65 lines
1.3 KiB
Rust
65 lines
1.3 KiB
Rust
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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::HashSet;
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struct Card {
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id: usize,
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winning_nums: HashSet<usize>,
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nums: HashSet<usize>
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}
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impl Card {
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fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
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let nums = just(" ")
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.repeated()
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.ignore_then(int(10))
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.separated_by(just(" "))
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.map(|nums| {
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nums.into_iter()
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.map(|num: String| num.parse().unwrap())
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.collect::<HashSet<usize>>()
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});
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just("Card")
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.ignore_then(just(" ").repeated())
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.ignore_then(int(10))
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.then_ignore(just(": "))
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.then(nums)
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.then_ignore(just(" | "))
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.then(nums)
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.map(|((id, winning_nums), nums): ((String, _), _)| Self {
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id: id.parse().unwrap(),
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winning_nums,
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nums
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})
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}
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}
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fn parser() -> impl Parser<char, Vec<Card>, Error = Simple<char>> {
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Card::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 cards = read("inputs/day4.txt", parser())?;
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let mut points = 0;
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for card in &cards {
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let matches = card
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.nums
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.iter()
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.filter(|num| card.winning_nums.contains(num))
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.count();
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if matches > 0 {
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points += 1 << (matches - 1);
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}
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}
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println!("{points}");
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Ok(())
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}
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