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day 11 part 1

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Dominic 2023-12-11 11:08:43 +01:00
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commit c6fc7ded50
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#![forbid(elided_lifetimes_in_paths, unsafe_code)]
use aoc23::read;
use chumsky::prelude::*;
use std::collections::HashSet;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum Cell {
Void,
Galaxy
}
impl Cell {
fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
choice((
just('.').map(|_| Self::Void),
just('#').map(|_| Self::Galaxy)
))
}
}
fn parser() -> impl Parser<char, Vec<Vec<Cell>>, Error = Simple<char>> {
Cell::parser()
.repeated()
.then_ignore(just("\n"))
.repeated()
.then_ignore(end())
}
fn main() -> anyhow::Result<()> {
let universe = read("inputs/day11.txt", parser())?;
let empty_rows: HashSet<usize> = universe
.iter()
.enumerate()
.filter(|(_, row)| row.iter().all(|cell| *cell == Cell::Void))
.map(|(i, _)| i)
.collect();
let empty_cols: HashSet<usize> = universe
.first()
.unwrap()
.iter()
.enumerate()
.map(|(i, _)| i)
.filter(|i| universe.iter().all(|row| row[*i] == Cell::Void))
.collect();
let galaxies: Vec<(usize, usize)> = universe
.iter()
.enumerate()
.flat_map(|(i, row)| row.iter().enumerate().map(move |(j, cell)| (i, j, *cell)))
.filter(|(_, _, cell)| *cell == Cell::Galaxy)
.map(|(i, j, _)| (i, j))
.collect();
let mut sum = 0_u64;
for (i, g) in galaxies.iter().enumerate() {
for (_j, h) in galaxies.iter().enumerate().skip(i + 1) {
let mut x = [g.0, h.0];
x.sort_unstable();
let mut dist = (x[0] .. x[1])
.map(|row| match empty_rows.contains(&row) {
true => 2,
false => 1
})
.sum::<u64>();
let mut y = [g.1, h.1];
y.sort_unstable();
dist += (y[0] .. y[1])
.map(|col| match empty_cols.contains(&col) {
true => 2,
false => 1
})
.sum::<u64>();
// eprintln!(" - Between galaxy {} and galaxy {}: {dist}", i + 1, _j + 1);
sum += dist;
}
}
println!("{sum}");
Ok(())
}