, m, a, s)| Part { x, m, a, s }),
+        tag("}"),
+    )(input)
+}
+
+fn parse_parts(input: &str) -> IResult<&str, Vec<Part>> {
+    separated_list1(complete::line_ending, parse_rating)(input)
+}
+
+fn parse_input(input: &str) -> IResult<&str, ParserReturn> {
+    let (input, workflows) = parse_workflows(input)?;
+    let (input, _) = complete::line_ending(input)?;
+    let (input, parts) = parse_parts(input)?;
+    Ok((input, (workflows, parts)))
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const INPUT: &str = "px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}";
+
+    #[test]
+    fn part1_works() {
+        let result = part1(INPUT);
+        assert_eq!(result, "19114".to_string());
+    }
+}

2023/day-19/src/part2.rs

@@ -0,0 +1,19 @@
+#![warn(clippy::all, clippy::pedantic)]
+
+#[must_use]
+pub fn part2(_input: &str) -> String {
+    "Not Finished".to_string()
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const INPUT: &str = "";
+
+    #[test]
+    fn part2_works() {
+        let result = part2(INPUT);
+        assert_eq!(result, "Not Finished".to_string());
+    }
+}