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Day 15

Browse source 
Today was chill, i loved it
This commit is contained in:
Tyler Beckman 2023-12-14 23:16:08 -07:00
parent c585c139a5
commit 07b9da7a08
Signed by: Ty
GPG key ID: 2813440C772555A4
4 changed files with 169 additions and 31 deletions
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116
lib/src/day14/mod.rs
View file

@ -16,14 +16,18 @@ impl Day14 {
fn rotate(left: bool, array: &mut [[char; SIZE]; SIZE]) {
let mut rot = [['.'; SIZE]; SIZE];
match left {
false => for i in 0..SIZE {
for j in 0..SIZE {
rot[i][j] = array[SIZE - j - 1][i];
false => {
for i in 0..SIZE {
for j in 0..SIZE {
rot[i][j] = array[SIZE - j - 1][i];
}
}
},
true => for i in 0..SIZE {
for j in 0..SIZE {
rot[i][j] = array[j][SIZE - i - 1];
}
true => {
for i in 0..SIZE {
for j in 0..SIZE {
rot[i][j] = array[j][SIZE - i - 1];
}
}
}
}
@ -34,20 +38,27 @@ impl Day14 {
impl Day for Day14 {
fn part1(&mut self) -> String {
let mut square_rocks = HashMap::<usize /* column index */, usize /* row index */>::new();
let mut new_dish = vec![vec![false; self.input.lines().next().unwrap().len()]; self.input.lines().count()];
let mut new_dish =
vec![vec![false; self.input.lines().next().unwrap().len()]; self.input.lines().count()];
for (i, row) in self.input.lines().enumerate() {
for (j, char) in row.chars().enumerate() {
match char {
'.' => continue,
'#' => { square_rocks.insert(j, i); },
'#' => {
square_rocks.insert(j, i);
}
'O' => {
let mut k = square_rocks.get(&j).map(|n| n + 1).unwrap_or(0);
loop {
if new_dish[k][j] != true { new_dish[k][j] = true; break }
else { k += 1; }
if new_dish[k][j] != true {
new_dish[k][j] = true;
break;
} else {
k += 1;
}
}
},
_ => panic!()
}
_ => panic!(),
}
}
}
@ -62,16 +73,39 @@ impl Day for Day14 {
// .join("\n")
// );
new_dish.into_iter().enumerate().map(|(i, line)| line.into_iter().filter_map(|rock| if rock { Some(SIZE - i) } else { None }).sum::<usize>()).sum::<usize>().to_string()
new_dish
.into_iter()
.enumerate()
.map(|(i, line)| {
line.into_iter()
.filter_map(|rock| if rock { Some(SIZE - i) } else { None })
.sum::<usize>()
})
.sum::<usize>()
.to_string()
}
fn part2(&mut self) -> String {
let mut direction = 0u8; // 0 -> North, 1 -> East, 2 -> South, 3 -> West
let mut new_dish: [[char; SIZE]; SIZE] = self.input.lines().map(|line| line.chars().collect_vec().try_into().unwrap()).collect_vec().try_into().unwrap();
let mut cache = CLruCache::<(u8, [[char; SIZE]; SIZE]), [[char; SIZE]; SIZE]>::new(NonZeroUsize::new(100).unwrap());
let mut new_dish: [[char; SIZE]; SIZE] = self
.input
.lines()
.map(|line| line.chars().collect_vec().try_into().unwrap())
.collect_vec()
.try_into()
.unwrap();
let mut cache = CLruCache::<(u8, [[char; SIZE]; SIZE]), [[char; SIZE]; SIZE]>::new(
NonZeroUsize::new(100).unwrap(),
);
for i in 0..390625u128 {
if i % 100000 == 0 { println!("{:.02}%, {}", i as f64 / 4000000000f64 * 100f64, cache.len()); }
if i % 100000 == 0 {
println!(
"{:.02}%, {}",
i as f64 / 4000000000f64 * 100f64,
cache.len()
);
}
// Cache check
let cache_ref = new_dish.clone();
@ -90,29 +124,36 @@ impl Day for Day14 {
row.reverse();
}
new_dish.reverse();
},
}
3 => Self::rotate(false, &mut new_dish),
_ => panic!()
_ => panic!(),
}
// Init tracking
let mut square_rocks = HashMap::<usize /* column index */, usize /* row index */>::new();
let mut square_rocks =
HashMap::<usize /* column index */, usize /* row index */>::new();
let clone = new_dish.clone();
for (i, row) in clone.iter().enumerate() {
for (j, char) in row.iter().enumerate() {
match char {
'.' => continue,
'#' => { square_rocks.insert(j, i); },
'#' => {
square_rocks.insert(j, i);
}
'O' => {
new_dish[i][j] = '.';
let mut k = square_rocks.get(&j).map(|n| n + 1).unwrap_or(0);
loop {
if new_dish[k][j] != 'O' { new_dish[k][j] = 'O'; break }
else { k += 1; }
if new_dish[k][j] != 'O' {
new_dish[k][j] = 'O';
break;
} else {
k += 1;
}
}
},
_ => panic!()
}
_ => panic!(),
}
}
}
@ -127,19 +168,32 @@ impl Day for Day14 {
row.reverse();
}
new_dish.reverse();
},
}
3 => Self::rotate(true, &mut new_dish),
_ => panic!()
_ => panic!(),
}
// Loop direction
if direction != 0 { direction -= 1; } else { direction = 3; }
if direction != 0 {
direction -= 1;
} else {
direction = 3;
}
}
// Cache store
cache.put((direction, cache_ref), new_dish);
}
new_dish.into_iter().enumerate().map(|(i, line)| line.into_iter().filter_map(|rock| if rock == 'O' { Some(SIZE - i) } else { None }).sum::<usize>()).sum::<usize>().to_string()
new_dish
.into_iter()
.enumerate()
.map(|(i, line)| {
line.into_iter()
.filter_map(|rock| if rock == 'O' { Some(SIZE - i) } else { None })
.sum::<usize>()
})
.sum::<usize>()
.to_string()
}
}

76
lib/src/day15/mod.rs Normal file
View file

@ -0,0 +1,76 @@
use std::collections::HashMap;
use crate::utils::Day;
#[derive(Debug, Default)]
pub struct Day15 {
pub input: String,
}
impl Day for Day15 {
fn part1(&mut self) -> String {
let mut current = 0usize;
self.input
.split(',')
.map(|text| {
current = 0;
for c in text.chars() {
current += c as usize;
current *= 17;
current %= 256;
}
current
})
.sum::<usize>()
.to_string()
}
fn part2(&mut self) -> String {
let mut map =
HashMap::<usize, Vec<(&str, u8)>>::from_iter((0..=255usize).map(|i| (i, vec![])));
for operation in self.input.split(',') {
let (label, focal_length) = operation.split_once(['-', '=']).unwrap();
let box_id = {
let mut current = 0;
for c in label.chars() {
current += c as usize;
current *= 17;
current %= 256;
}
current
};
if focal_length == "" {
let lenses = map.get_mut(&box_id).unwrap();
if let Some(position) = lenses.iter().position(|(l, _)| l == &label) {
lenses.remove(position);
}
} else {
let focal_length = focal_length.parse::<u8>().unwrap();
let lenses = map.get_mut(&box_id).unwrap();
match lenses.iter().position(|(l, _)| l == &label) {
Some(position) => lenses[position].1 = focal_length,
None => lenses.push((label, focal_length)),
}
}
}
(0..=255usize)
.map(|i| {
map.remove(&i)
.unwrap()
.into_iter()
.enumerate()
.map(|(j, (_, focal_length))| focal_length as usize * (j + 1) * (i + 1))
.sum::<usize>()
})
.sum::<usize>()
.to_string()
}
}

3
lib/src/lib.rs
View file

@ -7,6 +7,7 @@ use day11::Day11;
use day12::Day12;
use day13::Day13;
use day14::Day14;
use day15::Day15;
use day2::Day2;
use day3::Day3;
use day4::Day4;
@ -26,6 +27,7 @@ pub mod day11;
pub mod day12;
pub mod day13;
pub mod day14;
pub mod day15;
pub mod day2;
pub mod day3;
pub mod day4;
@ -71,6 +73,7 @@ pub fn get_day(day: u8, input: String) -> Box<dyn Day> {
}),
13 => Box::new(Day13 { input }),
14 => Box::new(Day14 { input }),
15 => Box::new(Day15 { input }),
_ => panic!("Invalid day #"),
}
}

5
solution.txt Normal file
View file

@ -0,0 +1,5 @@
C\_.{⟨Ctrl+R⟩=len('⟨Ctrl+R⟩-')⟨Enter⟩}⟨Esc⟩yiWu
:%s/\v\.(⟨Ctrl+R⟩0)O/O\1./g⟨Enter⟩qaqqag&gg:redr|sl25m⟨Enter⟩@aq@a
⟨Ctrl+V⟩GI+0 *(0⟨Esc⟩gvlg⟨Ctrl+A⟩GyiWugvpjVGg⟨Ctrl+X⟩
:%s/O/+1/g|%s/[.#]//g|%s/$/)⟨Enter⟩
VggJ0C⟨Ctrl+R⟩=⟨Ctrl+R⟩-⟨Enter⟩⟨Esc⟩