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2020: day11: part 1

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This commit is contained in:
Antoine Martin 2020-12-11 14:37:14 +01:00
parent b94345ea8e
commit 4f98921fd2
6 changed files with 290 additions and 0 deletions
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2
aoc2020/benches/bench.rs
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@ -10,6 +10,7 @@ use aoc2020::day07;
use aoc2020::day08; use aoc2020::day08;
use aoc2020::day09; use aoc2020::day09;
use aoc2020::day10; use aoc2020::day10;
use aoc2020::day11;
fn aoc2020_all(c: &mut Criterion) { fn aoc2020_all(c: &mut Criterion) {
c.bench_function("day01", |b| b.iter(|| day01::run().unwrap())); c.bench_function("day01", |b| b.iter(|| day01::run().unwrap()));
@ -22,6 +23,7 @@ fn aoc2020_all(c: &mut Criterion) {
c.bench_function("day08", |b| b.iter(|| day08::run().unwrap())); c.bench_function("day08", |b| b.iter(|| day08::run().unwrap()));
c.bench_function("day09", |b| b.iter(|| day09::run().unwrap())); c.bench_function("day09", |b| b.iter(|| day09::run().unwrap()));
c.bench_function("day10", |b| b.iter(|| day10::run().unwrap())); c.bench_function("day10", |b| b.iter(|| day10::run().unwrap()));
c.bench_function("day11", |b| b.iter(|| day11::run().unwrap()));
} }
criterion_group! { criterion_group! {

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aoc2020/input/day11.txt Normal file
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LLLLLL.LLLLL.LLLL..LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLL.LLLLL..LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.L.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
...L....L.LLL.L.L....LL..LL....L.L..L.....L....LLL..L....LL....LLLL.L.........L..LL..............
LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL
LLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL..LLLLLLL.LLLLLL..LLLLLLLLLLLL.LLLLLLLL..LLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLL...L.L..L.LL.L.L...L....L..L.LLL.L..L....L.L.L...LLL..L...LLL..L..LL.L.L.LL.LL..L...L......L.L
LLLLLL.LLLL.LLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLL..LLLLLLLLLLLLLL..LLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
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LLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL
......L.L.L...LLLL.L....L...LL....LL.LL..L.L..L..L..LL.....L..LL...LLL...L.LL.L.L...L.L.......L..
LLLLLL.LLLLLLLLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL..LLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL
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..L...LL..L.LL..L.L.LL.LLLL......L...LLL..L.L.L..L...LL.LLL..L..L....L.L.LLL..L..L...LL...L.L..LL
LLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.L.LLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
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LLLLLL.LLLLLLLLLLL.LLLLLLLLL.LLLLLLLLL.LLLL.LL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
..L.......L.LL..LL..L.L....LLL.L....LL...L.L...L.....L...LL..LL....LL.....LL.L....L..............
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL.LL.LLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLL.LL
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LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LL.......L...L..L.L.LL...LL...........LL.L...L.....LL.......LL....LLL.L.LLL..L.L.L.L...LL..LL....
LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLL..LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
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LLLLLL.LLLLLLLLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLL
L....L.L.L...LL...LL.....L..L.LLLLLL.L...........L..LL.L....L.....LL..LL.L...L..LLL........L.LLL.
LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL..LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LL.L..................L..L..L..L..L...LL....LL.L......L..LL...LL...........LL....LL..L...L.......
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LL.LLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.L.LLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLL.LL.LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLL..L.LLLLL
L...L.LL.....L...L....L...L...L..L.L..L..L..LL.L.LL..L....L.L.L..L.L.L.LL......LL.L.L.LLLLL...L.L
LLLL.L.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLL.LLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.L.LLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL..LLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL
..L..L.....LLL.......LL....L...L..LLL..L.......L......L.L....L..L....LLL.LL.L.....LL...L..LLLL...
LLLLLL.LLLLL.LLLLL.LL.LLLLLL.LLLLLLLLLLLLLLLL..LLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLL.L.LLLL.LLLLLLL
LLL.LL.LLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLL
LLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLL.LLL.LLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LL.LLLLLLLLLLLLLLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LL.LLLLLL..LLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.L.LLLLLL.LLLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLL.LLLLLLL
LLLLLLLLLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLL
...LLLL.LL.L.L........LLL...L.LLL....L.L..LLL.L..L..L...L.L..L...LL..LL.L.LL..LLL.L....L....L.L..
LLLLLL.LLLLL.LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL...LLLLL.LLLLLL.LLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLL.LLLLL.LLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL
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LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLL.LLL.LLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
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LLLLLL.LLLLLLLL.LL.LLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLLLL.LLLLLLL
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.....L.L.LL.....L.L.LL.L...L....LLL........LL.L....LLL..LLL.L..LL..L......L..L...L.L.L.....L.L...
LLLLLLLLLLLLLLLLLL.LL.LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLL..LLLLLLL
LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLL
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10
aoc2020/input/day11_provided.txt Normal file
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@ -0,0 +1,10 @@
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

178
aoc2020/src/day11.rs Normal file
View file

@ -0,0 +1,178 @@
use std::fmt::Write;
use std::mem;
use aoc::err;
const INPUT: &str = include_str!("../input/day11.txt");
pub fn run() -> aoc::Result<String> {
let mut res = String::with_capacity(128);
writeln!(res, "part 1: {}", part1(INPUT)?)?;
Ok(res)
}
fn part1(input: &str) -> aoc::Result<usize> {
let mut layout: Layout = input.parse()?;
layout.converge();
Ok(layout.occupied_seats())
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Cell {
EmptySeat,
Floor,
OccupiedSeat,
}
type Grid = Vec<Vec<Cell>>;
struct Layout {
grid: Grid,
height: usize,
width: usize,
}
impl Layout {
/// Steps one round in the simulation, returns the previous grid
fn step(&mut self) -> Grid {
let grid = &self.grid;
let mut new = grid.clone();
for i in 0..self.height {
for j in 0..self.width {
let cell = self[i][j];
match cell {
Cell::EmptySeat => {
if self.count_adjacent(i, j, Cell::OccupiedSeat) == 0 {
new[i][j] = Cell::OccupiedSeat;
}
}
Cell::OccupiedSeat => {
if self.count_adjacent(i, j, Cell::OccupiedSeat) >= 4 {
new[i][j] = Cell::EmptySeat;
}
}
_ => {}
}
}
}
mem::replace(&mut self.grid, new)
}
/// Steps through the simulation until a fixpoint is reached
fn converge(&mut self) {
let mut prev = self.step();
while prev != self.grid {
prev = self.step();
}
}
const OFFSETS: &'static [(i8, i8)] = &[
(0, -1),
(0, 1),
(-1, 0),
(1, 0),
(-1, -1),
(-1, 1),
(1, -1),
(1, 1),
];
fn count_adjacent(&self, i: usize, j: usize, value: Cell) -> u8 {
let mut count = 0;
for (di, dj) in Self::OFFSETS {
let (i, j) = (i.wrapping_add(*di as usize), j.wrapping_add(*dj as usize));
// only check seat if it's in bounds
count += self
.grid
.get(i)
.map(|line| line.get(j))
.flatten()
.map(|&cell| if cell == value { 1 } else { 0 })
.unwrap_or(0);
}
count
}
fn occupied_seats(&self) -> usize {
self.grid
.iter()
.map(|line| {
line.iter()
.filter(|seat| **seat == Cell::OccupiedSeat)
.count()
})
.sum()
}
}
impl std::ops::Index<usize> for Layout {
type Output = Vec<Cell>;
fn index(&self, idx: usize) -> &Self::Output {
&self.grid[idx]
}
}
impl std::ops::IndexMut<usize> for Layout {
fn index_mut(&mut self, idx: usize) -> &mut Self::Output {
&mut self.grid[idx]
}
}
impl std::str::FromStr for Layout {
type Err = aoc::Error;
fn from_str(s: &str) -> aoc::Result<Self> {
let grid = s
.lines()
.map(|line| {
line.chars()
.map(|c| match c {
'.' => Ok(Cell::Floor),
'L' => Ok(Cell::EmptySeat),
'#' => Ok(Cell::OccupiedSeat),
_ => Err(err!("unknown char `{}`", c)),
})
.collect()
})
.collect::<aoc::Result<Grid>>()?;
let height = grid.len();
let width = grid[0].len();
Ok(Self {
grid,
height,
width,
})
}
}
#[cfg(test)]
mod tests {
use super::*;
const PROVIDED: &str = include_str!("../input/day11_provided.txt");
#[test]
fn part1_provided() {
assert_eq!(part1(PROVIDED).unwrap(), 37);
}
#[test]
fn part1_real() {
assert_eq!(part1(INPUT).unwrap(), 2427);
}
}

1
aoc2020/src/lib.rs
View file

@ -8,3 +8,4 @@ pub mod day07;
pub mod day08; pub mod day08;
pub mod day09; pub mod day09;
pub mod day10; pub mod day10;
pub mod day11;

2
aoc2020/src/main.rs
View file

@ -11,6 +11,7 @@ use aoc2020::day07;
use aoc2020::day08; use aoc2020::day08;
use aoc2020::day09; use aoc2020::day09;
use aoc2020::day10; use aoc2020::day10;
use aoc2020::day11;
fn main() -> Result<()> { fn main() -> Result<()> {
let days: &[DayFunc] = &[ let days: &[DayFunc] = &[
@ -24,6 +25,7 @@ fn main() -> Result<()> {
day08::run, day08::run,
day09::run, day09::run,
day10::run, day10::run,
day11::run,
]; ];
aoc::run(days) aoc::run(days)