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0c5498df01
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bebd52fcd1
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|
||||||
112132355244213155233442235466434765766475536356756684465575864445764858786785447447456546876757643366356365533325522463622314154332523412222
|
|
||||||
142114432255353453443333242364454445455667565746775338455775466464446566858545476774748684744466355663347557725225254556442215332133253233113
|
|
||||||
324232222353554311553264345636223425446373753365633364466564568868468884445465874857688447555536455333533655225643634443235332351244433213223
|
|
||||||
321433314313354144232435524663626536674567763664547375777767588455666548645778654885544464643677477434474675433526362636332114334554441324114
|
|
||||||
444321112222334134433263345652652235534675767667776437555467577585866545875486664634566453575434737677576733446345256355453543353114412143334
|
|
||||||
334213333552335224223433264463565555325776453574746463574563756633564685485754464533647434737337665734565563342354236662235252132554241324333
|
|
||||||
144242213332514333152434432345554565264335637367775737335764737743676544744566376673745757745533364645453343235662625363513324113323243414331
|
|
||||||
421244234231131113244435543362364532632556547634376347443334636346766373467547446657376566637376376645435656232353325235532515111344441122314
|
|
||||||
432221443343421433442334254443544645225462444464345667466447446353676465637574566575435537655465434753443533653564366253512344224523214124314
|
|
||||||
442411214142453325332355511645664334543632657346365355435344476755567436477367546447744546663575533256334363365442622254523125255351333344334
|
|
||||||
232133113432234544554352242455426224355326625375457436577634474767555535546577656356574566466534733366642242352545631325212142555234442344213
|
|
||||||
134134243443235545413345331544664326536456355323773465564766375643547643734465565567755646666354425566664226646443325232215421344113231433424
|
|
||||||
311414212223243435443253441523422532533546652343233366467353367456765344677664436355635646542236522344226542526521331313325355112414212322421
|
|
||||||
334232443321214421211245451135156243663543242242266643734575556667574545756556643547337554242352425255443425263343355243143343221241214234343
|
|
||||||
124232141423143444334521514545324434424355644463624363327734476336434633435673465446464366334525462434632323446441521144323114143113241321322
|
|
||||||
321414331231141234351213225534114256365433422465655242455623675653343654456737676334562333232443533433345336621513331511453141434223121224422
|
|
||||||
233213212123332231444321554454521243352252556656534523664223224626544456453443223453642526535524426434322325222151553122432424133221432123312
|
|
||||||
132321423141322311111455511235131324533532253633455555424625245553424542362565522535443266232235665253526451221523231511534143214332442333423
|
|
||||||
231123343344444323131332211451353122524546266666363455365654343226336355324563455436265544334662333235265255142321144434543434214242441243332
|
|
||||||
111133423112214421432525544554514441143234656452524644342365355552246535242244443255664242362635265463654225515333115335451431434232224433122
|
|
||||||
233313113331334443314144235232155111242434354636364324664646444542553565524232453555263445434425533333113315152345245133213224312324131222222
|
|
||||||
122331314221321232244311154432354132551355214343635355633243553456534342552562224252264552632654646142443252452232455541422134411424133323213
|
|
||||||
321323232214143324412144152353142253333434221326622552645434535562666444426333326456265552323653322335233241235433141534442344442412141323122
|
|
||||||
333322211144143144413124114531254255313451244544546656322543634262532645655655636632423532352254234545251152154535241311224344244322132331111
|
|
||||||
233223131323341323132343132144124232445141442155112456324443652622633353344463432453352632231125552213124122311155413441434142413111222332332
|
|
||||||
323223212113232314444441311112512135441525235234551145264266223553444526342234456245465642135234421551443551533543133123214241222432213223122
|
|
||||||
311312332231134342414324333243224514535534312111323131434542623323632346523323446362131122522334552125245251413132113224314134423411111333331
|
|
||||||
331232112322123214133424214211315152511525535444441112554314211212133344544334245121341153154552255531251335211131123331322121233121311111123
|
|
||||||
112222313331221111442434111223431425412314322343135331535353312535342545315342221553551233455324225352231511444332413214443431341333321333323
|
|
||||||
113322121232321311434444342111232434555234332411453131314453234552423312521155444131243522241333531125233313122342413211344414121221321132123
|
|
||||||
231132131331212231143441111443414113444433535543534441452415315435355153145243235542533153124432435253444243321324133241144422333223322331123
|
|
||||||
122332113112121213234112443231334411112234351253542213533414315524215133522524342325151543155414215411524114144443322341233311111323322333113
|
|
||||||
450
src/day17.rs
450
src/day17.rs
|
|
@ -1,450 +0,0 @@
|
||||||
use std::{
|
|
||||||
collections::{BinaryHeap, HashMap},
|
|
||||||
fmt::Debug,
|
|
||||||
fs::DirEntry,
|
|
||||||
};
|
|
||||||
|
|
||||||
use itertools::Itertools;
|
|
||||||
|
|
||||||
pub fn run() {
|
|
||||||
let input = include_str!("../input/day17.txt");
|
|
||||||
let map: Map = input.into();
|
|
||||||
|
|
||||||
let path = map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part1_edges,
|
|
||||||
);
|
|
||||||
dbg!(map.path_cost(&path.unwrap()));
|
|
||||||
|
|
||||||
let path2 = map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part2_edges,
|
|
||||||
);
|
|
||||||
dbg!(map.part2_path_cost(&path2.unwrap()));
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Clone)]
|
|
||||||
struct Map {
|
|
||||||
costs: Vec<Vec<u8>>,
|
|
||||||
width: usize,
|
|
||||||
height: usize,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl From<&str> for Map {
|
|
||||||
fn from(value: &str) -> Self {
|
|
||||||
let costs = value
|
|
||||||
.trim()
|
|
||||||
.lines()
|
|
||||||
.map(|l| {
|
|
||||||
l.trim()
|
|
||||||
.chars()
|
|
||||||
.map(|c| c.to_digit(10).unwrap() as u8)
|
|
||||||
.collect::<Vec<_>>()
|
|
||||||
})
|
|
||||||
.collect::<Vec<_>>();
|
|
||||||
let width = costs[0].len();
|
|
||||||
let height = costs.len();
|
|
||||||
Self {
|
|
||||||
costs,
|
|
||||||
width,
|
|
||||||
height,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Debug for Map {
|
|
||||||
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
|
||||||
write!(f, "Map(\n")?;
|
|
||||||
for row in self.costs.iter() {
|
|
||||||
for cost in row {
|
|
||||||
write!(f, "{}", cost)?;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
write!(f, ")")
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
|
||||||
enum Direction {
|
|
||||||
Up,
|
|
||||||
Down,
|
|
||||||
Left,
|
|
||||||
Right,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Direction {
|
|
||||||
fn all() -> [Direction; 4] {
|
|
||||||
[
|
|
||||||
Direction::Up,
|
|
||||||
Direction::Down,
|
|
||||||
Direction::Left,
|
|
||||||
Direction::Right,
|
|
||||||
]
|
|
||||||
}
|
|
||||||
|
|
||||||
fn move_pos(&self, pos: (isize, isize)) -> (isize, isize) {
|
|
||||||
self.move_pos_count(pos, 1)
|
|
||||||
}
|
|
||||||
|
|
||||||
fn move_pos_count(&self, (col, row): (isize, isize), count: isize) -> (isize, isize) {
|
|
||||||
match self {
|
|
||||||
Direction::Up => (col, row - count),
|
|
||||||
Direction::Down => (col, row + count),
|
|
||||||
Direction::Left => (col - count, row),
|
|
||||||
Direction::Right => (col + count, row),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
fn opposite(&self) -> Self {
|
|
||||||
match self {
|
|
||||||
Direction::Up => Direction::Down,
|
|
||||||
Direction::Down => Direction::Up,
|
|
||||||
Direction::Left => Direction::Right,
|
|
||||||
Direction::Right => Direction::Left,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug, Clone, Copy)]
|
|
||||||
struct Edge {
|
|
||||||
direction: Direction,
|
|
||||||
dest: (isize, isize),
|
|
||||||
cost: u8,
|
|
||||||
steps: usize,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Map {
|
|
||||||
fn in_bounds(&self, (col, row): (isize, isize)) -> bool {
|
|
||||||
col >= 0 && col < self.width as isize && row >= 0 && row < self.height as isize
|
|
||||||
}
|
|
||||||
|
|
||||||
fn part1_edges(
|
|
||||||
&self,
|
|
||||||
pos: (isize, isize),
|
|
||||||
incoming_dir: Option<(Direction, usize)>,
|
|
||||||
) -> Vec<Edge> {
|
|
||||||
Direction::all()
|
|
||||||
.iter()
|
|
||||||
.filter_map(|&d| {
|
|
||||||
if incoming_dir.is_some_and(|(x, c)| x == d.opposite() || (x == d && c >= 3)) {
|
|
||||||
return None;
|
|
||||||
}
|
|
||||||
let moved = d.move_pos(pos);
|
|
||||||
if !self.in_bounds(moved) {
|
|
||||||
return None;
|
|
||||||
}
|
|
||||||
Some(Edge {
|
|
||||||
direction: d,
|
|
||||||
dest: moved,
|
|
||||||
cost: self.costs[moved.1 as usize][moved.0 as usize],
|
|
||||||
steps: 1,
|
|
||||||
})
|
|
||||||
})
|
|
||||||
.collect()
|
|
||||||
}
|
|
||||||
|
|
||||||
fn part2_edges(
|
|
||||||
&self,
|
|
||||||
pos: (isize, isize),
|
|
||||||
incoming_dir: Option<(Direction, usize)>,
|
|
||||||
) -> Vec<Edge> {
|
|
||||||
let mut v = vec![];
|
|
||||||
for d in Direction::all() {
|
|
||||||
if incoming_dir.is_some_and(|(x, _)| x == d.opposite()) {
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
for dist in 4..=10 {
|
|
||||||
if incoming_dir.is_some_and(|(x, c)| x == d && (c + dist) > 10) {
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
|
|
||||||
let moved = d.move_pos_count(pos, dist as isize);
|
|
||||||
if !self.in_bounds(moved) {
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
|
|
||||||
let costs_sum = (1..=dist)
|
|
||||||
.map(|c| {
|
|
||||||
let moved = d.move_pos_count(pos, c as isize);
|
|
||||||
self.costs[moved.1 as usize][moved.0 as usize]
|
|
||||||
})
|
|
||||||
.sum();
|
|
||||||
v.push(Edge {
|
|
||||||
direction: d,
|
|
||||||
dest: moved,
|
|
||||||
cost: costs_sum,
|
|
||||||
steps: dist,
|
|
||||||
});
|
|
||||||
}
|
|
||||||
}
|
|
||||||
v
|
|
||||||
}
|
|
||||||
|
|
||||||
fn dijkstra_ish(
|
|
||||||
&self,
|
|
||||||
start: (isize, isize),
|
|
||||||
end: (isize, isize),
|
|
||||||
edges_fn: impl Fn(&Self, (isize, isize), Option<(Direction, usize)>) -> Vec<Edge>,
|
|
||||||
) -> Option<Vec<(isize, isize)>> {
|
|
||||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
||||||
struct QueueEntry {
|
|
||||||
neg_cost: isize,
|
|
||||||
inbound: Option<(Direction, usize)>,
|
|
||||||
pos: (isize, isize),
|
|
||||||
}
|
|
||||||
impl Ord for QueueEntry {
|
|
||||||
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
|
|
||||||
self.neg_cost.cmp(&other.neg_cost)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
impl PartialOrd for QueueEntry {
|
|
||||||
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
|
|
||||||
Some(self.cmp(other))
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
let mut queue = BinaryHeap::<QueueEntry>::new();
|
|
||||||
|
|
||||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
|
||||||
struct HistoryKey {
|
|
||||||
pos: (isize, isize),
|
|
||||||
inbound: Option<(Direction, usize)>,
|
|
||||||
}
|
|
||||||
|
|
||||||
let mut distances = HashMap::<HistoryKey, usize>::new();
|
|
||||||
let mut prev = HashMap::<HistoryKey, HistoryKey>::new();
|
|
||||||
|
|
||||||
distances.insert(
|
|
||||||
HistoryKey {
|
|
||||||
pos: start,
|
|
||||||
inbound: None,
|
|
||||||
},
|
|
||||||
0,
|
|
||||||
);
|
|
||||||
queue.push(QueueEntry {
|
|
||||||
neg_cost: 0,
|
|
||||||
inbound: None,
|
|
||||||
pos: start,
|
|
||||||
});
|
|
||||||
|
|
||||||
while let Some(entry) = queue.pop() {
|
|
||||||
let entry_key = HistoryKey {
|
|
||||||
pos: entry.pos,
|
|
||||||
inbound: entry.inbound,
|
|
||||||
};
|
|
||||||
for edge in edges_fn(self, entry.pos, entry.inbound) {
|
|
||||||
let alt = distances.get(&entry_key).unwrap_or(&usize::MAX) + edge.cost as usize;
|
|
||||||
let new_inbound_dir_count = if let Some((d, c)) = entry.inbound {
|
|
||||||
if d == edge.direction {
|
|
||||||
c + edge.steps
|
|
||||||
} else {
|
|
||||||
edge.steps
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
edge.steps
|
|
||||||
};
|
|
||||||
let edge_key = HistoryKey {
|
|
||||||
pos: edge.dest,
|
|
||||||
inbound: Some((edge.direction, new_inbound_dir_count)),
|
|
||||||
};
|
|
||||||
if alt < *distances.get(&edge_key).unwrap_or(&usize::MAX) {
|
|
||||||
distances.insert(edge_key, alt);
|
|
||||||
prev.insert(edge_key, entry_key);
|
|
||||||
let new_entry = QueueEntry {
|
|
||||||
neg_cost: -(alt as isize),
|
|
||||||
inbound: Some((edge.direction, new_inbound_dir_count)),
|
|
||||||
pos: edge.dest,
|
|
||||||
};
|
|
||||||
queue.push(new_entry);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// for row in 0..self.height {
|
|
||||||
// for col in 0..self.width {
|
|
||||||
// println!("({}, {}) ", col, row);
|
|
||||||
// for d in Direction::all() {
|
|
||||||
// println!(
|
|
||||||
// "\t{:?} 0={}/{:?}, 1={}/{:?}, 2={}/{:?}, 3={}/{:?}",
|
|
||||||
// d,
|
|
||||||
// distances[row][col][d as usize][0],
|
|
||||||
// prev[row][col][d as usize][0],
|
|
||||||
// distances[row][col][d as usize][1],
|
|
||||||
// prev[row][col][d as usize][1],
|
|
||||||
// distances[row][col][d as usize][2],
|
|
||||||
// prev[row][col][d as usize][2],
|
|
||||||
// distances[row][col][d as usize][3],
|
|
||||||
// prev[row][col][d as usize][3],
|
|
||||||
// );
|
|
||||||
// }
|
|
||||||
// }
|
|
||||||
// }
|
|
||||||
|
|
||||||
let mut path = vec![];
|
|
||||||
let min = distances
|
|
||||||
.iter()
|
|
||||||
.filter(|(k, _)| k.pos == end)
|
|
||||||
.min_by_key(|(_, d)| **d)
|
|
||||||
.unwrap()
|
|
||||||
.0;
|
|
||||||
let mut u = Some(min);
|
|
||||||
while let Some(key) = u {
|
|
||||||
println!("({}, {})", key.pos.0, key.pos.1);
|
|
||||||
path.insert(0, key.pos);
|
|
||||||
u = prev.get(key);
|
|
||||||
}
|
|
||||||
Some(path)
|
|
||||||
}
|
|
||||||
|
|
||||||
fn path_cost(&self, path: &[(isize, isize)]) -> usize {
|
|
||||||
path.iter()
|
|
||||||
.skip(1)
|
|
||||||
.map(|&(col, row)| self.costs[row as usize][col as usize] as usize)
|
|
||||||
.sum()
|
|
||||||
}
|
|
||||||
|
|
||||||
fn part2_path_cost(&self, path: &[(isize, isize)]) -> usize {
|
|
||||||
let mut cost = 0;
|
|
||||||
for (a, b) in path.iter().zip(path.iter().skip(1)) {
|
|
||||||
// a->b is always a cardinal direction, so one of these loops will only have one
|
|
||||||
// iteration
|
|
||||||
for row in a.1.min(b.1)..=a.1.max(b.1) {
|
|
||||||
for col in a.0.min(b.0)..=a.0.max(b.0) {
|
|
||||||
cost += self.costs[row as usize][col as usize] as usize;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// don't double count the beginning of each path segment
|
|
||||||
// also don't count the beginning of the first segment
|
|
||||||
cost -= self.costs[a.1 as usize][a.0 as usize] as usize;
|
|
||||||
}
|
|
||||||
cost
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
#[cfg(test)]
|
|
||||||
mod tests {
|
|
||||||
use super::*;
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_max_single_direction() {
|
|
||||||
let map: Map = r#"
|
|
||||||
11111
|
|
||||||
22222
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
assert_eq!(
|
|
||||||
map.dijkstra_ish((0, 0), (4, 1), Map::part1_edges),
|
|
||||||
Some(vec![(0, 0), (1, 0), (2, 0), (3, 0), (3, 1), (4, 1)])
|
|
||||||
);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_example_small() {
|
|
||||||
let map: Map = r#"
|
|
||||||
24134
|
|
||||||
32154
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
assert_eq!(
|
|
||||||
map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part1_edges
|
|
||||||
),
|
|
||||||
Some(vec![(0, 0), (1, 0), (2, 0), (2, 1), (3, 1), (4, 1)])
|
|
||||||
);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_example() {
|
|
||||||
let map: Map = r#"
|
|
||||||
2413432311323
|
|
||||||
3215453535623
|
|
||||||
3255245654254
|
|
||||||
3446585845452
|
|
||||||
4546657867536
|
|
||||||
1438598798454
|
|
||||||
4457876987766
|
|
||||||
3637877979653
|
|
||||||
4654967986887
|
|
||||||
4564679986453
|
|
||||||
1224686865563
|
|
||||||
2546548887735
|
|
||||||
4322674655533
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
let path = dbg!(map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part1_edges
|
|
||||||
));
|
|
||||||
assert_eq!(map.path_cost(&path.unwrap()), 102);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_part2_example1() {
|
|
||||||
let map: Map = r#"
|
|
||||||
2413432311323
|
|
||||||
3215453535623
|
|
||||||
3255245654254
|
|
||||||
3446585845452
|
|
||||||
4546657867536
|
|
||||||
1438598798454
|
|
||||||
4457876987766
|
|
||||||
3637877979653
|
|
||||||
4654967986887
|
|
||||||
4564679986453
|
|
||||||
1224686865563
|
|
||||||
2546548887735
|
|
||||||
4322674655533
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
let path = dbg!(map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part2_edges
|
|
||||||
));
|
|
||||||
assert_eq!(map.part2_path_cost(&path.unwrap()), 94);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_part2_example2() {
|
|
||||||
let map: Map = r#"
|
|
||||||
111111111111
|
|
||||||
999999999991
|
|
||||||
999999999991
|
|
||||||
999999999991
|
|
||||||
999999999991
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
let path = dbg!(map.dijkstra_ish(
|
|
||||||
(0, 0),
|
|
||||||
(map.width as isize - 1, map.height as isize - 1),
|
|
||||||
Map::part2_edges
|
|
||||||
));
|
|
||||||
assert_eq!(map.part2_path_cost(&path.unwrap()), 71);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_part2_input_subgrid() {
|
|
||||||
let map: Map = r#"
|
|
||||||
645655655636632423532352254234
|
|
||||||
353344463432453352632231125552
|
|
||||||
526342234456245465642135234421
|
|
||||||
346523323446362131122522334552
|
|
||||||
344544334245121341153154552255
|
|
||||||
545315342221553551233455324225
|
|
||||||
312521155444131243522241333531
|
|
||||||
153145243235542533153124432435
|
|
||||||
133522524342325151543155414215
|
|
||||||
"#
|
|
||||||
.into();
|
|
||||||
assert_eq!(
|
|
||||||
map.part2_path_cost(&[(0, 8), (9, 8), (9, 4), (19, 4), (19, 0), (29, 0),]),
|
|
||||||
110
|
|
||||||
);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
@ -17,8 +17,7 @@ mod day13;
|
||||||
mod day14;
|
mod day14;
|
||||||
mod day15;
|
mod day15;
|
||||||
mod day16;
|
mod day16;
|
||||||
mod day17;
|
|
||||||
|
|
||||||
fn main() {
|
fn main() {
|
||||||
day17::run();
|
day16::run();
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue