day 21: problem 1 solution
another unsatisfying one where i needed a visual hint to grok what i should be doing. a bunch of graph building stuff that wasn't needed for the part 1 solution at all.
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"indexmap",
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]
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"crossbeam-utils",
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]
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"windows_aarch64_gnullvm",
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"windows_aarch64_msvc",
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"windows_i686_gnu",
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"windows_i686_msvc",
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"windows_x86_64_gnu",
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"windows_x86_64_gnullvm",
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"windows_x86_64_msvc",
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[[package]]
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11
21/Cargo.toml
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[package]
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name = "day21"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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indicatif = "0.17.7"
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petgraph = "0.6.4"
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rayon = "1.8.0"
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131
21/input
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21/input
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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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|
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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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|
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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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|
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|
||||||
|
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|
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|
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|
||||||
|
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|
||||||
|
...................................................................................................................................
|
||||||
202
21/src/main.rs
Normal file
202
21/src/main.rs
Normal file
@ -0,0 +1,202 @@
|
|||||||
|
use core::panic;
|
||||||
|
use std::collections::HashSet;
|
||||||
|
use indicatif::{ProgressBar, ProgressStyle};
|
||||||
|
use petgraph::algo::k_shortest_path;
|
||||||
|
use petgraph::prelude::*;
|
||||||
|
use rayon::prelude::*;
|
||||||
|
use std::fs::File;
|
||||||
|
use std::io::{BufRead, BufReader, Lines};
|
||||||
|
use std::time::Instant;
|
||||||
|
|
||||||
|
// BOILERPLATE
|
||||||
|
type InputIter = Lines<BufReader<File>>;
|
||||||
|
|
||||||
|
fn get_input() -> InputIter {
|
||||||
|
let f = File::open("input").unwrap();
|
||||||
|
let br = BufReader::new(f);
|
||||||
|
br.lines()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let start = Instant::now();
|
||||||
|
let ans1 = problem1(get_input());
|
||||||
|
let duration = start.elapsed();
|
||||||
|
println!("Problem 1 solution: {} [{}s]", ans1, duration.as_secs_f64());
|
||||||
|
|
||||||
|
let start = Instant::now();
|
||||||
|
let ans2 = problem2(get_input());
|
||||||
|
let duration = start.elapsed();
|
||||||
|
println!("Problem 2 solution: {} [{}s]", ans2, duration.as_secs_f64());
|
||||||
|
}
|
||||||
|
|
||||||
|
// PARSE
|
||||||
|
|
||||||
|
type Position = (usize, usize);
|
||||||
|
type Offset = (isize, isize);
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
struct MapTile {
|
||||||
|
c: char,
|
||||||
|
idx: NodeIndex,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl MapTile {
|
||||||
|
fn new(c: char, idx: NodeIndex) -> Self {
|
||||||
|
Self { c, idx }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
type GraphType = DiGraph<char, ()>;
|
||||||
|
struct GardenMap {
|
||||||
|
map: Vec<Vec<MapTile>>,
|
||||||
|
graph: GraphType,
|
||||||
|
start: Position,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<T: BufRead> From<Lines<T>> for GardenMap {
|
||||||
|
fn from(lines: Lines<T>) -> Self {
|
||||||
|
let mut graph = DiGraph::new();
|
||||||
|
let map = lines
|
||||||
|
.map(|line| {
|
||||||
|
line.unwrap()
|
||||||
|
.chars()
|
||||||
|
.map(|c| MapTile::new(c, graph.add_node(c)))
|
||||||
|
.collect()
|
||||||
|
})
|
||||||
|
.collect();
|
||||||
|
let mut new = Self {
|
||||||
|
map,
|
||||||
|
start: (0, 0),
|
||||||
|
graph,
|
||||||
|
};
|
||||||
|
new.find_start();
|
||||||
|
new.build_graph();
|
||||||
|
new
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
const ADJACENCIES: [Offset; 4] = [(-1, 0), (1, 0), (0, -1), (0, 1)];
|
||||||
|
|
||||||
|
impl GardenMap {
|
||||||
|
fn width(&self) -> usize {
|
||||||
|
self.map[0].len()
|
||||||
|
}
|
||||||
|
fn height(&self) -> usize {
|
||||||
|
self.map.len()
|
||||||
|
}
|
||||||
|
fn at(&self, pos: &Position) -> &MapTile {
|
||||||
|
&self.map[pos.1][pos.0]
|
||||||
|
}
|
||||||
|
fn at_mut(&mut self, pos: &Position) -> &mut MapTile {
|
||||||
|
&mut self.map[pos.1][pos.0]
|
||||||
|
}
|
||||||
|
// return the valid 'moves' from pos
|
||||||
|
fn adjacent_to(&self, pos: &Position) -> Vec<Position> {
|
||||||
|
ADJACENCIES
|
||||||
|
.iter()
|
||||||
|
.filter_map(|ofs| self.offset_pos(pos, ofs))
|
||||||
|
.filter(|pos| self.at(pos).c == '.' || self.at(pos).c == 'S')
|
||||||
|
.collect()
|
||||||
|
}
|
||||||
|
fn offset_pos(&self, pos: &Position, ofs: &Offset) -> Option<Position> {
|
||||||
|
let new_pos = (pos.0 as isize + ofs.0, pos.1 as isize + ofs.1);
|
||||||
|
if new_pos.0 < 0 || new_pos.1 < 0 || new_pos.0 >= self.width() as isize || new_pos.1 >= self.height() as isize {
|
||||||
|
return None;
|
||||||
|
}
|
||||||
|
return Some((new_pos.0 as usize, new_pos.1 as usize));
|
||||||
|
}
|
||||||
|
fn find_start(&mut self) {
|
||||||
|
for (y, row) in self.map.iter().enumerate() {
|
||||||
|
for (x, tile) in row.iter().enumerate() {
|
||||||
|
if tile.c == 'S' {
|
||||||
|
self.start = (x, y);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
panic!("didn't find the start square!");
|
||||||
|
}
|
||||||
|
fn build_graph(&mut self) {
|
||||||
|
for y in 0..self.height() {
|
||||||
|
for x in 0..self.width() {
|
||||||
|
for (x2, y2) in self.adjacent_to(&(x, y)) {
|
||||||
|
self.graph.add_edge(self.at(&(x, y)).idx, self.at(&(x2, y2)).idx, ());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
fn reachable_after(&self, from: &Position, n: usize) -> HashSet<Position> {
|
||||||
|
let mut visited_after: Vec<HashSet<Position>> = Vec::new();
|
||||||
|
visited_after.push(HashSet::from([*from]));
|
||||||
|
for i in 1..n + 1 {
|
||||||
|
visited_after.push(
|
||||||
|
visited_after[i - 1]
|
||||||
|
.iter()
|
||||||
|
.flat_map(|last| self.adjacent_to(last))
|
||||||
|
.collect(),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
visited_after[n].clone()
|
||||||
|
}
|
||||||
|
fn reachable_count_after(&self, from: &Position, n: usize) -> u64 {
|
||||||
|
self.reachable_after(from, n).len() as u64
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn print_visited(map: &GardenMap, visited: &Vec<Vec<bool>>) {
|
||||||
|
for (y, row) in visited.iter().enumerate() {
|
||||||
|
for (x, cell) in row.iter().enumerate() {
|
||||||
|
print!("{}", if *cell { 'O' } else { map.at(&(x, y)).c });
|
||||||
|
}
|
||||||
|
println!();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// PROBLEM 1 solution
|
||||||
|
|
||||||
|
fn problem1_impl<T: BufRead>(input: Lines<T>, n: usize) -> u64 {
|
||||||
|
let map = GardenMap::from(input);
|
||||||
|
// println!("map: {:?} start: {:?}", map.map, &map.start);
|
||||||
|
|
||||||
|
map.reachable_count_after(&map.start, n)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
|
||||||
|
problem1_impl(input, 64)
|
||||||
|
}
|
||||||
|
|
||||||
|
// PROBLEM 2 solution
|
||||||
|
fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
|
||||||
|
0
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use crate::*;
|
||||||
|
use std::io::Cursor;
|
||||||
|
|
||||||
|
const EXAMPLE: &str = &"...........
|
||||||
|
.....###.#.
|
||||||
|
.###.##..#.
|
||||||
|
..#.#...#..
|
||||||
|
....#.#....
|
||||||
|
.##..S####.
|
||||||
|
.##..#...#.
|
||||||
|
.......##..
|
||||||
|
.##.#.####.
|
||||||
|
.##..##.##.
|
||||||
|
...........";
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn problem1_example() {
|
||||||
|
let c = Cursor::new(EXAMPLE);
|
||||||
|
assert_eq!(problem1_impl(c.lines(), 6), 16);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn problem2_example() {
|
||||||
|
let c = Cursor::new(EXAMPLE);
|
||||||
|
assert_eq!(problem2(c.lines()), 0);
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user