From 349ec2174dc890a5b7a8d47b5ca5d8c83fea1ec6 Mon Sep 17 00:00:00 2001 From: Jesse Luehrs Date: Mon, 12 Dec 2022 00:50:30 -0500 Subject: day 12 --- data/2022/12.txt | 41 ++++++++++++++++++++++++++ src/bin/2021/day25.rs | 2 +- src/bin/2022/day12.rs | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++ src/bin/2022/main.rs | 2 ++ src/parse.rs | 10 ++++--- 5 files changed, 132 insertions(+), 5 deletions(-) create mode 100644 data/2022/12.txt create mode 100644 src/bin/2022/day12.rs diff --git a/data/2022/12.txt b/data/2022/12.txt new file mode 100644 index 0000000..af66594 --- /dev/null +++ b/data/2022/12.txt @@ -0,0 +1,41 @@ +abaaaaaaaaccccccccccccccccccaaaaaccccaaaaaaccccccccccccccccccccccaaaaaaaaaacccccccccccccccccccccccccccccccaaaaaccccccccccccccccccccccccccccccccccccccccccaaaaaa +abaaaaaaaacccccccccccccccccccaaaaaccccaaaacccccaaaacccccccccccccccaaaaaaaaaacccccccccccccccccccccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccccaaaa 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b/src/bin/2022/day12.rs @@ -0,0 +1,82 @@ +#![allow(dead_code)] +#![allow(unused_variables)] + +use advent_of_code::prelude::*; + +pub struct Map { + grid: Grid, + start: (Row, Col), + end: (Row, Col), +} + +impl advent_of_code::graph::Graph<(Row, Col), (Row, Col)> for Map { + type Edges = advent_of_code::grid::Adjacent; + + fn edges(&self, v: (Row, Col)) -> Self::Edges { + self.grid.adjacent(v.0, v.1, false) + } + + fn edge(&self, v: (Row, Col), e: (Row, Col)) -> ((Row, Col), u64) { + ( + e, + if self.grid[e.0][e.1] <= self.grid[v.0][v.1] + 1 { + 1 + } else { + 999_999_999 + }, + ) + } +} + +pub fn parse(fh: File) -> Result { + let mut start = None; + let mut end = None; + let grid = parse::grid(parse::raw_lines(fh), |c, row, col| match c { + b'a'..=b'z' => c - b'a', + b'S' => { + start = Some((row, col)); + 0 + } + b'E' => { + end = Some((row, col)); + b'z' - b'a' + } + _ => panic!("unknown map char '{c}'"), + }); + Ok(Map { + grid, + start: start.expect("start not found"), + end: end.expect("end not found"), + }) +} + +pub fn part1(map: Map) -> Result { + Ok(map.dijkstra(map.start, map.end).0) +} + +pub fn part2(map: Map) -> Result { + Ok(map + .grid + .indexed_cells() + .filter_map(|(pos, height)| { + if *height == 0 { + Some(map.dijkstra(pos, map.end).0) + } else { + None + } + }) + .min() + .unwrap()) +} + +#[test] +fn test() { + assert_eq!( + part1(parse(parse::data(2022, 12).unwrap()).unwrap()).unwrap(), + 504 + ); + assert_eq!( + part2(parse(parse::data(2022, 12).unwrap()).unwrap()).unwrap(), + 500 + ); +} diff --git a/src/bin/2022/main.rs b/src/bin/2022/main.rs index 09a9248..c694d56 100644 --- a/src/bin/2022/main.rs +++ b/src/bin/2022/main.rs @@ -22,6 +22,7 @@ mod day6; mod day7; mod day8; mod day9; +mod day12; // NEXT MOD #[paw::main] @@ -39,6 +40,7 @@ fn main(opt: Opt) -> Result<()> { 9 => advent_of_code::day!(2022, opt.day, opt.puzzle, day9), 10 => advent_of_code::day!(2022, opt.day, opt.puzzle, day10), 11 => advent_of_code::day!(2022, opt.day, opt.puzzle, day11), + 12 => advent_of_code::day!(2022, opt.day, opt.puzzle, day12), // NEXT PART _ => panic!("unknown day {}", opt.day), } diff --git a/src/parse.rs b/src/parse.rs index 7e6cab7..1219484 100644 --- a/src/parse.rs +++ b/src/parse.rs @@ -106,17 +106,19 @@ pub fn digit_grid(lines: impl Iterator) -> Grid { // false positive, doing its suggestion gives borrow checker errors #[allow(clippy::redundant_closure)] -pub fn grid(lines: impl Iterator, f: F) -> Grid +pub fn grid(lines: impl Iterator, mut f: F) -> Grid where - F: Fn(u8) -> T, + F: FnMut(u8, Row, Col) -> T, T: Clone + Default + Eq + PartialEq, { lines - .map(|s| { + .enumerate() + .map(|(row, s)| { s.as_bytes() .iter() .copied() - .map(|b| f(b)) + .enumerate() + .map(|(col, b)| f(b, Row(row), Col(col))) .collect::>() }) .collect() -- cgit v1.2.3-54-g00ecf