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+############################################################################################################################################# diff --git a/src/bin/16.rs b/src/bin/16.rs new file mode 100644 index 0000000..5f99d13 --- /dev/null +++ b/src/bin/16.rs @@ -0,0 +1,136 @@ +use std::{ + cmp::Reverse, + collections::{hash_map::Entry, BinaryHeap, HashMap, HashSet}, +}; + +static DIRECTIONS: [(isize, isize); 4] = [(0, -1), (1, 0), (0, 1), (-1, 0)]; + +fn walk_paths( + visited: &Visited, + x: usize, + y: usize, + dir: usize, + tiles: &mut HashSet<(usize, usize)>, +) { + if let Some((_, v)) = visited.get(&(x, y, dir)) { + for &(nx, ny, ndir) in v { + tiles.insert((nx, ny)); + + walk_paths(visited, nx, ny, ndir, tiles); + } + } +} + +type Visited = HashMap<(usize, usize, usize), (i32, HashSet<(usize, usize, usize)>)>; + +fn main() { + let text = std::fs::read_to_string("input/16-1.in").unwrap(); + + let mut startx = 0; + let mut starty = 0; + let start_dir = 1; + let mut endx = 0; + let mut endy = 0; + + let map = text + .lines() + .enumerate() + .map(|(y, l)| { + l.chars() + .enumerate() + .map(move |(x, c)| (x, y, c)) + .map(|(x, y, c)| match c { + '#' => false, + '.' => true, + 'S' => { + startx = x; + starty = y; + true + } + 'E' => { + endx = x; + endy = y; + true + } + _ => unreachable!(), + }) + .collect::>() + }) + .collect::>(); + + let mut queue = BinaryHeap::new(); + let mut visited = HashSet::new(); + + queue.push(Reverse((0, startx, starty, start_dir))); + + let mut final_score = 0; + while let Some(Reverse((score, x, y, dir))) = queue.pop() { + if x == endx && y == endy { + final_score = score; + break; + } + + if visited.insert((x, y, dir)) { + let (dx, dy) = DIRECTIONS[dir]; + let nextx = x.checked_add_signed(dx).unwrap(); + let nexty = y.checked_add_signed(dy).unwrap(); + if map[nexty][nextx] { + queue.push(Reverse((score + 1, nextx, nexty, dir))); + } + + queue.push(Reverse((score + 1000, x, y, (dir + 1) % 4))); + queue.push(Reverse((score + 1000, x, y, (dir + 3) % 4))); + } + } + + println!("{final_score}"); + + let mut queue = BinaryHeap::new(); + let mut visited: Visited = HashMap::new(); + + queue.push(Reverse((0, (startx, starty, start_dir), (0, 0, 0)))); + + while let Some(Reverse((score, pos, from))) = queue.pop() { + match visited.entry(pos) { + Entry::Occupied(mut occupied_entry) => { + if score > occupied_entry.get().0 { + continue; + } else { + occupied_entry.get_mut().1.insert(from); + } + } + Entry::Vacant(vacant_entry) => { + vacant_entry.insert((score, HashSet::from([from]))); + } + }; + // if visited.insert((x, y, dir)) { + let (x, y, dir) = pos; + let (dx, dy) = DIRECTIONS[dir]; + let nextx = x.checked_add_signed(dx).unwrap(); + let nexty = y.checked_add_signed(dy).unwrap(); + if map[nexty][nextx] { + queue.push(Reverse((score + 1, (nextx, nexty, dir), pos))); + } + + queue.push(Reverse((score + 1000, (x, y, (dir + 1) % 4), pos))); + queue.push(Reverse((score + 1000, (x, y, (dir + 3) % 4), pos))); + // } + } + + let mut tiles = HashSet::new(); + + if visited.get(&(endx, endy, 0)).unwrap().0 == final_score { + walk_paths(&visited, endx, endy, 0, &mut tiles); + } + if visited.get(&(endx, endy, 1)).unwrap().0 == final_score { + walk_paths(&visited, endx, endy, 1, &mut tiles); + } + if visited.get(&(endx, endy, 2)).unwrap().0 == final_score { + walk_paths(&visited, endx, endy, 2, &mut tiles); + } + if visited.get(&(endx, endy, 3)).unwrap().0 == final_score { + walk_paths(&visited, endx, endy, 3, &mut tiles); + } + + println!("{}", tiles.len()); +}