kageru/advent-of-code
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wip day 23

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kageru 2023-12-25 19:01:16 +01:00
parent b7db7574fa
commit 3f31db2078
Signed by: kageru
GPG Key ID: 8282A2BEA4ADA3D2
3 changed files with 232 additions and 0 deletions
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#.#######.#.#.#.#####.###.#.###########.#.#.#.#.###.#.#.#.#v#.#.###.#.#.#.#.#.###.#.#v#.#.#.#.#####.#.###.#.#####.#.#####.###.#.#.#.###.#.#.#
#.#...#...#.#.#.#.....###.#.#...........#.#.#.#...#.#.#.#.>.>.#.#...#.#.#.#.#.#...#.>.>.#.#.#.#...#.#...#.#...#...#.#...#.#...#.#.#.#...#.#.#
#.#.#.#.###.#.#.#.#######.#.#.###########.#.#.###.#.#.#.#######.#.###.#.#.#.#.#.#########.#.#.#.#.#.###.#.###.#.###.#.#.#.#.###.#.#.#.###.#.#
#...#...###...#...#######...#.............#...###...#...#######...###...#...#...#########...#...#...###...###...###...#...#.....#...#.....#.#
###########################################################################################################################################.#

90
2023/src/bin/day23.rs Normal file
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@ -0,0 +1,90 @@
#![feature(test, try_blocks)]
extern crate test;
use aoc2023::{boilerplate, common::*};
use fnv::FnvHashSet as Set;
use std::mem::transmute;
#[repr(u8)]
#[allow(dead_code)]
#[derive(Debug)]
// Left and Up don’t actually appear in any outputs
enum Tile {
Empty = b'.',
Forest = b'#',
SlopeRight = b'>',
SlopeDown = b'v',
}
const DAY: usize = 23;
type Parsed<'a> = Vec<&'a [Tile]>;
type Pos = (usize, usize);
const START: Pos = (0, 1);
fn parse_input(raw: &str) -> Parsed {
raw.lines().map(|l| unsafe { transmute(l) }).collect()
}
fn step(parsed: &Parsed, visited: Set<Pos>, p: Pos, steps: usize) -> Option<usize> {
let candidates: Vec<Option<Pos>> = match parsed[p.1][p.0] {
Tile::SlopeDown => vec![Some((p.0, p.1 + 1))],
Tile::SlopeRight => vec![Some((p.0 + 1, p.1))],
_ => vec![try { (p.0.checked_sub(1)?, p.1) }, Some((p.0 + 1, p.1)), try { (p.0, p.1.checked_sub(1)?) }, Some((p.0, p.1 + 1))],
};
candidates
.into_iter()
.flatten()
.filter(|&(x, y)| !visited.contains(&(x, y)))
.filter_map(|(x, y)| match try { parsed.get(y)?.get(x)? } {
None => Some(steps + 1),
Some(Tile::Empty) => {
let mut visited = visited.clone();
visited.insert((x, y));
step(parsed, visited, (x, y), steps + 1)
}
_ => None,
})
.max()
}
fn part1(parsed: &Parsed) -> usize {
let end = (parsed.len() - 1, parsed[0].len() - 2);
step(parsed, Set::default(), START, 0).unwrap()
}
fn part2(parsed: &Parsed) -> usize {
unimplemented!()
}
boilerplate! {
TEST_INPUT == "\
#.#####################
#.......#########...###
#######.#########.#.###
###.....#.>.>.###.#.###
###v#####.#v#.###.#.###
###.>...#.#.#.....#...#
###v###.#.#.#########.#
###...#.#.#.......#...#
#####.#.#.#######.#.###
#.....#.#.#.......#...#
#.#####.#.#.#########v#
#.#...#...#...###...>.#
#.#.#v#######v###.###v#
#...#.>.#...>.>.#.###.#
#####v#.#.###v#.#.###.#
#.....#...#...#.#.#...#
#.#########.###.#.#.###
#...###...#...#...#.###
###.###.#.###v#####v###
#...#...#.#.>.>.#.>.###
#.###.###.#.###.#.#v###
#.....###...###...#...#
#####################.#"
for tests: {
part1: { TEST_INPUT => 94 },
part2: { TEST_INPUT => 0 },
},
bench1 == 0,
bench2 == 0,
bench_parse: Vec::len => 141,
}

1
2023/src/position.rs
View File

@ -8,6 +8,7 @@ use std::{
};
#[derive(Hash, PartialEq, Eq, Debug, Clone, Copy)]
#[repr(transparent)]
pub struct PositionND<I, const DIMS: usize>(pub [I; DIMS]);
pub type Position2D<I> = PositionND<I, 2>;