bert/adventofcode
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base: bert:09e012c082d495c059ee8726711330bed355157e
Branches Tags
bert:master bert:2022/day-08-part-2-o-n bert:2022/4-ranges bert:2022/day-2-allocless bert:2021-day23
...
compare: bert:2021-day23
Branches Tags
bert:master bert:2022/day-08-part-2-o-n bert:2022/4-ranges bert:2022/day-2-allocless bert:2021-day23

16 Commits
09e012c082 ... 2021-day23

Author SHA1 Message Date
Bert Peters
81f244bde9 Implementation day 23 2021-12-31 17:44:31 +01:00
Bert Peters
09b590e927 Update southbound comment 2021-12-29 15:39:20 +01:00
Bert Peters
9dacb4c1ae Perform updates in-place 2021-12-29 15:29:21 +01:00
Bert Peters
07e03c1630 Implement day 25 2021-12-29 15:09:43 +01:00
Bert Peters
3accf9845d Better code reuse, almost generic over dimensions 2021-12-29 14:19:58 +01:00
Bert Peters
fd26f58e25 Implement day 22 part 2 (and 1 again) 2021-12-29 14:07:52 +01:00
Bert Peters
b2f9898714 Reduce code duplication 2021-12-26 12:32:07 +01:00
Bert Peters
d757c389f0 Replace inefficient recursion with iteration 2021-12-26 11:24:45 +01:00
Bert Peters
fd561a3e9d Clippy suggestions 2021-12-22 21:16:27 +01:00
Bert Peters
2fcdc6b8d2 Brute force day 22 part 1 2021-12-22 21:12:15 +01:00
Bert Peters
8a3f0f843c Finally discovered that pos != new_pos 2021-12-22 20:36:58 +01:00
Bert Peters
23b5c39838 Add inputs day 21 2021-12-22 20:04:29 +01:00
Bert Peters
452f6e5f14 Implement fast day 21 part 1 2021-12-21 09:35:50 +01:00
Bert Peters
61fb240622 Avoid 2/3 hashmap lookups 2021-12-20 18:24:37 +01:00
Bert Peters
aee25057d6 Avoid allocations 2021-12-20 18:14:36 +01:00
Bert Peters
a98332894f Brute force implementation day 20 2021-12-20 18:08:48 +01:00
20 changed files with 1917 additions and 23 deletions
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13
2021/benches/days.rs
View File

@@ -7,7 +7,7 @@ use criterion::criterion_main;
use criterion::BenchmarkId;
use criterion::Criterion;
const DAYS_IMPLEMENTED: usize = 18;
const DAYS_IMPLEMENTED: usize = 25;
fn read_input(day: usize) -> Vec<u8> {
let input_path = format!("inputs/{:02}.txt", day);
@@ -26,15 +26,18 @@ pub fn benchmark_days(c: &mut Criterion) {
let input = read_input(day);
let part1 = get_implementation(day, false);
let part2 = get_implementation(day, true);
c.bench_with_input(BenchmarkId::new("part1", day), &input, |b, i| {
b.iter(|| part1(&mut &i[..]));
});
c.bench_with_input(BenchmarkId::new("part2", day), &input, |b, i| {
b.iter(|| part2(&mut &i[..]));
});
if day < 25 {
let part2 = get_implementation(day, true);
c.bench_with_input(BenchmarkId::new("part2", day), &input, |b, i| {
b.iter(|| part2(&mut &i[..]));
});
}
}
}

102
2021/inputs/20.txt Normal file
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2
2021/inputs/21.txt Normal file
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@@ -0,0 +1,2 @@
Player 1 starting position: 9
Player 2 starting position: 4

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2021/inputs/22.txt Normal file
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@@ -0,0 +1,420 @@
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2021/inputs/23.txt Normal file
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2021/inputs/24.txt Normal file
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2021/inputs/25.txt Normal file
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2
2021/src/day11.rs
View File

@@ -79,7 +79,7 @@ pub fn part2(input: &mut dyn Read) -> String {
let mut grid = read_grid(input, &mut buffer);
let mut todo = Vec::new();
let target = grid.iter().map(|line| line.len()).sum();
let target: usize = grid.iter().map(|line| line.len()).sum();
(1..)
.find(|_| advance(&mut grid, &mut todo) == target)

112
2021/src/day20.rs
View File

@@ -1,9 +1,113 @@
use std::collections::HashSet;
use std::io::Read;
use std::mem::swap;
pub fn part1(_input: &mut dyn Read) -> String {
todo!()
type Translation = [bool; 512];
type Point = (i32, i32);
type Field = HashSet<Point>;
fn read_input(input: &mut dyn Read) -> (Translation, Field) {
let mut buffer = Vec::new();
input.read_to_end(&mut buffer).unwrap();
let mut translation = [false; 512];
let mut it = buffer.split(|&b| b == b'\n');
translation
.iter_mut()
.zip(it.next().unwrap())
.for_each(|(t, &c)| *t = c == b'#');
let mut field = Field::default();
for (y, line) in it.skip(1).enumerate() {
for (x, _) in line.iter().enumerate().filter(|(_, &c)| c == b'#') {
field.insert((x as i32, y as i32));
}
}
(translation, field)
}
pub fn part2(_input: &mut dyn Read) -> String {
todo!()
fn find_dimensions(field: &Field) -> ((i32, i32), (i32, i32)) {
field
.iter()
.fold(((0, 0), (0, 0)), |((xmin, xmax), (ymin, ymax)), &(x, y)| {
((xmin.min(x), xmax.max(x)), (ymin.min(y), ymax.max(y)))
})
}
fn advance(translation: &Translation, field: &Field, new_field: &mut Field, infinity: &mut bool) {
const INDEX_MASK: usize = (1 << 9) - 1;
new_field.clear();
let ((xmin, xmax), (ymin, ymax)) = find_dimensions(field);
for x in (xmin - 1)..=(xmax + 1) {
let mut index = if *infinity { INDEX_MASK } else { 0 };
for y in (ymin - 1)..=(ymax + 1) {
for dx in -1..=1 {
index <<= 1;
let nx = x + dx;
let ny = y + 1;
if nx < xmin || nx > xmax || ny < ymin || ny > ymax {
index |= *infinity as usize;
} else if field.contains(&(nx, ny)) {
index |= 1;
}
}
index &= INDEX_MASK;
if translation[index] {
new_field.insert((x, y));
}
}
}
*infinity = translation[if *infinity { 511 } else { 0 }]
}
fn parts_common(input: &mut dyn Read, count: usize) -> String {
let (translation, mut field) = read_input(input);
let mut new_field = Field::new();
let mut infinity = false;
for _ in 0..count {
advance(&translation, &field, &mut new_field, &mut infinity);
swap(&mut field, &mut new_field);
}
field.len().to_string()
}
pub fn part1(input: &mut dyn Read) -> String {
parts_common(input, 2)
}
pub fn part2(input: &mut dyn Read) -> String {
parts_common(input, 50)
}
#[cfg(test)]
mod tests {
use crate::test_implementation;
use super::*;
const SAMPLE: &[u8] = include_bytes!("samples/20.txt");
#[test]
fn sample_part1() {
test_implementation(part1, SAMPLE, 35);
}
#[test]
fn sample_part2() {
test_implementation(part2, SAMPLE, 3351);
}
}

170
2021/src/day21.rs
View File

@@ -1,9 +1,171 @@
use std::io::Read;
pub fn part1(_input: &mut dyn Read) -> String {
todo!()
use crate::common::LineIter;
fn read_input(input: &mut dyn Read) -> (i32, i32) {
let mut reader = LineIter::new(input);
let mut helper = || {
reader
.next()
.unwrap()
.split(' ')
.last()
.unwrap()
.parse()
.unwrap()
};
let a = helper();
let b = helper();
(a, b)
}
pub fn part2(_input: &mut dyn Read) -> String {
todo!()
#[inline]
fn simulate(die: i32, pos: i32) -> i32 {
(pos + 3 * die + 3 - 1) % 10 + 1
}
fn find_repetition(mut pos: i32, mut die: i32) -> i32 {
let mut advance = 0;
for _ in 0..10 {
pos = simulate(die, pos);
advance += pos;
die = (die + 6) % 10;
}
advance
}
pub fn part1(input: &mut dyn Read) -> String {
const TARGET_SCORE: i32 = 1000;
let (mut a, mut b) = read_input(input);
let a10 = find_repetition(a, 1);
let b10 = find_repetition(b, 4);
let a_win = TARGET_SCORE / a10;
let b_win = TARGET_SCORE / b10;
let win = a_win.min(b_win);
let mut a_score = win * a10;
let mut b_score = win * b10;
let mut die = 1;
let mut rolls = 3 * 20 * win;
let (loser_score, rolls) = if a_win < b_win {
while a_score < TARGET_SCORE {
a = simulate(die, a);
a_score += a;
rolls += 3;
if a_score < TARGET_SCORE {
b = simulate(die + 3, b);
b_score += b;
rolls += 3;
}
die = (die + 6) % 10;
}
(b_score, rolls)
} else {
while b_score < TARGET_SCORE {
a = simulate(die, a);
a_score += a;
b = simulate(die + 3, b);
b_score += b;
rolls += 6;
die = (die + 6) % 10;
}
(a_score, rolls)
};
(loser_score * rolls).to_string()
}
const MAX_TURNS: usize = 13;
const ROLLS: [i32; 7] = [3, 4, 5, 6, 7, 8, 9];
const FREQS: [u64; 7] = [1, 3, 6, 7, 6, 3, 1];
fn multiverse(pos: i32) -> ([u64; MAX_TURNS], [u64; MAX_TURNS]) {
type State = [[u64; 10]; 21];
// Let's work with pos - 1 as pos for now, indexes nicer;
let pos = pos as usize - 1;
let mut alive = [0; MAX_TURNS];
let mut wins = [0; MAX_TURNS];
alive[0] = 1;
let mut current = [[0u64; 10]; 21];
current[0][pos] = 1;
let mut next = [[0u64; 10]; 21];
let mut helper = |turn, current: &State, next: &mut State| {
next.iter_mut().flatten().for_each(|v| *v = 0);
for (score, score_row) in current.iter().enumerate() {
for (pos, &pop) in score_row.iter().enumerate() {
for (roll, freq) in ROLLS.into_iter().zip(FREQS) {
let new_pos = (pos + (roll as usize)) % 10;
let new_score = score + new_pos + 1; // +1 because above
let new_pop = freq * pop;
if new_score >= next.len() {
wins[turn] += new_pop;
} else {
alive[turn] += new_pop;
next[new_score][new_pos] += new_pop;
}
}
}
}
};
for turn in (1..MAX_TURNS).step_by(2) {
helper(turn, &current, &mut next);
helper(turn + 1, &next, &mut current);
}
(wins, alive)
}
pub fn part2(input: &mut dyn Read) -> String {
let (a, b) = read_input(input);
let (a_wins, a_alive) = multiverse(a);
let (b_wins, b_alive) = multiverse(b);
let a_winner: u64 = a_wins[1..].iter().zip(b_alive).map(|(&a, b)| a * b).sum();
let b_winner: u64 = b_wins.into_iter().zip(a_alive).map(|(a, b)| a * b).sum();
a_winner.max(b_winner).to_string()
}
#[cfg(test)]
mod tests {
use crate::test_implementation;
use super::*;
const SAMPLE: &[u8] = include_bytes!("samples/21.txt");
#[test]
fn sample_part1() {
test_implementation(part1, SAMPLE, 739785);
}
#[test]
fn sample_part2() {
test_implementation(part2, SAMPLE, 444356092776315u64);
}
}

198
2021/src/day22.rs
View File

@@ -1,9 +1,199 @@
use std::io::Read;
pub fn part1(_input: &mut dyn Read) -> String {
todo!()
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::newline;
use nom::combinator::map;
use nom::multi::separated_list1;
use nom::sequence::preceded;
use nom::sequence::separated_pair;
use nom::sequence::tuple;
use nom::IResult;
use crate::common::read_input;
type Point3 = [i32; 3];
#[derive(Debug, Eq, PartialEq)]
struct Cuboid {
lower: Point3,
upper: Point3,
}
pub fn part2(_input: &mut dyn Read) -> String {
todo!()
impl Cuboid {
pub fn new(lower: Point3, upper: Point3) -> Self {
// The input uses an inclusive range for representation, but an exclusive one simplifies a
// lot of computations, so we convert here.
Self::new_internal(lower, upper.map(|c| c + 1))
}
fn new_internal(lower: Point3, upper: Point3) -> Self {
debug_assert!(lower.iter().zip(&upper).all(|(a, b)| a < b));
Self { lower, upper }
}
pub fn is_small(&self) -> bool {
self.lower
.iter()
.chain(&self.upper.map(|c| c - 1)) // begrudgingly convert back
.all(|c| c.abs() <= 50)
}
pub fn volume(&self) -> i64 {
self.lower
.iter()
.zip(&self.upper)
.map(|(&l, &h)| (h - l) as i64)
.product()
}
fn overlaps(&self, other: &Self) -> bool {
self.lower
.iter()
.zip(&self.upper)
.zip(other.lower.iter().zip(&other.upper))
.all(|((&al, &ah), (&bl, &bh))| al < bh && bl < ah)
}
pub fn retain_nonoverlapping(&self, other: &Self, new_cubes: &mut Vec<Self>) -> bool {
if !self.overlaps(other) {
// Cube can be kept as-is.
return true;
}
let mut lower = self.lower;
let mut upper = self.upper;
for axis in 0..3 {
if other.lower[axis] > self.lower[axis] {
let mut new_upper = upper;
new_upper[axis] = other.lower[axis];
new_cubes.push(Cuboid {
lower,
upper: new_upper,
});
lower[axis] = other.lower[axis];
}
if other.upper[axis] < self.upper[axis] {
let mut new_lower = lower;
new_lower[axis] = other.upper[axis];
new_cubes.push(Cuboid {
lower: new_lower,
upper,
});
upper[axis] = other.upper[axis];
}
}
false
}
}
fn parse_tuple(input: &[u8]) -> IResult<&[u8], (i32, i32)> {
use nom::character::complete::i32;
separated_pair(i32, tag(".."), i32)(input)
}
fn parse_cuboid(input: &[u8]) -> IResult<&[u8], Cuboid> {
map(
tuple((
parse_tuple,
preceded(tag(",y="), parse_tuple),
preceded(tag(",z="), parse_tuple),
)),
|((xl, xh), (yl, yh), (zl, zh))| Cuboid::new([xl, yl, zl], [xh, yh, zh]),
)(input)
}
fn parse_input(input: &[u8]) -> IResult<&[u8], Vec<(bool, Cuboid)>> {
let parse_state = alt((map(tag("on x="), |_| true), map(tag("off x="), |_| false)));
let parse_line = tuple((parse_state, parse_cuboid));
separated_list1(newline, parse_line)(input)
}
pub fn part1(input: &mut dyn Read) -> String {
let commands = read_input(input, parse_input);
let mut cubes = Vec::new();
let mut new_cubes = Vec::new();
for (state, cube) in commands.into_iter().filter(|(_, c)| c.is_small()) {
cubes.retain(|existing: &Cuboid| existing.retain_nonoverlapping(&cube, &mut new_cubes));
// Add new cubes to the end
cubes.append(&mut new_cubes);
if state {
cubes.push(cube);
}
}
cubes.iter().map(Cuboid::volume).sum::<i64>().to_string()
}
pub fn part2(input: &mut dyn Read) -> String {
let commands = read_input(input, parse_input);
let mut cubes = Vec::new();
let mut new_cubes = Vec::new();
for (state, cube) in commands {
cubes.retain(|existing: &Cuboid| existing.retain_nonoverlapping(&cube, &mut new_cubes));
// Add new cubes to the end
cubes.append(&mut new_cubes);
if state {
cubes.push(cube);
}
}
cubes.iter().map(Cuboid::volume).sum::<i64>().to_string()
}
#[cfg(test)]
mod tests {
use crate::test_implementation;
use super::*;
const SAMPLE1: &[u8] = include_bytes!("samples/22.1.txt");
const SAMPLE2: &[u8] = include_bytes!("samples/22.2.txt");
#[test]
fn test_overlap() {
let cube_a = Cuboid {
lower: [1, 1, 1],
upper: [4, 4, 4],
};
let cube_b = Cuboid {
lower: [2, 2, 2],
upper: [3, 3, 3],
};
let mut new_cubes = Vec::new();
// B is fully inside A so it should overlap and the result should be empty
assert!(!cube_b.retain_nonoverlapping(&cube_a, &mut new_cubes));
assert_eq!(new_cubes, Vec::new());
// In the reverse case, we should have lots of new cubes
assert!(!cube_a.retain_nonoverlapping(&cube_b, &mut new_cubes));
assert_eq!(new_cubes.len(), 6);
}
#[test]
fn sample_part1() {
test_implementation(part1, SAMPLE1, 590784);
}
#[test]
fn sample_part2() {
test_implementation(part2, SAMPLE2, 2758514936282235u64);
}
}

336
2021/src/day23.rs
View File

@@ -1,9 +1,341 @@
use std::cmp::Reverse;
use std::collections::hash_map::Entry;
use std::collections::BinaryHeap;
use std::collections::HashMap;
use std::fmt::Display;
use std::io::Read;
use std::mem::swap;
pub fn part1(_input: &mut dyn Read) -> String {
todo!()
use crate::common::LineIter;
type Item = (u32, u32, State);
type Todo = BinaryHeap<Reverse<Item>>;
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Hash)]
enum Pod {
A,
B,
C,
D,
}
impl Pod {
pub fn cost(self) -> u32 {
match self {
Pod::A => 1,
Pod::B => 10,
Pod::C => 100,
Pod::D => 1000,
}
}
}
impl TryFrom<char> for Pod {
type Error = &'static str;
fn try_from(c: char) -> Result<Self, Self::Error> {
match c {
'A' => Ok(Pod::A),
'B' => Ok(Pod::B),
'C' => Ok(Pod::C),
'D' => Ok(Pod::D),
_ => Err("Invalid pod"),
}
}
}
#[derive(Debug, Default, PartialEq, Eq, PartialOrd, Ord, Clone, Hash)]
struct State {
hallway: [Option<Pod>; 7],
rooms: [[Option<Pod>; 2]; 4],
}
impl State {
pub fn is_done(&self) -> bool {
self == &State {
hallway: [None; 7],
rooms: [
[Some(Pod::A); 2],
[Some(Pod::B); 2],
[Some(Pod::C); 2],
[Some(Pod::D); 2],
],
}
}
fn add_to_queue(self, cost: u32, todo: &mut Todo, visited: &mut HashMap<Self, u32>) {
let entry = visited.entry(self.clone());
if matches!(&entry, Entry::Occupied(entry) if *entry.get() <= cost) {
// Already got a better one
return;
}
// print!("Next: \n{}", self);
// nightly only :'(
// entry.insert(cost);
*entry.or_default() = cost;
todo.push(Reverse((cost + self.estimate(), cost, self)))
}
fn estimate(&self) -> u32 {
// A* estimate. For every entry that is not already "at rest", the cost is the cost
// required to get it to the top of its intended room.
let mut estimate = 0;
for (x, &pod) in self.hallway.iter().enumerate() {
if let Some(pod) = pod {
let cost = if x == 0 {
4 + pod as u32 * 2
} else if x == 6 {
4 + (3 - pod as u32) * 2
} else if x <= (pod as usize) + 1 {
2 + 2 * (pod as u32 + (x as u32 - 1))
} else {
2 + 2 * (x as u32 - pod as u32 - 2)
};
estimate += cost * pod.cost();
}
}
for (index, room) in self.rooms.iter().enumerate() {
if let Some(last) = room
.iter()
.rposition(|&pod| !matches!(pod, Some(pod) if pod as usize == index))
{
for pos in 0..=last {
if let Some(pod) = room[pos] {
if pod as usize != index {
let abs_diff = index.max(pod as usize) - index.min(pod as usize);
estimate += (pos + 2 + 2 * abs_diff) as u32 * pod.cost();
}
}
}
}
}
estimate
}
pub fn generate_next(&self, cost: u32, todo: &mut Todo, visited: &mut HashMap<Self, u32>) {
self.generate_hallway(cost, todo, visited);
self.generate_rooms(cost, todo, visited);
}
fn generate_rooms(&self, cost: u32, todo: &mut Todo, visited: &mut HashMap<Self, u32>) {
for (index, room) in self.rooms.iter().enumerate() {
// Check what part of the room should still move
if let Some(last) = room
.iter()
.rposition(|&pod| !matches!(pod, Some(pod) if pod as usize == index))
{
for pos in 0..=last {
let pod = match room[pos] {
Some(pod) => pod,
None => continue,
};
// Check if we can move up
if pos > 0 && room[pos - 1].is_none() {
let mut new_state = self.clone();
new_state.rooms[index].swap(pos, pos - 1);
let new_cost = cost + pod.cost();
new_state.add_to_queue(new_cost, todo, visited);
}
// Check if we can move down
if pos + 1 < room.len() && room[pos + 1].is_none() {
let mut new_state = self.clone();
new_state.rooms[index].swap(pos, pos + 1);
let new_cost = cost + pod.cost();
new_state.add_to_queue(new_cost, todo, visited);
}
}
// Check if we can pop out of the room
if let Some(pod) = room[0] {
for pos in [index + 1, index + 2] {
if self.hallway[pos].is_none() {
let mut new_state = self.clone();
swap(&mut new_state.rooms[index][0], &mut new_state.hallway[pos]);
let new_cost = cost + pod.cost();
new_state.add_to_queue(new_cost, todo, visited);
}
}
}
}
}
}
fn generate_hallway(&self, cost: u32, todo: &mut Todo, visited: &mut HashMap<Self, u32>) {
for index in 0..self.hallway.len() {
let pod = if let Some(pod) = self.hallway[index] {
pod
} else {
continue;
};
// Check if we can move right
if index + 1 < self.hallway.len() && self.hallway[index + 1].is_none() {
let mut new_state = self.clone();
new_state.hallway.swap(index, index + 1);
let added_cost = if index == 0 || index == 5 {
pod.cost()
} else {
2 * pod.cost()
};
let new_cost = cost + added_cost;
new_state.add_to_queue(new_cost, todo, visited);
}
// Check if we can move left
if index > 1 && self.hallway[index - 1].is_none() {
let mut new_state = self.clone();
new_state.hallway.swap(index, index - 1);
let added_cost = if index == 1 || index == 6 {
pod.cost()
} else {
2 * pod.cost()
};
let new_cost = cost + added_cost;
new_state.add_to_queue(new_cost, todo, visited);
}
// Check if we can pop into a room to the right
if (1..=4).contains(&index) && self.rooms[index - 1][0].is_none() {
let mut new_state = self.clone();
swap(
&mut new_state.hallway[index],
&mut new_state.rooms[index - 1][0],
);
let new_cost = cost + 2 * pod.cost();
new_state.add_to_queue(new_cost, todo, visited);
}
if (2..=5).contains(&index) && self.rooms[index - 2][0].is_none() {
let mut new_state = self.clone();
swap(
&mut new_state.hallway[index],
&mut new_state.rooms[index - 2][0],
);
let new_cost = cost + 2 * pod.cost();
new_state.add_to_queue(new_cost, todo, visited);
}
}
}
}
impl Display for State {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let helper = |opt_pod| match opt_pod {
Some(Pod::A) => 'A',
Some(Pod::B) => 'B',
Some(Pod::C) => 'C',
Some(Pod::D) => 'D',
None => '.',
};
writeln!(f, "#############")?;
write!(f, "#{}{}", helper(self.hallway[0]), helper(self.hallway[1]))?;
for i in 2..=5 {
write!(f, ".{}", helper(self.hallway[i]))?;
}
writeln!(f, "{}#", helper(self.hallway[6]))?;
for i in 0..(self.rooms[0].len()) {
writeln!(
f,
" #{}#{}#{}#{}#",
helper(self.rooms[0][i]),
helper(self.rooms[1][i]),
helper(self.rooms[2][i]),
helper(self.rooms[3][i])
)?;
}
write!(f, " #########")
}
}
fn read_input(input: &mut dyn Read) -> State {
let mut reader = LineIter::new(input);
let mut state = State::default();
let _ = reader.next();
let _ = reader.next();
let mut helper = |idx: usize| {
reader
.next()
.unwrap()
.chars()
.filter_map(|c| Pod::try_from(c).ok())
.zip(&mut state.rooms)
.for_each(|(pod, room)| room[idx] = Some(pod))
};
helper(0);
helper(1);
state
}
pub fn part1(input: &mut dyn Read) -> String {
let state = read_input(input);
let mut todo = Todo::new();
let mut visited = HashMap::new();
visited.insert(state.clone(), 0);
todo.push(Reverse((state.estimate(), 0, state)));
while let Some(Reverse((_, cost, state))) = todo.pop() {
if state.is_done() {
return cost.to_string();
}
// println!("\nExpanding:\n{}", state);
state.generate_next(cost, &mut todo, &mut visited);
}
panic!("No route found!")
}
pub fn part2(_input: &mut dyn Read) -> String {
todo!()
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_implementation;
const SAMPLE: &[u8] = include_bytes!("samples/23.txt");
#[test]
fn test_is_done() {
let state = State {
hallway: Default::default(),
rooms: [
[Some(Pod::A); 2],
[Some(Pod::B), Some(Pod::B)],
[Some(Pod::C), Some(Pod::C)],
[Some(Pod::D), Some(Pod::D)],
],
};
assert!(state.is_done());
}
#[test]
fn sample_part1() {
test_implementation(part1, SAMPLE, 12521);
}
}

84
2021/src/day25.rs
View File

@@ -1,5 +1,85 @@
use std::io::Read;
pub fn part1(_input: &mut dyn Read) -> String {
todo!()
fn read_input(input: &mut dyn Read) -> (usize, Vec<u8>) {
let mut result = Vec::new();
input.read_to_end(&mut result).unwrap();
let width = result.iter().position(|&c| c == b'\n').unwrap();
result.retain(|c| !c.is_ascii_whitespace());
(width, result)
}
fn advance(width: usize, state: &mut [u8]) -> bool {
debug_assert_eq!(state.len() % width, 0);
let mut changes = false;
// Move the eastbound herd
for src in state.chunks_exact_mut(width) {
let swap_last = src[0] == b'.' && src[width - 1] == b'>';
let mut x = 0;
while x < src.len() - 1 {
if src[x] == b'>' && src[x + 1] == b'.' {
src.swap(x, x + 1);
changes = true;
x += 2;
} else {
x += 1;
}
}
if swap_last {
src.swap(0, width - 1);
changes = true;
}
}
// Then move the southbound herd. Need to do by column because of the first entry special case
for x in 0..width {
let last_index = state.len() - width + x;
let swap_last = state[x] == b'.' && state[last_index] == b'v';
let mut offset = x;
while offset < state.len() - width {
if state[offset] == b'v' && state[offset + width] == b'.' {
state.swap(offset, offset + width);
changes = true;
offset += 2 * width;
} else {
offset += width;
}
}
if swap_last {
state.swap(x, last_index);
changes = true;
}
}
changes
}
pub fn part1(input: &mut dyn Read) -> String {
let (width, mut state) = read_input(input);
(1..)
.find(|_| !advance(width, &mut state))
.unwrap()
.to_string()
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_implementation;
const SAMPLE: &[u8] = include_bytes!("samples/25.txt");
#[test]
fn sample_part1() {
test_implementation(part1, SAMPLE, 58);
}
}

2
2021/src/lib.rs
View File

@@ -92,7 +92,7 @@ pub fn get_implementation(day: usize, part2: bool) -> Solution {
#[cfg(test)]
fn test_implementation(solution: Solution, data: &[u8], answer: impl ToString) {
let result = solution(&mut data.as_ref());
let result = solution(&mut &data[..]);
assert_eq!(answer.to_string(), result);
}

7
2021/src/samples/20.txt Normal file
View File

@@ -0,0 +1,7 @@
..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
#..#.
#....
##..#
..#..
..###

2
2021/src/samples/21.txt Normal file
View File

@@ -0,0 +1,2 @@
Player 1 starting position: 4
Player 2 starting position: 8

22
2021/src/samples/22.1.txt Normal file
View File

@@ -0,0 +1,22 @@
on x=-20..26,y=-36..17,z=-47..7
on x=-20..33,y=-21..23,z=-26..28
on x=-22..28,y=-29..23,z=-38..16
on x=-46..7,y=-6..46,z=-50..-1
on x=-49..1,y=-3..46,z=-24..28
on x=2..47,y=-22..22,z=-23..27
on x=-27..23,y=-28..26,z=-21..29
on x=-39..5,y=-6..47,z=-3..44
on x=-30..21,y=-8..43,z=-13..34
on x=-22..26,y=-27..20,z=-29..19
off x=-48..-32,y=26..41,z=-47..-37
on x=-12..35,y=6..50,z=-50..-2
off x=-48..-32,y=-32..-16,z=-15..-5
on x=-18..26,y=-33..15,z=-7..46
off x=-40..-22,y=-38..-28,z=23..41
on x=-16..35,y=-41..10,z=-47..6
off x=-32..-23,y=11..30,z=-14..3
on x=-49..-5,y=-3..45,z=-29..18
off x=18..30,y=-20..-8,z=-3..13
on x=-41..9,y=-7..43,z=-33..15
on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
on x=967..23432,y=45373..81175,z=27513..53682

60
2021/src/samples/22.2.txt Normal file
View File

@@ -0,0 +1,60 @@
on x=-5..47,y=-31..22,z=-19..33
on x=-44..5,y=-27..21,z=-14..35
on x=-49..-1,y=-11..42,z=-10..38
on x=-20..34,y=-40..6,z=-44..1
off x=26..39,y=40..50,z=-2..11
on x=-41..5,y=-41..6,z=-36..8
off x=-43..-33,y=-45..-28,z=7..25
on x=-33..15,y=-32..19,z=-34..11
off x=35..47,y=-46..-34,z=-11..5
on x=-14..36,y=-6..44,z=-16..29
on x=-57795..-6158,y=29564..72030,z=20435..90618
on x=36731..105352,y=-21140..28532,z=16094..90401
on x=30999..107136,y=-53464..15513,z=8553..71215
on x=13528..83982,y=-99403..-27377,z=-24141..23996
on x=-72682..-12347,y=18159..111354,z=7391..80950
on x=-1060..80757,y=-65301..-20884,z=-103788..-16709
on x=-83015..-9461,y=-72160..-8347,z=-81239..-26856
on x=-52752..22273,y=-49450..9096,z=54442..119054
on x=-29982..40483,y=-108474..-28371,z=-24328..38471
on x=-4958..62750,y=40422..118853,z=-7672..65583
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5
2021/src/samples/23.txt Normal file
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@@ -0,0 +1,5 @@
#############
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9
2021/src/samples/25.txt Normal file
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