kamov/advent-of-code
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

2022 day 24 rust

Browse source
This commit is contained in:
Maciej Jur 2022-12-24 12:03:10 +01:00
parent b6bb78439c
commit 19fb611438
1 changed files with 0 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
2022/rust/src/solutions/day24.rs
View file

@ -67,7 +67,6 @@ fn manhattan(start: Pos, goal: Pos) -> isize {
fn a_star(start: Pos, goal: Pos, dims: (isize, isize), blizzards: &[Blizzard], offset: isize) -> Option<isize> {
let mut frontier: BinaryHeap<State> = BinaryHeap::new();
let mut parent: HashMap<(isize, Pos), (isize, Pos)> = HashMap::new();
let mut cost: HashMap<(isize, Pos), isize> = HashMap::from([((offset, start), 0)]);
frontier.push(State { cost: 0, position: (offset, start) });
@ -75,12 +74,10 @@ fn a_star(start: Pos, goal: Pos, dims: (isize, isize), blizzards: &[Blizzard], o
if cur_pos == goal { return Some(cur_t) };
let next_t = cur_t + 1;
let blizzards = offset_blizzards(blizzards, dims, next_t);
for neighbour in neighbours(cur_pos, dims).filter(|p| !blizzards.contains(p)) {
let new_cost = cost.get(&(cur_t, cur_pos)).unwrap() + 1;
if !cost.contains_key(&(next_t, neighbour)) || new_cost < cost[&(next_t, neighbour)] {
cost.insert((next_t, neighbour), new_cost);
parent.insert((next_t, neighbour), (cur_t, cur_pos));
frontier.push(State {
cost: new_cost + manhattan(neighbour, goal),
position: (next_t, neighbour),