2020: day11: part 1
This commit is contained in:
parent
b94345ea8e
commit
4f98921fd2
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@ -10,6 +10,7 @@ use aoc2020::day07;
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use aoc2020::day08;
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use aoc2020::day09;
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use aoc2020::day10;
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use aoc2020::day11;
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fn aoc2020_all(c: &mut Criterion) {
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c.bench_function("day01", |b| b.iter(|| day01::run().unwrap()));
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@ -22,6 +23,7 @@ fn aoc2020_all(c: &mut Criterion) {
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c.bench_function("day08", |b| b.iter(|| day08::run().unwrap()));
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c.bench_function("day09", |b| b.iter(|| day09::run().unwrap()));
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c.bench_function("day10", |b| b.iter(|| day10::run().unwrap()));
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c.bench_function("day11", |b| b.iter(|| day11::run().unwrap()));
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}
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criterion_group! {
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97
aoc2020/input/day11.txt
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97
aoc2020/input/day11.txt
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LLLLLL.LLLLL.LLLL..LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLL.LLLLL..LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL
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LLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL
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10
aoc2020/input/day11_provided.txt
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10
aoc2020/input/day11_provided.txt
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L.LL.LL.LL
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LLLLLLL.LL
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L.L.L..L..
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LLLL.LL.LL
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L.LL.LL.LL
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L.LLLLL.LL
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..L.L.....
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L.LLLLLL.L
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L.LLLLL.LL
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178
aoc2020/src/day11.rs
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178
aoc2020/src/day11.rs
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use std::fmt::Write;
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use std::mem;
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use aoc::err;
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const INPUT: &str = include_str!("../input/day11.txt");
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pub fn run() -> aoc::Result<String> {
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let mut res = String::with_capacity(128);
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writeln!(res, "part 1: {}", part1(INPUT)?)?;
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Ok(res)
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}
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fn part1(input: &str) -> aoc::Result<usize> {
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let mut layout: Layout = input.parse()?;
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layout.converge();
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Ok(layout.occupied_seats())
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Cell {
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EmptySeat,
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Floor,
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OccupiedSeat,
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}
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type Grid = Vec<Vec<Cell>>;
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struct Layout {
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grid: Grid,
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height: usize,
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width: usize,
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}
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impl Layout {
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/// Steps one round in the simulation, returns the previous grid
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fn step(&mut self) -> Grid {
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let grid = &self.grid;
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let mut new = grid.clone();
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for i in 0..self.height {
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for j in 0..self.width {
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let cell = self[i][j];
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match cell {
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Cell::EmptySeat => {
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if self.count_adjacent(i, j, Cell::OccupiedSeat) == 0 {
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new[i][j] = Cell::OccupiedSeat;
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}
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}
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Cell::OccupiedSeat => {
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if self.count_adjacent(i, j, Cell::OccupiedSeat) >= 4 {
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new[i][j] = Cell::EmptySeat;
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}
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}
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_ => {}
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}
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}
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}
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mem::replace(&mut self.grid, new)
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}
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/// Steps through the simulation until a fixpoint is reached
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fn converge(&mut self) {
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let mut prev = self.step();
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while prev != self.grid {
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prev = self.step();
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}
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}
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const OFFSETS: &'static [(i8, i8)] = &[
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(0, -1),
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(0, 1),
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(-1, 0),
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(1, 0),
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(-1, -1),
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(-1, 1),
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(1, -1),
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(1, 1),
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];
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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);
|
||||
}
|
||||
}
|
|
@ -8,3 +8,4 @@ pub mod day07;
|
|||
pub mod day08;
|
||||
pub mod day09;
|
||||
pub mod day10;
|
||||
pub mod day11;
|
||||
|
|
|
@ -11,6 +11,7 @@ use aoc2020::day07;
|
|||
use aoc2020::day08;
|
||||
use aoc2020::day09;
|
||||
use aoc2020::day10;
|
||||
use aoc2020::day11;
|
||||
|
||||
fn main() -> Result<()> {
|
||||
let days: &[DayFunc] = &[
|
||||
|
@ -24,6 +25,7 @@ fn main() -> Result<()> {
|
|||
day08::run,
|
||||
day09::run,
|
||||
day10::run,
|
||||
day11::run,
|
||||
];
|
||||
|
||||
aoc::run(days)
|
||||
|
|
Loading…
Reference in a new issue