2020: day24: part 1
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@ -22,6 +22,7 @@ use aoc2020::day19;
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use aoc2020::day21;
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use aoc2020::day21;
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use aoc2020::day22;
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use aoc2020::day22;
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use aoc2020::day23;
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use aoc2020::day23;
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use aoc2020::day24;
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fn aoc2020_all(c: &mut Criterion) {
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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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c.bench_function("day01", |b| b.iter(|| day01::run().unwrap()));
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@ -46,6 +47,7 @@ fn aoc2020_all(c: &mut Criterion) {
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c.bench_function("day21", |b| b.iter(|| day21::run().unwrap()));
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c.bench_function("day21", |b| b.iter(|| day21::run().unwrap()));
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c.bench_function("day22", |b| b.iter(|| day22::run().unwrap()));
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c.bench_function("day22", |b| b.iter(|| day22::run().unwrap()));
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c.bench_function("day23", |b| b.iter(|| day23::run().unwrap()));
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c.bench_function("day23", |b| b.iter(|| day23::run().unwrap()));
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c.bench_function("day24", |b| b.iter(|| day24::run().unwrap()));
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}
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}
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criterion_group! {
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criterion_group! {
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608
aoc2020/input/day24.txt
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608
aoc2020/input/day24.txt
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@ -0,0 +1,608 @@
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|
neneswnwnwnwnwnenwnenwenwnwnwnesenwnenw
|
||||||
|
nwnwswswswewswswswswswswswseswswswswsw
|
||||||
|
weeeeeeenee
|
||||||
|
swnwswswsenwseneswseeseswswneseseswswnwse
|
||||||
|
swswwseseswswneswseswswneswseseneswswsw
|
||||||
|
weesweneseweeenesewesweneesee
|
||||||
|
seswswswseseseseseseseneseswsesenwesese
|
||||||
|
eweneseeeseneewnwneeeneneenese
|
||||||
|
swwnenwswwnwnwnwnwswwswenweenwnww
|
||||||
|
nwwwwwswwswwwwwswswswwswswwe
|
||||||
|
eneenwneseseeneneeenwseneswneenew
|
||||||
|
sesesewneswnwnenewneseeneswnwnenweew
|
||||||
|
eswswswsenwnwnwnewswnenwseswnenwnenee
|
||||||
|
enwwwesweeeeeeeeseeseeeeee
|
||||||
|
eseeeeeeeseeeneseswwseeeeee
|
||||||
|
nwnenenenenenwnenenenenwneswsenwse
|
||||||
|
weseseseeseseseseseseseeeenesewse
|
||||||
|
neeneeeweeesweeswenweeswnwenw
|
||||||
|
nwwwneswswwswswewewwseswswswww
|
||||||
|
nenewnenenwnwnwnwnwnenwnwnenenesenwnwnw
|
||||||
|
esesesenesewseseneseseswsese
|
||||||
|
sesweswneneneneswwnewnwnenweenenenwsw
|
||||||
|
nwneneswnwswswwnewneneneseseenwsewnese
|
||||||
|
wneseewnwnwenwnesenwwseseswwnewnwe
|
||||||
|
senwwsweeesenwse
|
||||||
|
wnewwnewsewwnwseswwwswnewwwsw
|
||||||
|
nwnwwnwnenwnwnwnenwnwwnwsenenwsenwsenw
|
||||||
|
enwwwwnwwnwnwwwnww
|
||||||
|
wwnwnwswewneenw
|
||||||
|
wnewewswwwwnwswwswswseswswwnesw
|
||||||
|
wneenweweneeweseeeeseeeseee
|
||||||
|
eeswswweeeneseeeneenwswseseenw
|
||||||
|
nenenenwnwnwnwnwnwswnwnewnwnenwnwnwenwne
|
||||||
|
nwswswsenwseswnesewnwswswswswseswneswsw
|
||||||
|
seeweeeeeseseseseeneseseseseswse
|
||||||
|
sesewneseswneseeseswseesewwswsesesw
|
||||||
|
nweneswsesenewweseswwneseneeseswswe
|
||||||
|
senwseseswsesesesenwesenwsesesewesesesw
|
||||||
|
eneneneeenwnwnwnwseseweneswse
|
||||||
|
neswneswnenenewswnesenwnenenenenwnwnesw
|
||||||
|
neswswseswswseswswseweswswseswswswswsesww
|
||||||
|
neeeeeweneesw
|
||||||
|
eneneeeeneswnene
|
||||||
|
swswswswneswswswswsewswswswnwseswneswswsw
|
||||||
|
wnwesweneneseseneweeesewswwwnwe
|
||||||
|
wnwewwwnwnwwnwwenwsewswnwswww
|
||||||
|
neeswnenwnenwsenwnenewweswsenenwnwswnw
|
||||||
|
nwswnwnwwnwnwnenwnwenw
|
||||||
|
swneswswswswwswswswswswswswwswswsw
|
||||||
|
swnwwnenwneswneenenenenenenwseeeesesw
|
||||||
|
wnwnwnwnwnwnwnwnenwnwnwnwnwswwswnwnenwnw
|
||||||
|
seswswnenwseswnwsesweseseseseswseneesww
|
||||||
|
seewnwnwswneweswwwenewwewsenwse
|
||||||
|
swswseswswswswnwswweswseswseneseswswsw
|
||||||
|
neneneeeneeseeswsweeeewneeeenw
|
||||||
|
swseswseswswswneneseswneswnwne
|
||||||
|
neeeneeneneneneneswnwenene
|
||||||
|
swsewewnwnwnenewnewnwwseewseesese
|
||||||
|
nwnwnwewnenwenwewnwnwnwnwnwswnwnwnwnw
|
||||||
|
nwwweeeeseswseseseseesenweseewe
|
||||||
|
sesesewswsweseseswseswswseseswswneenwnw
|
||||||
|
nenenenenenenwneneneseswneneneswne
|
||||||
20
aoc2020/input/day24_provided.txt
Normal file
20
aoc2020/input/day24_provided.txt
Normal file
|
|
@ -0,0 +1,20 @@
|
||||||
|
sesenwnenenewseeswwswswwnenewsewsw
|
||||||
|
neeenesenwnwwswnenewnwwsewnenwseswesw
|
||||||
|
seswneswswsenwwnwse
|
||||||
|
nwnwneseeswswnenewneswwnewseswneseene
|
||||||
|
swweswneswnenwsewnwneneseenw
|
||||||
|
eesenwseswswnenwswnwnwsewwnwsene
|
||||||
|
sewnenenenesenwsewnenwwwse
|
||||||
|
wenwwweseeeweswwwnwwe
|
||||||
|
wsweesenenewnwwnwsenewsenwwsesesenwne
|
||||||
|
neeswseenwwswnwswswnw
|
||||||
|
nenwswwsewswnenenewsenwsenwnesesenew
|
||||||
|
enewnwewneswsewnwswenweswnenwsenwsw
|
||||||
|
sweneswneswneneenwnewenewwneswswnese
|
||||||
|
swwesenesewenwneswnwwneseswwne
|
||||||
|
enesenwswwswneneswsenwnewswseenwsese
|
||||||
|
wnwnesenesenenwwnenwsewesewsesesew
|
||||||
|
nenewswnwewswnenesenwnesewesw
|
||||||
|
eneswnwswnwsenenwnwnwwseeswneewsenese
|
||||||
|
neswnwewnwnwseenwseesewsenwsweewe
|
||||||
|
wseweeenwnesenwwwswnew
|
||||||
144
aoc2020/src/day24.rs
Normal file
144
aoc2020/src/day24.rs
Normal file
|
|
@ -0,0 +1,144 @@
|
||||||
|
use std::collections::HashSet;
|
||||||
|
use std::fmt::Write;
|
||||||
|
|
||||||
|
use anyhow::{bail, Context, Result};
|
||||||
|
|
||||||
|
const INPUT: &str = include_str!("../input/day24.txt");
|
||||||
|
|
||||||
|
pub fn run() -> Result<String> {
|
||||||
|
let mut res = String::with_capacity(128);
|
||||||
|
|
||||||
|
writeln!(res, "part 1: {}", part1(INPUT)?)?;
|
||||||
|
|
||||||
|
Ok(res)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn part1(input: &str) -> Result<usize> {
|
||||||
|
let mut black_tiles = HashSet::new();
|
||||||
|
|
||||||
|
for line in input.lines() {
|
||||||
|
let mut line = line;
|
||||||
|
let mut tile_pos = HexCoordinates::default();
|
||||||
|
|
||||||
|
// compute tile coordinates by going through the whole line
|
||||||
|
while !line.is_empty() {
|
||||||
|
match line.chars().next().unwrap() {
|
||||||
|
'e' => {
|
||||||
|
tile_pos = tile_pos.east();
|
||||||
|
line = &line[1..];
|
||||||
|
}
|
||||||
|
'w' => {
|
||||||
|
tile_pos = tile_pos.west();
|
||||||
|
line = &line[1..];
|
||||||
|
}
|
||||||
|
'n' => {
|
||||||
|
match line
|
||||||
|
.chars()
|
||||||
|
.nth(1)
|
||||||
|
.context("invalid input, missing char after `n`")?
|
||||||
|
{
|
||||||
|
'e' => tile_pos = tile_pos.north_east(),
|
||||||
|
'w' => tile_pos = tile_pos.north_west(),
|
||||||
|
other => bail!("unexpected character in input: `{}`", other),
|
||||||
|
}
|
||||||
|
|
||||||
|
line = &line[2..];
|
||||||
|
}
|
||||||
|
's' => {
|
||||||
|
match line
|
||||||
|
.chars()
|
||||||
|
.nth(1)
|
||||||
|
.context("invalid input, missing char after `s`")?
|
||||||
|
{
|
||||||
|
'e' => tile_pos = tile_pos.south_east(),
|
||||||
|
'w' => tile_pos = tile_pos.south_west(),
|
||||||
|
other => bail!("unexpected character in input: `{}`", other),
|
||||||
|
}
|
||||||
|
|
||||||
|
line = &line[2..];
|
||||||
|
}
|
||||||
|
other => bail!("unexpected character in input: `{}`", other),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if black_tiles.contains(&tile_pos) {
|
||||||
|
black_tiles.remove(&tile_pos);
|
||||||
|
} else {
|
||||||
|
black_tiles.insert(tile_pos);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(black_tiles.len())
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Hexagonal tile coordinate representation
|
||||||
|
///
|
||||||
|
/// These use the axial coordinates described here:
|
||||||
|
///
|
||||||
|
/// https://www.redblobgames.com/grids/hexagons/#coordinates-axial
|
||||||
|
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
|
||||||
|
struct HexCoordinates {
|
||||||
|
q: i64,
|
||||||
|
r: i64,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl HexCoordinates {
|
||||||
|
fn east(self) -> Self {
|
||||||
|
Self {
|
||||||
|
q: self.q + 1,
|
||||||
|
r: self.r,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn west(self) -> Self {
|
||||||
|
Self {
|
||||||
|
q: self.q - 1,
|
||||||
|
r: self.r,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn north_west(self) -> Self {
|
||||||
|
Self {
|
||||||
|
q: self.q,
|
||||||
|
r: self.r - 1,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn south_east(self) -> Self {
|
||||||
|
Self {
|
||||||
|
q: self.q,
|
||||||
|
r: self.r + 1,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn north_east(self) -> Self {
|
||||||
|
self.north_west().east()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn south_west(self) -> Self {
|
||||||
|
self.south_east().west()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Default for HexCoordinates {
|
||||||
|
fn default() -> Self {
|
||||||
|
Self { q: 0, r: 0 }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
const PROVIDED: &str = include_str!("../input/day24_provided.txt");
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part1_provided() {
|
||||||
|
assert_eq!(part1(PROVIDED).unwrap(), 10);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn part1_real() {
|
||||||
|
assert_eq!(part1(INPUT).unwrap(), 528);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -22,3 +22,4 @@ pub mod day19;
|
||||||
pub mod day21;
|
pub mod day21;
|
||||||
pub mod day22;
|
pub mod day22;
|
||||||
pub mod day23;
|
pub mod day23;
|
||||||
|
pub mod day24;
|
||||||
|
|
|
||||||
|
|
@ -24,6 +24,7 @@ use aoc2020::day19;
|
||||||
use aoc2020::day21;
|
use aoc2020::day21;
|
||||||
use aoc2020::day22;
|
use aoc2020::day22;
|
||||||
use aoc2020::day23;
|
use aoc2020::day23;
|
||||||
|
use aoc2020::day24;
|
||||||
|
|
||||||
fn main() -> Result<()> {
|
fn main() -> Result<()> {
|
||||||
let days: &[DayFunc] = &[
|
let days: &[DayFunc] = &[
|
||||||
|
|
@ -49,6 +50,7 @@ fn main() -> Result<()> {
|
||||||
day21::run,
|
day21::run,
|
||||||
day22::run,
|
day22::run,
|
||||||
day23::run,
|
day23::run,
|
||||||
|
day24::run,
|
||||||
];
|
];
|
||||||
|
|
||||||
aoc::run(days)
|
aoc::run(days)
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue