Add 2020/11 part 1

This commit is contained in:
kageru 2020-12-11 12:04:38 +01:00
parent c70f62f4cb
commit cd4f399ed6
4 changed files with 275 additions and 7 deletions

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@ -8,7 +8,7 @@ sed -i -e '$a\' inputs/day$today
echo '#![feature(test)]
extern crate test;
use aoc::common::*;
use aoc2020::common::*;
type Parsed = Vec<usize>;
@ -44,9 +44,9 @@ mod tests {
const TEST_INPUT: &str = "";
test!(part1 == 0);
test!(part2 == 0);
bench!(part1 == 0);
bench!(part2 == 0);
test!(part1() == 0);
test!(part2() == 0);
bench!(part1() == 0);
bench!(part2() == 0);
bench_input!(len == 0);
}' > src/bin/day$today.rs

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2020/src/bin/day11.rs Normal file
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#![feature(test)]
extern crate test;
use aoc2020::{common::*, grid::*};
use std::{
collections::HashMap, fmt::{self, Display, Formatter}
};
#[derive(Debug, PartialEq, Clone, Copy)]
enum Tile {
Floor,
Empty,
Occupied,
}
impl Display for Tile {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_str(match self {
Tile::Floor => ".",
Tile::Empty => "L",
Tile::Occupied => "#",
})
}
}
impl From<char> for Tile {
fn from(c: char) -> Self {
match c {
'.' => Tile::Floor,
'L' => Tile::Empty,
'#' => Tile::Occupied,
_ => unreachable!(),
}
}
}
impl Default for &Tile {
fn default() -> Self {
&Tile::Floor
}
}
impl Default for Tile {
fn default() -> Self {
Tile::Floor
}
}
type Parsed = HashMap<Position2D, Tile>;
fn read_input() -> String {
read_file(11)
}
fn parse_input(raw: &str) -> Parsed {
raw.lines()
.enumerate()
.flat_map(move |(y, l)| {
l.chars()
.enumerate()
.map(move |(x, c)| (Position2D { x: x as i64, y: y as i64 }, Tile::from(c)))
})
.collect()
}
fn occupied_neighbors(pos: &Position2D, grid: &Parsed) -> usize {
pos.moore()
.iter()
.filter(|p| grid.get(&p).unwrap_or_default() == &Tile::Occupied)
.count()
}
fn make_step(previous: &Parsed) -> (Parsed, bool) {
let mut grid = previous.to_owned();
let mut changed = false;
for (pos, tile) in grid.iter_mut() {
match tile {
Tile::Floor => (),
Tile::Empty => {
if occupied_neighbors(&pos, &previous) == 0 {
*tile = Tile::Occupied;
changed = true;
}
}
Tile::Occupied => {
if occupied_neighbors(&pos, &previous) >= 4 {
*tile = Tile::Empty;
changed = true;
}
}
}
}
(grid, changed)
}
fn part1(parsed: &Parsed) -> usize {
let mut p = parsed.to_owned();
loop {
let (parsed, changed) = make_step(&p);
if !changed {
break;
}
// println!("{}", draw_ascii(&parsed));
p = parsed;
}
p.iter().filter(|(_, t)| t == &&Tile::Occupied).count()
}
const DIRECTIONS: [(i64, i64); 8] = [(0, 1), (1, 0), (1, 1), (0, -1), (-1, 0), (-1, -1), (-1, 1), (1, -1)];
fn part2(parsed: &Parsed) -> usize {
unimplemented!()
}
fn main() {
let input = parse_input(&read_input());
println!("Part 1: {}", part1(&input));
// println!("Part 2: {}", part2(&input));
}
#[cfg(test)]
mod tests {
use super::*;
use aoc2020::*;
use paste::paste;
use test::black_box;
const TEST_INPUT: &str = "L.LL.LL.LL
LLLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLLL
L.LLLLLL.L
L.LLLLL.LL";
const AFTER_1_STEP: &str = "#.##.##.##
#######.##
#.#.#..#..
####.##.##
#.##.##.##
#.#####.##
..#.#.....
##########
#.######.#
#.#####.##";
const AFTER_2_STEPS: &str = "#.LL.L#.##
#LLLLLL.L#
L.L.L..L..
#LLL.LL.L#
#.LL.LL.LL
#.LLLL#.##
..L.L.....
#LLLLLLLL#
#.LLLLLL.L
#.#LLLL.##";
#[test]
fn step_test() {
let input = parse_input(TEST_INPUT);
let (first_step, changed) = make_step(&input);
let after_first = parse_input(AFTER_1_STEP);
assert_eq!(draw_ascii(&first_step, Tile::Floor), draw_ascii(&after_first, Tile::Floor));
assert_eq!((&first_step, changed), (&after_first, true));
let (second_step, changed) = make_step(&first_step);
let after_second = parse_input(AFTER_2_STEPS);
assert_eq!((second_step, changed), (after_second, true));
}
test!(part1() == 37);
//test!(part2() == 0);
//bench!(part1() == 0);
//bench!(part2() == 0);
//bench_input!(len == 0);
}

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@ -34,12 +34,12 @@ fn get_boundaries(input: &[&Position2D]) -> Boundaries {
Boundaries { x_min, x_max, y_min, y_max }
}
pub fn draw_ascii<T: Display, S: BuildHasher>(coordinates: &HashMap<Position2D, T, S>, default: T) -> String {
pub fn draw_ascii<T: Display + Default, S: BuildHasher>(coordinates: &HashMap<Position2D, T, S>) -> String {
let b = get_boundaries(&coordinates.keys().collect::<Vec<_>>());
join(
(b.y_min..=b.y_max).rev().map(|y| {
(b.x_min..=b.x_max)
.map(|x| coordinates.get(&(x, y).into()).unwrap_or(&default).to_string())
.map(|x| coordinates.get(&(x, y).into()).unwrap_or(&T::default()).to_string())
.collect::<String>()
}),
"\n",