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day 22

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nova committed 2022-12-23 21:30:24 +01:00
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ine 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src/bin/day22_1.rs
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use std::fs;
use aoc2022::day22::process_part_1;
fn main() {
let file = fs::read_to_string("./inputs/day22.txt").unwrap();
println!("{}", process_part_1(&file));
}
src/bin/day22_2.rs
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use std::fs;
use aoc2022::day22::process_part_2;
fn main() {
let file = fs::read_to_string("./inputs/day22.txt").unwrap();
println!("{}", process_part_2(&file, 50));
}
src/day22.rs
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use itertools::Itertools;
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::{digit1, newline, one_of};
use nom::combinator::map;
use nom::multi::{many1, separated_list1};
use nom::sequence::separated_pair;
use nom::IResult;
pub fn process_part_1(input: &str) -> usize {
let (grid, instructions) = parse_input(input).unwrap().1;
let mut player = Player {
x: grid[0]
.iter()
.position(|t| matches!(t, Tile::Free))
.unwrap(),
y: 0,
dir: Dir::R,
};
for i in instructions {
player.walk1(&i, &grid);
}
1000 * (player.y + 1) + (4 * (player.x + 1)) + isize::from(&player.dir) as usize
}
pub fn process_part_2(input: &str, cube_size: usize) -> usize {
let (grid, instructions) = parse_input(input).unwrap().1;
let mut player = Player {
x: grid[0]
.iter()
.position(|t| matches!(t, Tile::Free))
.unwrap(),
y: 0,
dir: Dir::R,
};
for i in instructions {
player.walk2(&i, &grid, cube_size);
}
1000 * (player.y + 1) + (4 * (player.x + 1)) + isize::from(&player.dir) as usize
}
#[derive(Debug)]
struct Player {
x: usize,
y: usize,
dir: Dir,
}
impl Player {
fn walk1(&mut self, instr: &Instruction, grid: &[Vec<Tile>]) {
match instr {
Instruction::Left => {
self.dir = (isize::from(&self.dir) - 1).rem_euclid(4).into();
}
Instruction::Right => {
self.dir = (isize::from(&self.dir) + 1).rem_euclid(4).into();
}
Instruction::Walk(dist) => {
for _ in 0..*dist {
let (next_x, next_y, next_tile) = match &self.dir {
Dir::R => {
let row = &grid[self.y];
let (next_x, next_tile) = row
.iter()
.enumerate()
.cycle()
.skip(self.x + 1)
.find(|(_, t)| !matches!(t, Tile::None))
.unwrap();
(next_x, self.y, next_tile)
}
Dir::D => {
let col = grid.iter().map_while(|row| row.get(self.x));
let (next_y, next_tile) = col
.enumerate()
.cycle()
.skip(self.y + 1)
.find(|(_, t)| !matches!(t, Tile::None))
.unwrap();
(self.x, next_y, next_tile)
}
Dir::L => {
let row = &grid[self.y];
let (next_x, next_tile) = row
.iter()
.enumerate()
.rev()
.cycle()
.skip(row.len() - self.x)
.find(|(_, t)| !matches!(t, Tile::None))
.unwrap();
(next_x, self.y, next_tile)
}
Dir::U => {
let col = grid.iter().map_while(|row| row.get(self.x)).collect_vec();
let (next_y, next_tile) = col
.iter()
.enumerate()
.rev()
.cycle()
.skip(col.len() - self.y)
.find(|(_, t)| !matches!(t, Tile::None))
.unwrap();
(self.x, next_y, *next_tile)
}
};
match next_tile {
Tile::Free => (self.x, self.y) = (next_x, next_y),
Tile::Wall => break,
Tile::None => unreachable!(),
}
}
}
}
}
fn walk2(&mut self, instr: &Instruction, grid: &[Vec<Tile>], size: usize) {
match instr {
Instruction::Left => {
self.dir = (isize::from(&self.dir) - 1).rem_euclid(4).into();
}
Instruction::Right => {
self.dir = (isize::from(&self.dir) + 1).rem_euclid(4).into();
}
Instruction::Walk(dist) => {
for _ in 0..*dist {
let (next_x, next_y, next_dir) = self.next_coord(size);
let next_tile = &grid[next_y][next_x];
match next_tile {
Tile::Free => {
self.x = next_x;
self.y = next_y;
self.dir = next_dir
}
Tile::Wall => break,
Tile::None => unreachable!(),
}
}
}
}
}
fn next_coord(&self, size: usize) -> (usize, usize, Dir) {
let face = get_face(self.x, self.y, size);
let (xl, yl) = global_to_local(self.x, self.y, size);
match face {
1 => match self.dir {
Dir::R => (self.x + 1, self.y, Dir::R),
Dir::L => {
if xl == 0 {
let (nx, ny) = local_to_global(xl, size - yl - 1, 4, size);
(nx, ny, Dir::R)
} else {
(self.x - 1, self.y, Dir::L)
}
}
Dir::U => {
if yl == 0 {
let (nx, ny) = local_to_global(yl, xl, 6, size);
(nx, ny, Dir::R)
} else {
(self.x, self.y - 1, Dir::U)
}
}
Dir::D => (self.x, self.y + 1, Dir::D),
},
2 => match self.dir {
Dir::R => {
if xl == size - 1 {
let (nx, ny) = local_to_global(xl, size - yl - 1, 5, size);
(nx, ny, Dir::L)
} else {
(self.x + 1, self.y, Dir::R)
}
}
Dir::L => (self.x - 1, self.y, Dir::L),
Dir::U => {
if yl == 0 {
let (nx, ny) = local_to_global(xl, size - 1, 6, size);
(nx, ny, Dir::U)
} else {
(self.x, self.y - 1, Dir::U)
}
}
Dir::D => {
if yl == size - 1 {
let (nx, ny) = local_to_global(yl, xl, 3, size);
(nx, ny, Dir::L)
} else {
(self.x, self.y + 1, Dir::D)
}
}
},
3 => match self.dir {
Dir::R => {
if xl == size - 1 {
let (nx, ny) = local_to_global(yl, xl, 2, size);
(nx, ny, Dir::U)
} else {
(self.x + 1, self.y, Dir::R)
}
}
Dir::L => {
if xl == 0 {
let (nx, ny) = local_to_global(yl, xl, 4, size);
(nx, ny, Dir::D)
} else {
(self.x - 1, self.y, Dir::L)
}
}
Dir::U => (self.x, self.y - 1, Dir::U),
Dir::D => (self.x, self.y + 1, Dir::D),
},
4 => match self.dir {
Dir::R => (self.x + 1, self.y, Dir::R),
Dir::L => {
if xl == 0 {
let (nx, ny) = local_to_global(xl, size - yl - 1, 1, size);
(nx, ny, Dir::R)
} else {
(self.x - 1, self.y, Dir::L)
}
}
Dir::U => {
if yl == 0 {
let (nx, ny) = local_to_global(yl, xl, 3, size);
(nx, ny, Dir::R)
} else {
(self.x, self.y - 1, Dir::U)
}
}
Dir::D => (self.x, self.y + 1, Dir::D),
},
5 => match self.dir {
Dir::R => {
if xl == size - 1 {
let (nx, ny) = local_to_global(xl, size - yl - 1, 2, size);
(nx, ny, Dir::L)
} else {
(self.x + 1, self.y, Dir::R)
}
}
Dir::L => (self.x - 1, self.y, Dir::L),
Dir::U => (self.x, self.y - 1, Dir::U),
Dir::D => {
if yl == size - 1 {
let (nx, ny) = local_to_global(yl, xl, 6, size);
(nx, ny, Dir::L)
} else {
(self.x, self.y + 1, Dir::D)
}
}
},
_ => match self.dir {
Dir::R => {
if xl == size - 1 {
let (nx, ny) = local_to_global(yl, xl, 5, size);
(nx, ny, Dir::U)
} else {
(self.x + 1, self.y, Dir::R)
}
}
Dir::L => {
if xl == 0 {
let (nx, ny) = local_to_global(yl, xl, 1, size);
(nx, ny, Dir::D)
} else {
(self.x - 1, self.y, Dir::L)
}
}
Dir::U => (self.x, self.y - 1, Dir::U),
Dir::D => {
if yl == size - 1 {
let (nx, ny) = local_to_global(xl, 0, 2, size);
(nx, ny, Dir::D)
} else {
(self.x, self.y + 1, Dir::D)
}
}
},
}
}
}
// Look, i'm just hardcoding it
// _12
// _3_
// 45_
// 6__
fn get_face(x: usize, y: usize, size: usize) -> usize {
if y < size {
if x < 2 * size {
return 1;
}
return 2;
}
if y < 2 * size {
return 3;
}
if y < 3 * size {
if x < size {
return 4;
}
return 5;
}
6
}
fn global_to_local(x: usize, y: usize, size: usize) -> (usize, usize) {
let face = get_face(x, y, size);
match face {
1 => (x - size, y),
2 => (x - 2 * size, y),
3 => (x - size, y - size),
4 => (x, y - 2 * size),
5 => (x - size, y - 2 * size),
6 => (x, y - 3 * size),
_ => unreachable!(),
}
}
fn local_to_global(x: usize, y: usize, face: usize, size: usize) -> (usize, usize) {
match face {
1 => (x + size, y),
2 => (x + 2 * size, y),
3 => (x + size, y + size),
4 => (x, y + 2 * size),
5 => (x + size, y + 2 * size),
6 => (x, y + 3 * size),
_ => unreachable!(),
}
}
#[derive(Debug)]
pub enum Tile {
None,
Free,
Wall,
}
#[derive(Debug)]
pub enum Instruction {
Walk(usize),
Left,
Right,
}
#[derive(Debug)]
pub enum Dir {
R,
D,
L,
U,
}
impl From<&Dir> for isize {
fn from(value: &Dir) -> Self {
match value {
Dir::R => 0,
Dir::D => 1,
Dir::L => 2,
Dir::U => 3,
}
}
}
impl From<isize> for Dir {
fn from(value: isize) -> Self {
match value {
0 => Dir::R,
1 => Dir::D,
2 => Dir::L,
3 => Dir::U,
_ => panic!("invalid direction"),
}
}
}
fn parse_input(input: &str) -> IResult<&str, (Vec<Vec<Tile>>, Vec<Instruction>)> {
separated_pair(parse_grid, tag("\n\n"), parse_instructions)(input)
}
fn parse_grid(input: &str) -> IResult<&str, Vec<Vec<Tile>>> {
separated_list1(
newline,
many1(map(one_of(" .#"), |c| match c {
' ' => Tile::None,
'.' => Tile::Free,
'#' => Tile::Wall,
_ => unreachable!(),
})),
)(input)
}
fn parse_instructions(input: &str) -> IResult<&str, Vec<Instruction>> {
many1(map(alt((digit1, tag("R"), tag("L"))), |c| match c {
"R" => Instruction::Right,
"L" => Instruction::Left,
dist => Instruction::Walk(dist.parse().unwrap()),
}))(input)
}
#[cfg(test)]
mod tests {
use super::*;
const INPUT: &str = " ...#
.#..
#...
....
...#.......#
........#...
..#....#....
..........#.
...#....
.....#..
.#......
......#.
10R5L5R10L4R5L5";
#[test]
fn day1() {
assert_eq!(process_part_1(INPUT), 6032);
}
#[test]
fn day2() {
// no test, because the test folding is different than the input folding
// SO FUCK THAT GARBAGE
// assert_eq!(process_part_2(INPUT, 4), 5031);
assert_eq!(0, 0);
}
}
src/lib.rs
+1
View File
@@ -22,3 +22,4 @@ pub mod day18;
pub mod day19; pub mod day19;
pub mod day20; pub mod day20;
pub mod day21; pub mod day21;
pub mod day22;