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day 12 done

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This commit is contained in:
Dylan Thies
2023-08-20 20:36:45 -04:00
parent f67fa4a3d4
commit 13d68eab9a
4 changed files with 284 additions and 0 deletions
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32
day12/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day12"
version = "0.1.0"
dependencies = [
"itertools",
"log",
]
[[package]]
name = "either"
version = "1.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
[[package]]
name = "itertools"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
dependencies = [
"either",
]
[[package]]
name = "log"
version = "0.4.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"

10
day12/Cargo.toml Normal file
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[package]
name = "day12"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
itertools = "0.11.0"
log = "0.4.20"

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day12/src/main.rs Normal file
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#![warn(clippy::all, clippy::pedantic)]
use std::{
collections::VecDeque,
fs::File,
io::{prelude::*, BufReader},
};
pub type BoxError = std::boxed::Box<
dyn std::error::Error // must implement Error to satisfy ?
+ std::marker::Send // needed for threads
+ std::marker::Sync, // needed for threads
>;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
struct Square {
pub height: u8,
pub pos: (usize, usize),
}
impl Square {
pub fn _index(&self, grid_size: &(usize, usize)) -> usize {
grid_size.1 * self.pos.0 + self.pos.1
}
pub fn can_go_to(&self, other: &Self) -> bool {
let from_height = self.height;
let to_height = other.height;
if from_height + 1 < to_height {
return false;
}
let (from_row, from_col) = self.pos;
let (to_row, to_col) = other.pos;
(from_row == to_row || from_col == to_col)
&& from_row + 1 >= to_row
&& from_row <= to_row + 1
&& from_col + 1 >= to_col
&& from_col <= to_col + 1
}
}
#[derive(Debug, Default, Clone)]
struct Game {
board: Vec<Square>,
distances: Vec<Option<u64>>,
board_size: (usize, usize),
start_pos: (usize, usize),
end_pos: (usize, usize),
}
impl From<File> for Game {
fn from(file: File) -> Self {
let buffer = BufReader::new(file);
let mut board = Vec::new();
let mut board_size = (0_usize, 0_usize);
let mut start_pos = (0_usize, 0_usize);
let mut end_pos = (0_usize, 0_usize);
for (row, line) in buffer
.lines()
.enumerate()
.map(|(row, col)| (row, col.unwrap()))
{
board_size.0 += 1;
board_size.1 = if board_size.1 == 0 {
line.len()
} else {
board_size.1
};
for (col, val) in line.as_bytes().iter().enumerate() {
let height = match val {
b'E' => {
end_pos = (row, col);
25
}
b'S' => {
start_pos = (row, col);
0
}
x => x - b'a',
};
board.push(Square {
pos: (row, col),
height,
});
}
}
let mut distances = std::iter::repeat(None)
.take(board.len())
.collect::<Vec<Option<u64>>>();
let index = board_size.1 * end_pos.0 + end_pos.1;
distances[index] = Some(0);
let mut game = Game {
board,
distances,
board_size,
start_pos,
end_pos,
};
game._set_distances();
game
}
}
impl Game {
fn pos_to_index(&self, pos: &(usize, usize)) -> usize {
self.board_size.1 * pos.0 + pos.1
}
fn _get_adjacent_from(&self, pos: &(usize, usize)) -> Vec<(usize, usize)> {
let mut vec = Vec::new();
let index = self.pos_to_index(pos);
if pos.0 != 0 {
let new_pos = (pos.0 - 1, pos.1);
let new_index = self.pos_to_index(&new_pos);
if self
.board
.get(new_index)
.unwrap()
.can_go_to(self.board.get(index).unwrap())
{
vec.push(new_pos);
}
}
if pos.0 + 1 < self.board_size.0 {
let new_pos = (pos.0 + 1, pos.1);
let new_index = self.pos_to_index(&new_pos);
if self.board[new_index].can_go_to(&self.board[index]) {
vec.push(new_pos);
}
}
if pos.1 != 0 {
let new_pos = (pos.0, pos.1 - 1);
let new_index = self.pos_to_index(&new_pos);
if self.board[new_index].can_go_to(&self.board[index]) {
vec.push(new_pos);
}
}
if pos.1 + 1 < self.board_size.1 {
let new_pos = (pos.0, pos.1 + 1);
let new_index = self.pos_to_index(&new_pos);
if self.board[new_index].can_go_to(&self.board[index]) {
vec.push(new_pos);
}
}
vec
}
fn _set_distances(&mut self) {
let mut queue = VecDeque::new();
queue.push_back(self.end_pos);
while let Some(cur_pos) = queue.pop_front() {
let adjacent = self._get_adjacent_from(&cur_pos);
let cur_index = self.pos_to_index(&cur_pos);
let cur_dist = self.distances.get(cur_index).unwrap().unwrap();
adjacent
.iter()
.filter(|pos| {
let index = self.pos_to_index(pos);
match self.distances.get(index).unwrap() {
None => {
self.distances[index] = Some(cur_dist + 1);
true
}
Some(check_dist) if *check_dist > cur_dist + 1 => {
self.distances[index] = Some(cur_dist + 1);
true
}
_ => false,
}
})
.for_each(|check_pos| {
queue.push_back(*check_pos);
});
}
}
pub fn get_distance_to_end(&self, pos: &(usize, usize)) -> Option<u64> {
*self.distances.get(self.pos_to_index(pos)).unwrap()
}
pub fn get_all_at_height(&self, height: u8) -> Vec<Square> {
self.board
.iter()
.filter(|x| x.height == height)
.copied()
.collect()
}
}
fn main() -> Result<(), BoxError> {
let file = File::open("./test.txt")?;
let game: Game = file.into();
let start = game.start_pos;
let s = game
.get_distance_to_end(&start)
.expect("No end to this game");
println!("Part 1: {s}");
let shortest = game
.get_all_at_height(0)
.iter()
.filter_map(|x| game.get_distance_to_end(&x.pos))
.min()
.expect("problem");
println!("Part 2: {shortest}");
Ok(())
}

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day12/test.txt Normal file
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abccccccccccccccccaaccccccccccccccccccccaaaaaaaaaaaaacccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaaa
abcccccccccccccaaaaaccccccccccccccccccccaaaaaaaaaaaaaccccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaa
abccccccccccccccaaaaaccccccccccccccaaaaacccaaaaaacccccaaccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaa
abccccccccccccccaaaaacccccccccaacccaaaaacccaaaaaaaccccaaaacaacaaccccccccccccccccccccccccaaaccccaaaccccccccccccaaaa
abcccccccccccccaaaaacccccccaaaaaccaaaaaacccaaaaaaaacaaaaaacaaaaaccccccccccccccccccccccccaaacccaaaaccccccccccccaaac
abccccccaacaaaccccaaccccccccaaaaacaaaaaaccaaaacaaaacaaaaaccaaaaaaccccccccccccccccccccccccaaaaaaaacccccccccccccaacc
abccccccaaaaaaccccccccccccccaaaaacaaaaaaccaaaaccaaaacaaaaacaaaaaacccccccccccccccccccccccaaaaaaaaaccccccccccccccccc
abccccccaaaaaacccccccccccccaaaaaccccaaccccaacccccaaccaacaacaaaaaccccccccccccccccccccccccccaaakkkkllllcccaaaccccccc
abccccccaaaaaaacccccccccccccccaaccccaacccccccccccccccccccccccaaaccccccaaaacccccccccjjjjkkkkkkkkkkllllccccaacaccccc
abcccccaaaaaaaacccccaaccccccccccccccaaaaaaccccccccccccccccccaaccccccccaaaaccccccccjjjjjkkkkkkkkkppllllcccaaaaacccc
abcccccaaaaaaaaccaaaacccccccccccccccaaaaaccccccccccccccccaacaaccccccccaaaacccccccjjjjjjjkkkkkppppppplllccaaaaacccc
abccccccccaaaccccaaaaaacccccccccccaaaaaaaccccccccccccccccaaaaacccccccccaacccccccjjjjoooooooppppppppplllcccaaaccccc
abccccccccaaccccccaaaaaccccaacccccaaaaaaaaccccaaacccccccccaaaaaaacccccccccccccccjjjooooooooppppuuppppllcccaaaccccc
abccccccaacccccccaaaaacccccaaaccaaaaaaaaaaccaaaaaaccccccaaaaaaaaaacaaaccccccccccjjjoooouuuoopuuuuupppllcccaaaccccc
abacccccaaccccccccccaacccccaaaaaaaccaaaaaaccaaaaaaccccccaaaaaccaaaaaaaccccaaccccjjoootuuuuuuuuuuuuvpqlllcccccccccc
abaccaaaaaaaacccccccccccccccaaaaaaccaacccccccaaaaacccccccacaaaccaaaaaaccaaaacaccjjooottuuuuuuuxyuvvqqljjccddcccccc
abcccaaaaaaaaccccccccccccaaaaaaaaacaacaaccccaaaaaccccccccccaaaaaaaaaacccaaaaaacciijootttxxxuuxyyyvvqqjjjjdddcccccc
abcccccaaaaccccaaacccccccaaaaaaaaacaaaaaccccaaaaaccccccccccccaaaaaaaaacccaaaaccciiinntttxxxxxxyyvvqqqqjjjddddccccc
abccccaaaaaccccaaaaacccccaaaaaaaaaaaaaaaaccccccccccccccccccccaaaaaaaaaaccaaaaccciiinntttxxxxxxyyvvvqqqqjjjdddccccc
abccccaaaaaaccaaaaaccccccccaaaaaaaaaaaaaacccccccccccccccccccccccaaacaaacaacaaccciiinnnttxxxxxyyyvvvvqqqqjjjdddcccc
SbccccaaccaaccaaaaacccccccccaaaaaaaaaaaaacccccccccccccccccccccccaaacccccccccccciiinnntttxxxEzzyyyyvvvqqqjjjdddcccc
abcccccccccccccaaaaacccccccaaaaaaaaacaaaccccccccccccccccccccccccaaccccccccccccciiinnnttxxxxyyyyyyyyvvvqqqjjjdddccc
abcccccccccccccaaccccccccccaaaaaaaaccccccccccccccccccccccccccccccccccccccccccciiinnntttxxyyyyyyyyyvvvvqqqjjjdddccc
abccccccccccccccccccccccccaaaaaaaacccccccccccccccccccccccccccccccccccccccccccciiinntttxxxwwwyyywwvvvvrqqjjjjdddccc
abcccccccccccccccccccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccciinnntttxwwwwwyyywwvvvrrrqkkkeddcccc
abcccccccccccccccccccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccchhnnntttsswwswwyywwrrrrrrkkkkeeecccc
abcccccccccccccccccccccccccccaaaaaacccccccccccccccccccaccccccccccccaaacccccccchhhnmmssssssswwwwwwrrrkkkkkeeeeecccc
abcccccccccccccccccccccccccccccaaacccccccccccccccccccaaccccccccccaaaaaacccccaahhhmmmmmsssssswwwwrrrkkkkkeeeeeccccc
abaacccccccccccccaccccccccccccccccccccccccccccccccaaaaacaacccccccaaaaaacaaaaaahhhhmmmmmmmmssswwwrrkkkkeeeeeacccccc
abacccccccccccccaaaaaaaaccccccccaaacccccccaaccccccaaaaaaaacccccccaaaaaacaaaaaaahhhhmmmmmmmmsssrrrrkkkeeeeeaacccccc
abaaaccccaaccccccaaaaaacccccccccaaacccaacaaaccccccccaaaacccccccccaaaaacccaaaaaaahhhhhhhmmmmlsssrrllkfeeeeaaaaacccc
abaaaccaaaaccccccaaaaaacccccccccaaaaaaaaaaaaaacccccaaaaacccccccccaaaaacccaaaaaaachhhhhgggmllsssrrllkffeaaaaaaacccc
abaacccaaaaaacccaaaaaaaacccccaaaaaaaaaaaaaaaaacccccaacaaacccccccccccccccaaaaaacccccchggggglllllllllfffaaaaaaaacccc
abaaccccaaaacccaaaaaaaaaaccccaaaaaaaaacaaaaaaaccaccaccaaacccccccccccccccaaaaaacccccccccgggglllllllffffaaaaaacccccc
abcccccaaaaacccaaaaaaaaaacccccaaaaaaaccaaaaacccaaaccccccccccccccccccccccccccaacccccccccagggglllllffffccccaaacccccc
abcccccaacaaccccccaaaaacaccaacccaaaaaaaaaaaaaccaaacccccccccccccccccccccccccccccccccccccaagggggffffffcccccccccccccc
abcccccccccccaaaaaaaaacccccaaccaaaaaaaccaaaaacaaaaccccccccccccccccccccccccccccccccccccaaaacgggfffffccccccccccccccc
abcccccccccccaaaaacaacccaaaaaaaaaaccaacccaaaaaaaacccaaccccccccccccccccccccccccccccccccccccccggfffccccccccccccaaaca
abccccccccccaaaaaaccccccaaaaaaaaacccccccccaaaaaaaaaaaacccccccccccccaaaccccccccccccccccccccccaaaccccccccccccccaaaaa
abccccccccccaaaaaaccccccccaaaacccccccccccccaaaaaaaaaaaaccccccccccccaaaaccccccccccccccccccccccaaaccccccccccccccaaaa
abcccccccccccaaaaacccccccaaaaaaccccccccccaaaaaaaaaaaaaaccccccccccccaaaaccccccccccccccccccccccccccccccccccccccaaaaa