day 3 part 1
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3 changed files with 236 additions and 0 deletions
140
inputs/day3.txt
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140
inputs/day3.txt
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86
src/bin/day3.rs
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86
src/bin/day3.rs
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#![forbid(elided_lifetimes_in_paths, unsafe_code)]
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use aoc23::read;
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use chumsky::{prelude::*, text::int};
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use std::collections::HashMap;
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enum Entity {
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Void,
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Symbol(char),
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Number { num: usize, len: usize }
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}
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impl Entity {
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fn len(&self) -> usize {
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match self {
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Self::Void | Self::Symbol(_) => 1,
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Self::Number { len, .. } => *len
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}
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}
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fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
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choice((
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just('.').map(|_| Self::Void),
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int(10).map(|num: String| Self::Number {
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num: num.parse().unwrap(),
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len: num.len()
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}),
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none_of(['\n']).map(Self::Symbol)
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))
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}
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}
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struct Line {
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entities: HashMap<usize, Entity>
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}
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impl Line {
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fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
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Entity::parser().repeated().map(|line| {
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let mut col = 0;
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let mut entities = HashMap::new();
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for ent in line {
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let len = ent.len();
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entities.insert(col, ent);
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col += len;
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}
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Line { entities }
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})
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}
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}
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fn parser() -> impl Parser<char, Vec<Line>, Error = Simple<char>> {
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Line::parser()
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.then_ignore(just("\n"))
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.repeated()
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.then_ignore(end())
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}
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fn main() -> anyhow::Result<()> {
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let grid = read("inputs/day3.txt", parser())?;
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let mut sum = 0;
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for (i, line) in grid.iter().enumerate() {
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'entities: for (col, ent) in &line.entities {
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let Entity::Number { num, len } = ent else {
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continue;
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};
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// see if adjacent
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for search_row in i.saturating_sub(1) ..= i + 1 {
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let Some(row) = grid.get(search_row) else {
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continue;
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};
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for search_col in col.saturating_sub(1) ..= col + len {
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if let Some(Entity::Symbol(_)) = row.entities.get(&search_col) {
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sum += num;
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continue 'entities;
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}
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}
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}
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}
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}
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println!("{sum}");
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Ok(())
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}
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10
src/lib.rs
10
src/lib.rs
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anyhow!("Failed to parse input")
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})
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}
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pub fn read_from_str<C, T>(from: &str, parser: C) -> anyhow::Result<T>
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where
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C: Parser<char, T, Error = Simple<char>>
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{
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parser.parse(from).map_err(|errors| {
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report_err(from, "<input>", errors);
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anyhow!("Failed to parse input")
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})
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}
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Reference in a new issue