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##....#.##.##.#..###...#.#.##..#.#......#...#.#.#.#.#..###.#.....#.##.##..#.###..##..###.##....#####
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#![feature(derive_default_enum)]
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#![feature(test)]
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extern crate test;
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use std::fmt;
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use aoc2021::{
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common::*,
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grid::{draw_ascii, get_boundaries, Boundaries, Grid, HashGrid, Position2D},
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};
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use itertools::Itertools;
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#[derive(Debug, PartialEq, Default, Clone, Copy)]
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enum Pixel {
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Bright,
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#[default]
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Dark,
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}
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#[rustfmt::skip]
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impl fmt::Display for Pixel {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{}", match self { Pixel::Bright => '#', Pixel::Dark => '.' })
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}
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}
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impl From<u8> for Pixel {
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fn from(b: u8) -> Self {
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match b {
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b'#' => Pixel::Bright,
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b'.' => Pixel::Dark,
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_ => unreachable!(),
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}
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}
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}
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const DAY: usize = 20;
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type Parsed = ([Pixel; 512], HashGrid<Pixel, 2>);
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fn parse_input(raw: &str) -> Parsed {
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let (enhance, image) = raw.split_once("\n\n").unwrap();
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// type inference on these methods is absolute magic
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(enhance.bytes().map_into().collect_vec().try_into().unwrap(), HashGrid::from_bytes_2d(image, Pixel::from))
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}
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fn neighbors_plus_self(p: Position2D) -> Vec<Position2D> {
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(-1..=1)
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.rev() // my grid has (0,0) at top left which doesn’t seem to match the task
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.flat_map(|x| (-1..=1).rev().map(move |y| Position2D::from([y, x])))
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.map(|offset| p + offset)
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.collect()
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}
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fn part1((lookup, grid): &Parsed) -> usize {
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let mut grid = grid.to_owned();
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for _ in 0..2 {
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// println!("{}\n{}\n\n", grid.len(), draw_ascii(&grid.fields));
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grid = step(grid, lookup);
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}
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// println!("{}\n{}\n\n", grid.len(), draw_ascii(&grid.fields));
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grid.fields.values().filter(|&&p| p == Pixel::Bright).count()
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}
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fn step(grid: HashGrid<Pixel, 2>, lookup: &[Pixel; 512]) -> HashGrid<Pixel, 2> {
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let Boundaries { x_min, x_max, y_min, y_max } = get_boundaries(&grid.fields.keys().collect_vec());
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println!("{x_min}, {x_max}, {y_min}, {y_max}");
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(x_min - 1..=x_max + 1)
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.flat_map(|x| (y_min - 1..=y_max + 1).map(move |y| Position2D::from([x, y])))
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.map(|p| (p, lookup[lookup_index(p, &grid)]))
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.collect()
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}
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fn lookup_index(p: Position2D, grid: &HashGrid<Pixel, 2>) -> usize {
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let idx =
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neighbors_plus_self(p).into_iter().rev().map(|p| grid.get(&p) == Some(&Pixel::Bright)).fold(0, |acc, n| (acc << 1) | n as usize);
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idx
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}
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fn part2(parsed: &Parsed) -> usize {
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unimplemented!()
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}
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||||
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fn main() {
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let input = parse_input(&read_file(DAY));
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println!("Part 1: {}", part1(&input));
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println!("Part 2: {}", part2(&input));
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use aoc2021::*;
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const TEST_INPUT: &str = "..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
|
||||
|
||||
#..#.
|
||||
#....
|
||||
##..#
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||||
..#..
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||||
..###";
|
||||
|
||||
#[test]
|
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fn lookup_index_test() {
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let grid = HashGrid::from_bytes_2d("...\n#..\n.#.", Pixel::from);
|
||||
let p = Position2D::from([1, 1]);
|
||||
let idx = lookup_index(p, &grid);
|
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assert_eq!(idx, 34);
|
||||
}
|
||||
|
||||
test!(part1() == 35);
|
||||
test!(part2() == 0);
|
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// bench!(part1() == 5573); // too high
|
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bench!(part2() == 0);
|
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bench_input!(|(_, g): &Parsed| g.len() => 10_000);
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}
|
||||
|
|
@ -2,7 +2,7 @@ pub mod cell;
|
|||
pub mod direction;
|
||||
pub mod position;
|
||||
pub use direction::*;
|
||||
use itertools::join;
|
||||
use itertools::{join, Itertools, MinMaxResult};
|
||||
pub use position::*;
|
||||
use std::{collections::HashMap, fmt::Display, hash::BuildHasher};
|
||||
|
||||
|
|
@ -34,7 +34,7 @@ impl<T: Default, const D: usize> Grid<T, D> for HashGrid<T, D> {
|
|||
}
|
||||
}
|
||||
|
||||
impl<T: Default + Copy, const D: usize> HashGrid<T, D> {
|
||||
impl<T: Default + Copy> HashGrid<T, 2> {
|
||||
pub fn from_bytes_2d<F: FnMut(u8) -> T + Copy>(raw: &str, mut f: F) -> HashGrid<T, 2> {
|
||||
raw.lines()
|
||||
.enumerate()
|
||||
|
|
@ -75,18 +75,24 @@ impl<T: Copy> VecGrid<T> {
|
|||
}
|
||||
}
|
||||
|
||||
struct Boundaries {
|
||||
x_min: i64,
|
||||
x_max: i64,
|
||||
y_min: i64,
|
||||
y_max: i64,
|
||||
pub struct Boundaries {
|
||||
pub x_min: i64,
|
||||
pub x_max: i64,
|
||||
pub y_min: i64,
|
||||
pub y_max: i64,
|
||||
}
|
||||
|
||||
fn get_boundaries(input: &[&PositionND<2>]) -> Boundaries {
|
||||
let x_min = input.iter().min_by_key(|k| k.points[0]).map(|p| p.points[0]).unwrap_or(0);
|
||||
let x_max = input.iter().max_by_key(|k| k.points[0]).map(|p| p.points[0]).unwrap_or(0);
|
||||
let y_min = input.iter().min_by_key(|k| k.points[1]).map(|p| p.points[1]).unwrap_or(0);
|
||||
let y_max = input.iter().max_by_key(|k| k.points[1]).map(|p| p.points[1]).unwrap_or(0);
|
||||
pub fn get_boundaries(input: &[&PositionND<2>]) -> Boundaries {
|
||||
let (x_min, x_max) = match input.iter().map(|p| p.points[0]).minmax() {
|
||||
MinMaxResult::NoElements => (0, 0),
|
||||
MinMaxResult::MinMax(min, max) => (min, max),
|
||||
MinMaxResult::OneElement(x) => (x, x),
|
||||
};
|
||||
let (y_min, y_max) = match input.iter().map(|p| p.points[1]).minmax() {
|
||||
MinMaxResult::NoElements => (0, 0),
|
||||
MinMaxResult::MinMax(min, max) => (min, max),
|
||||
MinMaxResult::OneElement(x) => (x, x),
|
||||
};
|
||||
Boundaries { x_min, x_max, y_min, y_max }
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -6,38 +6,25 @@ use std::{
|
|||
ops::{Add, Mul, Sub},
|
||||
};
|
||||
|
||||
pub trait Position
|
||||
where Self: Sized + Hash + PartialEq + Eq + Clone + Copy
|
||||
{
|
||||
fn neighbors(&self) -> Vec<Self>;
|
||||
}
|
||||
|
||||
#[derive(Hash, PartialEq, Eq, Debug, Clone, Copy)]
|
||||
pub struct PositionND<const DIMS: usize> {
|
||||
pub points: [i64; DIMS],
|
||||
}
|
||||
|
||||
pub type Position2D = PositionND<2>;
|
||||
|
||||
impl<I, const D: usize> From<[I; D]> for PositionND<D>
|
||||
where I: TryInto<i64> + Copy
|
||||
{
|
||||
fn from(s: [I; D]) -> Self {
|
||||
let mut points = [0; D];
|
||||
for i in 0..D {
|
||||
points[i] = unwrap_number_result(s[i]);
|
||||
points[i] = s[i].try_into().unwrap_or_else(|_| panic!("number did not fit in target type"))
|
||||
}
|
||||
Self { points }
|
||||
}
|
||||
}
|
||||
|
||||
// because calling .unwrap() on a TryInto result isn’t possible without trait bounds on the
|
||||
// associated Error type.
|
||||
fn unwrap_number_result<I: TryInto<i64>>(i: I) -> i64 {
|
||||
match i.try_into() {
|
||||
Ok(i) => i,
|
||||
_ => panic!("Bad coordinate"),
|
||||
}
|
||||
}
|
||||
|
||||
pub const fn num_neighbors(d: usize) -> usize {
|
||||
3usize.pow(d as u32) - 1
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user