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y2024d20p1 really inefficient, got more efficient version now

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This commit is contained in:
Fabian Schmidt 2024-12-20 10:53:03 +01:00
parent a83cef34f0
commit 5ce4e2b51b
7 changed files with 654 additions and 0 deletions
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46
Cargo.lock generated
View File

@ -11,6 +11,31 @@ dependencies = [
"memchr", "memchr",
] ]
[[package]]
name = "crossbeam-deque"
version = "0.8.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9dd111b7b7f7d55b72c0a6ae361660ee5853c9af73f70c3c2ef6858b950e2e51"
dependencies = [
"crossbeam-epoch",
"crossbeam-utils",
]
[[package]]
name = "crossbeam-epoch"
version = "0.9.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
dependencies = [
"crossbeam-utils",
]
[[package]]
name = "crossbeam-utils"
version = "0.8.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
[[package]] [[package]]
name = "either" name = "either"
version = "1.13.0" version = "1.13.0"
@ -42,6 +67,26 @@ version = "2.7.4"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3" checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
[[package]]
name = "rayon"
version = "1.10.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b418a60154510ca1a002a752ca9714984e21e4241e804d32555251faf8b78ffa"
dependencies = [
"either",
"rayon-core",
]
[[package]]
name = "rayon-core"
version = "1.12.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
dependencies = [
"crossbeam-deque",
"crossbeam-utils",
]
[[package]] [[package]]
name = "regex" name = "regex"
version = "1.11.1" version = "1.11.1"
@ -129,6 +174,7 @@ name = "y2024"
version = "0.1.0" version = "0.1.0"
dependencies = [ dependencies = [
"itertools", "itertools",
"rayon",
"regex", "regex",
"utils", "utils",
] ]

1
Cargo.toml
View File

@ -23,3 +23,4 @@ utils = { path = "../utils" }
itertools = "0.13.0" itertools = "0.13.0"
regex = "1.11.1" regex = "1.11.1"
md5 = "0.7.0" md5 = "0.7.0"
rayon = "1.10"

1
y2024/Cargo.toml
View File

@ -7,3 +7,4 @@ edition = "2021"
regex = "1.11.1" regex = "1.11.1"
utils = { workspace = true } utils = { workspace = true }
itertools = { workspace = true } itertools = { workspace = true }
rayon = { workspace = true }

141
y2024/resources/20_input.txt Normal file
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@ -0,0 +1,141 @@
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###.#...#...........#.#...#.#...#.#...#.#.........#.###.....#.#.#.#...#.....#.#...#.......#.#.#.#...#...#...#.#.#.#...#.#...###.............#
###.###.###########.#.#.###.###.#.###.#.#.#########.###.#####.#.#.###.#####.#.###.#.#####.#.#.#.###.#.###.###.#.#.###.#.###.###.###########.#
#...#...###.........#.#.....#...#...#...#.........#...#.#.....#.#.###...#...#.....#.....#...#.#.#...#...#...#.#.#.#...#...#.....#...#...#...#
#.###.#####.#########.#######.#####.#############.###.#.#.#####.#.#####.#.#############.#####.#.#.#####.###.#.#.#.#.#####.#######.#.#.#.#.###
#.....#.....#.....#...#.......#.....#...#.........#...#.#...###.#.#.....#.#...###.......#...#.#.#.#.....#...#...#.#.....#.#.......#.#.#.#...#
#######.#####.###.#.###.#######.#####.#.#.#########.###.###.###.#.#.#####.#.#.###.#######.#.#.#.#.#.#####.#######.#####.#.#.#######.#.#.###.#
#.......#...#.#...#.###...#...#.....#.#.#.......#...###...#.#...#.#.....#...#...#...#...#.#.#.#.#.#.....#.....#...#.....#.#.......#...#...#.#
#.#######.#.#.#.###.#####.#.#.#####.#.#.#######.#.#######.#.#.###.#####.#######.###.#.#.#.#.#.#.#.#####.#####.#.###.#####.#######.#######.#.#
#...#...#.#.#.#...#...#...#.#.....#...#.#.......#.....#...#.#.#...#.....#.......###.#.#.#.#...#.#.#...#.#.....#...#.....#...#.....#.....#.#.#
###.#.#.#.#.#.###.###.#.###.#####.#####.#.###########.#.###.#.#.###.#####.#########.#.#.#.#####.#.#.#.#.#.#######.#####.###.#.#####.###.#.#.#
#...#.#.#.#.#.#...#...#.....#.....#.....#.#.....#.....#.#...#.#...#.#...#.......#...#.#.#.....#.#.#.#...#...#...#.#.....#...#.......#...#...#
#.###.#.#.#.#.#.###.#########.#####.#####.#.###.#.#####.#.###.###.#.#.#.#######.#.###.#.#####.#.#.#.#######.#.#.#.#.#####.###########.#######
#...#.#.#.#.#.#...#.#.......#.....#.....#.#.#...#.....#.#.###...#.#.#.#.#.....#.#.#...#...#...#.#.#...#.....#.#...#.....#.#...#.......#...###
###.#.#.#.#.#.###.#.#.#####.#####.#####.#.#.#.#######.#.#.#####.#.#.#.#.#.###.#.#.#.#####.#.###.#.###.#.#####.#########.#.#.#.#.#######.#.###
#...#.#.#.#.#.#...#.#.#...#.......#...#.#.#.#...#...#.#.#.#...#...#...#.#.###.#.#.#.....#.#.#...#...#.#.....#.#...#...#.#.#.#.#...#.....#...#
#.###.#.#.#.#.#.###.#.#.#.#########.#.#.#.#.###.#.#.#.#.#.#.#.#########.#.###.#.#.#####.#.#.#.#####.#.#####.#.#.#.#.#.#.#.#.#.###.#.#######.#
#.#...#...#.#.#.#...#...#...#...#...#.#.#.#...#.#.#.#.#.#...#...#.......#...#.#.#...#...#.#.#.#.....#.#.....#.#.#...#.#.#.#.#...#...#...#...#
#.#.#######.#.#.#.#########.#.#.#.###.#.#.###.#.#.#.#.#.#######.#.#########.#.#.###.#.###.#.#.#.#####.#.#####.#.#####.#.#.#.###.#####.#.#.###
#.#...#.....#.#.#.#.........#.#.#...#.#.#.#...#.#.#.#.#.#...#...#...#...#...#.#.#...#.#...#.#.#.#.....#.....#.#.....#.#.#.#...#...#...#.#...#
#.###.#.#####.#.#.#.#########.#.###.#.#.#.#.###.#.#.#.#.#.#.#.#####.#.#.#.###.#.#.###.#.###.#.#.#.#########.#.#####.#.#.#.###.###.#.###.###.#
#.....#.......#...#...........#.....#...#...###...#...#...#...#####...#...###...#.....#.....#...#...........#.......#...#.....###...###.....#
#############################################################################################################################################

27
y2024/src/bin/d20.rs Normal file
View File

@ -0,0 +1,27 @@
use std::{fs, time::Instant};
use utils::time::get_elapsed_string;
use y2024::days::d20;
fn main() {
let now = Instant::now();
println!("Part 1:");
part1();
println!("Ran in {}", get_elapsed_string(now.elapsed()));
let now = Instant::now();
println!("Part 2:");
part2();
println!("Ran in {}", get_elapsed_string(now.elapsed()));
}
fn part1() {
let root = env!("CARGO_MANIFEST_DIR");
let content = fs::read_to_string(format!("{root}/resources/20_input.txt")).unwrap();
println!("{}", d20::process_part1(&content));
}
fn part2() {
let root = env!("CARGO_MANIFEST_DIR");
let content = fs::read_to_string(format!("{root}/resources/20_input.txt")).unwrap();
println!("{}", d20::process_part2(&content));
}

436
y2024/src/days/d20.rs Normal file
View File

@ -0,0 +1,436 @@
use std::{
collections::{HashMap, HashSet},
error::Error,
sync::mpsc,
};
use itertools::Itertools;
use rayon::prelude::*;
pub fn process_part1(input: &str) -> u32 {
simulate_all_2(input, 100).values().copied().sum()
//simulate_all(input)
// .iter()
// .map(
// |(time_saved, count)| {
// if *time_saved >= 100 {
// *count
// } else {
// 0
// }
// },
// )
// .sum()
}
fn simulate_all(input: &str) -> HashMap<u32, u32> {
let mut cheats = Vec::new();
let mut start = (0, 0);
let grid = input
.lines()
.enumerate()
.map(|(yidx, row)| {
row.chars()
.enumerate()
.map(|(xidx, chara)| {
let tile = GridTile::try_from(chara).unwrap();
if tile == GridTile::Start {
start = (xidx, yidx);
}
tile
})
.collect_vec()
})
.collect_vec();
grid[1..grid.len() - 1]
.iter()
.enumerate()
.for_each(|(yidx, row)| {
row[1..row.len() - 1]
.iter()
.enumerate()
.for_each(|(xidx, tile)| {
if *tile == GridTile::Wall && cheatable(&grid, (xidx + 1, yidx + 1)) {
cheats.push((xidx + 1, yidx + 1));
}
});
});
let mut saved = HashMap::new();
let no_cheat = simulate(grid.clone(), start, None).unwrap();
let (tx, rx) = mpsc::channel();
cheats.into_par_iter().for_each(|cheat| {
let cheat = simulate(grid.clone(), start, Some(cheat)).unwrap();
let time_saved = no_cheat - cheat;
let _ = tx.send(time_saved);
});
drop(tx);
while let Ok(time_saved) = rx.recv() {
saved
.entry(time_saved)
.and_modify(|count| *count += 1)
.or_insert(1);
}
saved
}
fn cheatable(grid: &[Vec<GridTile>], wall_position: (usize, usize)) -> bool {
let above = grid
.get(wall_position.1 - 1)
.map(|above_row| above_row[wall_position.0]);
let below = grid
.get(wall_position.1 + 1)
.map(|below_row| below_row[wall_position.0]);
let left = grid[wall_position.1].get(wall_position.0 - 1).copied();
let right = grid[wall_position.1].get(wall_position.0 + 1).copied();
[above, below, left, right]
.iter()
.map(|tile| {
if let Some(tile) = tile {
match tile {
GridTile::Wall => 0,
GridTile::Path | GridTile::Start | GridTile::End => 1,
}
} else {
0
}
})
.sum::<u32>()
>= 2
}
fn simulate(
mut grid: Vec<Vec<GridTile>>,
start: (usize, usize),
cheat: Option<(usize, usize)>,
) -> Option<u32> {
if let Some(cheat) = cheat {
grid[cheat.1][cheat.0] = GridTile::Path;
}
let mut visited = HashSet::new();
visited.insert(start);
let mut next_paths = vec![MazeRunner {
coords: start,
visited: visited.clone(),
..Default::default()
}];
let mut arrived: Vec<MazeRunner> = Vec::new();
while !next_paths.is_empty() {
next_paths = next_paths
.iter()
.map(|maze_runner| {
let mut paths = Vec::new();
if let Some(path) = maze_runner.get_next(&grid, Direction::Up) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(&grid, Direction::Down) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(&grid, Direction::Left) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(&grid, Direction::Right) {
paths.push(path);
}
paths
})
.collect_vec()
.concat();
for (idx, maze_runner) in next_paths.clone().iter().enumerate().rev() {
if maze_runner.visited.contains(&maze_runner.coords)
|| visited.contains(&maze_runner.coords)
{
next_paths.remove(idx);
continue;
}
visited.insert(maze_runner.coords);
next_paths[idx].visited.insert(maze_runner.coords);
if maze_runner.state == State::Arrived {
let arrived_reindeer = next_paths.remove(idx);
arrived.push(arrived_reindeer);
}
//log_maze(&grid, maze_runner);
}
}
arrived.sort_by(|a_runner, b_runner| a_runner.visited.len().cmp(&b_runner.visited.len()));
arrived
.first()
.map(|arrived| arrived.visited.len() as u32 - 1)
}
pub fn process_part2(input: &str) -> u32 {
simulate_all_2(input, 100).values().copied().sum()
}
fn simulate_all_2(input: &str, time_to_saved: usize) -> HashMap<u32, u32> {
let mut cheats = Vec::new();
let mut start = (0, 0);
let grid = input
.lines()
.enumerate()
.map(|(yidx, row)| {
row.chars()
.enumerate()
.map(|(xidx, chara)| {
let tile = GridTile::try_from(chara).unwrap();
if tile == GridTile::Start {
start = (xidx, yidx);
}
tile
})
.collect_vec()
})
.collect_vec();
grid[1..grid.len() - 1]
.iter()
.enumerate()
.for_each(|(yidx, row)| {
row[1..row.len() - 1]
.iter()
.enumerate()
.for_each(|(xidx, tile)| {
if *tile == GridTile::Wall && cheatable(&grid, (xidx + 1, yidx + 1)) {
cheats.push((xidx + 1, yidx + 1));
}
});
});
let no_cheat = simulate_2(&grid, start);
let mut saved = HashMap::new();
for (tile_idx, tile) in no_cheat[..no_cheat.len() - time_to_saved]
.iter()
.enumerate()
{
for (cheat_idx, cheat) in no_cheat[tile_idx + time_to_saved..].iter().enumerate() {
let manhattan = tile.0.abs_diff(cheat.0) + tile.1.abs_diff(cheat.1);
if manhattan <= 2 {
let time_saved = (time_to_saved + cheat_idx).saturating_sub(2);
if time_saved != 0 {
saved
.entry(time_saved as u32)
.and_modify(|count| *count += 1)
.or_insert(1);
}
}
}
}
saved
}
fn simulate_2(grid: &[Vec<GridTile>], start: (usize, usize)) -> Vec<(usize, usize)> {
let mut visited = HashSet::new();
visited.insert(start);
let mut next_paths = vec![MazeRunner {
coords: start,
visited: visited.clone(),
..Default::default()
}];
let mut visited = Vec::new();
visited.push(start);
let mut arrived: Vec<MazeRunner> = Vec::new();
while !next_paths.is_empty() {
next_paths = next_paths
.iter()
.map(|maze_runner| {
let mut paths = Vec::new();
if let Some(path) = maze_runner.get_next(grid, Direction::Up) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(grid, Direction::Down) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(grid, Direction::Left) {
paths.push(path);
}
if let Some(path) = maze_runner.get_next(grid, Direction::Right) {
paths.push(path);
}
paths
})
.collect_vec()
.concat();
for (idx, maze_runner) in next_paths.clone().iter().enumerate().rev() {
if maze_runner.visited.contains(&maze_runner.coords)
|| visited.contains(&maze_runner.coords)
{
next_paths.remove(idx);
continue;
}
visited.push(maze_runner.coords);
next_paths[idx].visited.insert(maze_runner.coords);
if maze_runner.state == State::Arrived {
let arrived_reindeer = next_paths.remove(idx);
arrived.push(arrived_reindeer);
}
//log_maze(&grid, maze_runner);
}
}
visited
}
#[derive(Debug, Clone, PartialEq, Eq)]
enum Direction {
Up,
Down,
Left,
Right,
}
#[derive(Debug, Default, Clone, PartialEq, Eq)]
enum State {
#[default]
Going,
Arrived,
}
#[derive(Debug, Default, Clone, PartialEq, Eq)]
struct MazeRunner {
coords: (usize, usize),
visited: HashSet<(usize, usize)>,
state: State,
}
impl MazeRunner {
fn get_next(&self, grid: &[Vec<GridTile>], direction: Direction) -> Option<MazeRunner> {
let tile = match direction {
Direction::Up => grid[self.coords.1 - 1][self.coords.0],
Direction::Down => grid[self.coords.1 + 1][self.coords.0],
Direction::Right => grid[self.coords.1][self.coords.0 + 1],
Direction::Left => grid[self.coords.1][self.coords.0 - 1],
};
let coords = match direction {
Direction::Up => (self.coords.0, self.coords.1 - 1),
Direction::Down => (self.coords.0, self.coords.1 + 1),
Direction::Left => (self.coords.0 - 1, self.coords.1),
Direction::Right => (self.coords.0 + 1, self.coords.1),
};
if tile == GridTile::Wall {
None
} else if tile == GridTile::End {
Some(MazeRunner {
state: State::Arrived,
coords,
..self.clone()
})
} else {
Some(MazeRunner {
coords,
..self.clone()
})
}
}
}
#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq)]
enum GridTile {
Wall,
#[default]
Path,
Start,
End,
}
impl TryFrom<char> for GridTile {
type Error = Box<dyn Error>;
fn try_from(value: char) -> std::result::Result<GridTile, Box<dyn Error>> {
match value {
'#' => Ok(Self::Wall),
'.' => Ok(Self::Path),
'S' => Ok(Self::Start),
'E' => Ok(Self::End),
_ => Err(Box::from(format!("{value} is not a valid tile"))),
}
}
}
fn log_maze(grid: &[Vec<GridTile>], maze_runner: &MazeRunner) {
for (yidx, row) in grid.iter().enumerate() {
for (xidx, tile) in row.iter().enumerate() {
let contains = {
maze_runner.visited.contains(&(xidx, yidx))
|| maze_runner.visited.contains(&(xidx, yidx))
|| maze_runner.visited.contains(&(xidx, yidx))
|| maze_runner.visited.contains(&(xidx, yidx))
};
if contains && !(*tile == GridTile::Start || *tile == GridTile::End) {
print!("O");
} else if *tile == GridTile::Wall {
print!("#");
} else if *tile == GridTile::Path {
print!(".");
} else if *tile == GridTile::Start {
print!("S");
} else if *tile == GridTile::End {
print!("E");
}
}
println!();
}
}
#[cfg(test)]
mod tests {
use std::time::Instant;
use utils::time::get_elapsed_string;
use super::*;
const INPUT: &str = "###############
#...#...#.....#
#.#.#.#.#.###.#
#S#...#.#.#...#
#######.#.#.###
#######.#.#...#
#######.#.###.#
###..E#...#...#
###.#######.###
#...###...#...#
#.#####.#.###.#
#.#...#.#.#...#
#.#.#.#.#.#.###
#...#...#...###
###############";
#[test]
fn part1() {
let now = Instant::now();
println!("Test 1:");
let result = simulate_all(INPUT);
result
.iter()
.sorted_by(|a, b| a.0.cmp(b.0))
.for_each(|(saved, count)| {
println!("There are {count} cheats that saved {saved} picoseconds");
});
println!("Ran in {}", get_elapsed_string(now.elapsed()));
}
#[test]
fn part1_fast() {
let now = Instant::now();
println!("Test 2:");
let result = simulate_all_2(INPUT, 0);
result
.iter()
.sorted_by(|a, b| a.0.cmp(b.0))
.for_each(|(saved, count)| {
println!("There are {count} cheats that saved {saved} picoseconds");
});
println!("Ran in {}", get_elapsed_string(now.elapsed()));
}
#[test]
fn part2() {
let now = Instant::now();
println!("Test 2:");
let result = simulate_all_2(INPUT, 2);
result
.iter()
.sorted_by(|a, b| a.0.cmp(b.0))
.for_each(|(saved, count)| {
println!("There are {count} cheats that saved {saved} picoseconds");
});
println!("Ran in {}", get_elapsed_string(now.elapsed()));
}
}

2
y2024/src/days/mod.rs
View File

@ -27,3 +27,5 @@ pub mod d17;
pub mod d18; pub mod d18;
pub mod d19; pub mod d19;
pub mod d20;