diff --git a/2018/benches/days.rs b/2018/benches/days.rs index 93d96d2..e594a74 100644 --- a/2018/benches/days.rs +++ b/2018/benches/days.rs @@ -71,8 +71,9 @@ day_bench!(day16, 16); day_bench!(day17, 17); day_bench!(day18, 18); day_bench!(day19, 19); +day_bench!(day20, 20); benchmark_main!(day01, day02, day03, day04, day05, day06, day07, day08, day09, day10, day11, day12, day13, day14, day15, - day16, day17, day18, day19); + day16, day17, day18, day19, day20); diff --git a/2018/inputs/20.txt b/2018/inputs/20.txt new file mode 100644 index 0000000..0b8780f --- /dev/null +++ b/2018/inputs/20.txt @@ -0,0 +1 @@ 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diff --git a/2018/loc.svg b/2018/loc.svg index 97c11fc..067d45f 100644 --- a/2018/loc.svg +++ b/2018/loc.svg @@ -32,10 +32,10 @@ z +" id="me1cf09a1d9" style="stroke:#000000;stroke-width:0.8;"/> - + @@ -71,7 +71,7 @@ z - + @@ -110,7 +110,7 @@ z - + @@ -139,7 +139,7 @@ z - + @@ -153,7 +153,7 @@ z - + @@ -193,7 +193,7 @@ z - + @@ -286,10 +286,10 @@ z +" id="m480ecff4e3" style="stroke:#000000;stroke-width:0.8;"/> - + @@ -302,7 +302,7 @@ L -3.5 0 - + @@ -316,7 +316,7 @@ L -3.5 0 - + @@ -331,7 +331,7 @@ L -3.5 0 - + @@ -346,7 +346,7 @@ L -3.5 0 - + @@ -361,7 +361,7 @@ L -3.5 0 - + @@ -577,7 +577,7 @@ z - - - + diff --git a/2018/src/day20.rs b/2018/src/day20.rs index 3fbf028..dda48b4 100644 --- a/2018/src/day20.rs +++ b/2018/src/day20.rs @@ -1,25 +1,187 @@ +use std::collections::HashMap; +use std::collections::VecDeque; use std::io::Read; use common::Solution; +type Coordinate = (i32, i32); + +#[derive(Copy, Clone)] +enum Direction { + North, + South, + West, + East, +} + +impl Direction { + pub fn walk(self, (x, y): Coordinate) -> Coordinate { + use self::Direction::*; + match self { + North => (x, y - 1), + West => (x - 1, y), + South => (x, y + 1), + East => (x + 1, y), + } + } +} + +impl From for Direction { + fn from(idx: usize) -> Self { + use self::Direction::*; + match idx { + 0 => North, + 1 => South, + 2 => West, + 3 => East, + val => panic!("Invalid direction: {}", val), + } + } +} + +impl From for Direction { + fn from(b: u8) -> Self { + use self::Direction::*; + match b { + b'N' => North, + b'S' => South, + b'W' => West, + b'E' => East, + val => panic!("Invalid direction: {}", val), + } + } +} + #[derive(Default)] -pub struct Day20 {} +pub struct Day20 { + paths: HashMap, +} impl Day20 { pub fn new() -> Self { Default::default() } + + fn follow_directions(&mut self, initial: &[Coordinate], data: &[u8]) -> (Vec, usize) { + let mut pos = Vec::from(initial); + let mut positions = Vec::new(); + + let mut index = 0; + + while index < data.len() { + let b = data[index]; + match b { + b'|' => { + positions.extend_from_slice(&pos); + pos = Vec::from(initial); + } + b'$' | b')' => { + positions.extend_from_slice(&pos); + positions.sort_unstable(); + positions.dedup(); + return (positions, index); + } + + b'(' => { + let (new_pos, read) = self.follow_directions(&pos, &data[index + 1..]); + pos = new_pos; + index += read + 1; + } + + b'N' | b'S' | b'W' | b'E' => { + let dir = Direction::from(b); + for p in pos.iter_mut() { + let entry = self.paths.entry(*p).or_insert([false; 4]); + entry[dir as usize] = true; + *p = dir.walk(*p); + } + } + val => panic!("Invalid input character: {}", val) + } + index += 1; + } + unreachable!(); + } + + fn distances(&self) -> HashMap { + let mut todo = VecDeque::new(); + let mut visited = HashMap::new(); + todo.push_back((0, (0, 0))); + visited.insert((0, 0), 0); + + while let Some((dist, pos)) = todo.pop_front() { + if let Some(dirs) = self.paths.get(&pos) { + let dirs = dirs.iter().enumerate() + .filter_map(|(idx, state)| if *state { + Some(Direction::from(idx)) + } else { + None + }); + for dir in dirs { + let new_pos = dir.walk(pos); + if !visited.contains_key(&new_pos) { + visited.insert(new_pos, dist + 1); + todo.push_back((dist + 1, new_pos)); + } + } + } + } + + visited + } } impl Solution for Day20 { - fn part1(&mut self, _input: &mut Read) -> String { - unimplemented!() + fn part1(&mut self, input: &mut Read) -> String { + let mut data = Vec::new(); + input.read_to_end(&mut data).unwrap(); + let pos = (0, 0); + + self.follow_directions(&[pos], &data[1..]); + format!("{}", self.distances().values().max().unwrap()) } - fn part2(&mut self, _input: &mut Read) -> String { - unimplemented!() + fn part2(&mut self, input: &mut Read) -> String { + let mut data = Vec::new(); + input.read_to_end(&mut data).unwrap(); + let pos = (0, 0); + + self.follow_directions(&[pos], &data[1..]); + format!("{}", self.distances().values().filter(|&&x| x >= 1000).count()) } } #[cfg(test)] -mod tests {} +mod tests { + use common::Solution; + + use super::*; + + #[test] + fn sane_enums() { + for idx in 0..4 { + let direction = Direction::from(idx); + let back = direction as usize; + assert_eq!(idx, back); + } + } + + #[test] + fn sample_part1() { + let samples: [&[u8]; 5] = [ + b"^WNE$", + b"^ENWWW(NEEE|SSE(EE|N))$", + b"^ENNWSWW(NEWS|)SSSEEN(WNSE|)EE(SWEN|)NNN$", + b"^ESSWWN(E|NNENN(EESS(WNSE|)SSS|WWWSSSSE(SW|NNNE)))$", + b"^WSSEESWWWNW(S|NENNEEEENN(ESSSSW(NWSW|SSEN)|WSWWN(E|WWS(E|SS))))$", + ]; + + let outputs = ["3", "10", "18", "23", "31"]; + + for (input, output) in samples.iter().zip(outputs.iter()) { + println!("{}", String::from_utf8_lossy(input)); + let mut instance = Day20::new(); + assert_eq!(*output, instance.part1(&mut input.as_ref())); + } + } +}