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Bert Peters
2022-01-02 18:30:13 +01:00
parent 894524bc81
commit 601de2c565
1 changed files with 9 additions and 5 deletions
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14
2021/src/day23.rs
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@@ -29,6 +29,10 @@ impl Pod {
Pod::D => 1000,
}
}
pub fn dest(self) -> usize {
self as usize
}
}
impl TryFrom<char> for Pod {
@@ -129,7 +133,7 @@ impl<const S: usize> State<S> {
.filter_map(|(pos, &pod)| {
let pod = pod?;
let destination_pos = room_hallway_pos(pod as usize);
let destination_pos = room_hallway_pos(pod.dest());
Some(abs_delta(pos, destination_pos) as u32 * pod.cost())
})
@@ -147,12 +151,12 @@ impl<const S: usize> State<S> {
.enumerate()
.rev()
.skip_while(|&(_, &entry)| {
entry.map(|pod| pod as usize == room_index).unwrap_or(false)
entry.map(|pod| pod.dest() == room_index).unwrap_or(false)
})
.filter_map(|(room_pos, &pod)| {
let pod = pod?;
let destination_pos = room_hallway_pos(pod as usize);
let destination_pos = room_hallway_pos(pod.dest());
let steps = 1 + room_pos + abs_delta(hallway_pos, destination_pos).max(2);
@@ -175,7 +179,7 @@ impl<const S: usize> State<S> {
// Check if we even want to move anything out of this room
if room
.iter()
.all(|entry| entry.map(|pod| pod as usize == index).unwrap_or(true))
.all(|entry| entry.map(|pod| pod.dest() == index).unwrap_or(true))
{
continue;
}
@@ -240,7 +244,7 @@ impl<const S: usize> State<S> {
.enumerate()
.filter_map(|(pos, pod)| pod.map(|pod| (pos, pod)))
{
let room = pod as usize;
let room = pod.dest();
let new_hallway_pos = room_hallway_pos(room);
// Check if the path is free