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Day 21a
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lpenz committed Dec 21, 2023
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10 changes: 10 additions & 0 deletions Cargo.lock
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1 change: 1 addition & 0 deletions Cargo.toml
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Expand Up @@ -22,5 +22,6 @@ members = [
"day17",
"day18",
"day20",
"day21",
]

10 changes: 10 additions & 0 deletions day21/Cargo.toml
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[package]
name = "day21"
version = "0.1.0"
edition = "2021"

[dependencies]
aoc = { path = "../aoc" }
color-eyre = "0.6.2"
nom = "7.1.3"
sqrid = "0.0.23"
131 changes: 131 additions & 0 deletions day21/input.txt
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66 changes: 66 additions & 0 deletions day21/src/bin/day21a.rs
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// Copyright (C) 2023 Leandro Lisboa Penz <lpenz@lpenz.org>
// This file is subject to the terms and conditions defined in
// file 'LICENSE', which is part of this source code package.

use day21::*;

use std::collections::HashSet;

pub use sqrid::Dir;
pub type Sqrid = sqrid::sqrid_create!(131, 131, false);
// pub type Sqrid = sqrid::sqrid_create!(11, 11, false);
pub type Pos = sqrid::pos_create!(Sqrid);
pub type Grid = sqrid::grid_create!(Sqrid, Cell);

pub type GridDebug = sqrid::grid_create!(Sqrid, char);

pub type Steps = i32;

fn bfs(
size: u16,
grid: &Grid,
pos: Pos,
visited: &mut HashSet<(Pos, Steps)>,
end: &mut HashSet<Pos>,
stepsleft: i32,
) {
if visited.contains(&(pos, stepsleft)) {
return;
}
if stepsleft == 0 {
end.insert(pos);
return;
}
for dir in Dir::iter::<false>() {
let Ok(newpos) = pos + dir else { continue };
let newpos_t = newpos.tuple();
if newpos_t.0 >= size || newpos_t.1 >= size {
continue;
}
if grid[newpos] == Cell::Rock {
continue;
}
bfs(size, grid, newpos, visited, end, stepsleft - 1);
}
visited.insert((pos, stepsleft));
}

fn process(size: u16, steps: Steps, bufin: impl BufRead) -> Result<usize> {
let input = parser::parse(bufin)?;
let grid = Grid::try_from(input)?;
let start = Pos::iter().find(|p| grid[p] == Cell::Start).unwrap();
let mut visited = HashSet::<(Pos, Steps)>::new();
let mut end = HashSet::<Pos>::new();
bfs(size, &grid, start, &mut visited, &mut end, steps);
Ok(end.len())
}

#[test]
fn test() -> Result<()> {
assert_eq!(process(11, 6, EXAMPLE.as_bytes())?, 16);
Ok(())
}

fn main() -> Result<()> {
do_main(|| process(131, 64, stdin().lock()))
}
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