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Candygoblen123 2023-12-05 13:31:43 -05:00
parent 08478800e3
commit 993b5e8e3b
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4 changed files with 342 additions and 12 deletions

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day3/Cargo.lock generated
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@ -2,6 +2,15 @@
# It is not intended for manual editing. # It is not intended for manual editing.
version = 3 version = 3
[[package]]
name = "array2d"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "79093d31d0a9c7832c71ad74dd945b7861f721e6f242aa67be253a5eecbac937"
[[package]] [[package]]
name = "day3" name = "day3"
version = "0.1.0" version = "0.1.0"
dependencies = [
"array2d",
]

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@ -6,3 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
array2d = "0.3.0"

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fn main() { use std::collections::HashMap;
println!("Hello, world!"); use std::fs;
use array2d::Array2D;
pub fn main() {
let input = fs::read_to_string("input.txt").unwrap();
let array_2d = get_map(&input);
// let mut r = Vec::new();
let mut stars_count: HashMap<(usize, usize), Vec<u32>> = HashMap::new();
for (y, row_iter) in array_2d.rows_iter().enumerate() {
let mut checked = false;
for (x, element) in row_iter.enumerate() {
let d: char = element.clone();
if d.is_digit(10) && !checked {
let star_vec = get_neighboring_star(x, y, &array_2d);
if !star_vec.is_empty() {
let (x_star, y_star, _) = star_vec.first().unwrap().clone();
let key = (x_star, y_star);
let gear = get_number(x, y, &array_2d);
if stars_count.contains_key(&key) {
let mut v: Vec<u32> = stars_count.get(&(x_star, y_star)).unwrap().clone();
v.push(gear);
stars_count.insert(key, v);
} else {
stars_count.insert(key, vec![gear]);
}
checked = true
}
} else if !d.is_digit(10) {
checked = false;
}
}
}
let r = stars_count.iter().fold(0u32, |acc, (_, gears)| {
if gears.len() == 2 {
acc + gears.first().unwrap() * gears.last().unwrap()
} else {
acc
}
});
println!("{}", r);
}
// pub fn main() {
// let input = fs::read_to_string("input.txt").unwrap();
// let array_2d = get_map(&input);
// let mut r = 0;
// for (y, row_iter) in array_2d.rows_iter().enumerate() {
// let mut checked = false;
// for (x, element) in row_iter.enumerate() {
// let d: char = element.clone();
// if d.is_digit(10) && !checked {
// if !get_neighbors(x, y, &array_2d).is_empty() {
// checked = true;
// r += get_number(x, y, &array_2d)
// }
// } else if !d.is_digit(10) {
// checked = false;
// }
// }
// }
// println!("{}", r);
// }
fn get_map(input: &str) -> Array2D<char> {
let rows: Vec<&str> = input.split("\n").collect();
let mut array = Vec::new();
for row in rows {
let row_vec: Vec<char> = row.chars().collect();
array.push(row_vec);
}
Array2D::from_rows(&array).unwrap()
}
fn get_number(x: usize, y: usize, array2d: &Array2D<char>) -> u32 {
// We're dealing with only 3 digits numbers
let mut i = x.clone();
let mut j = x.clone() - 1;
let mut next_neighbors = Vec::new();
let mut prev_neighbors = Vec::new();
while array2d.get(y, i).is_some() && array2d.get(y, i).unwrap().is_digit(10) {
next_neighbors.push(array2d.get(y, i).unwrap());
i += 1
}
while array2d.get(y, j).is_some() && array2d.get(y, j).unwrap().is_digit(10) {
prev_neighbors.push(array2d.get(y, j).unwrap());
if j > 0 {
j -= 1
} else {
break;
}
}
let mut prev: Vec<&char> = prev_neighbors.clone().into_iter().rev().collect();
prev.append(&mut next_neighbors);
prev
.into_iter()
.fold(String::new(), |a, b| a + &b.to_string())
.parse()
.unwrap()
}
fn get_neighbors(x: usize, y: usize, array2d: &Array2D<char>) -> Vec<&char> {
let mut neighbors = Vec::new();
neighbors.push(array2d.get(y, x.checked_add(1).unwrap()));
if x > 0 {
neighbors.push(array2d.get(y, x.checked_sub(1).unwrap()));
neighbors.push(array2d.get(y.checked_add(1).unwrap(), x.checked_sub(1).unwrap()));
}
if y > 0 {
neighbors.push(array2d.get(y.checked_sub(1).unwrap(), x));
neighbors.push(array2d.get(y.checked_sub(1).unwrap(), x.checked_add(1).unwrap()));
}
if x > 0 && y > 0 {
neighbors.push(array2d.get(y.checked_sub(1).unwrap(), x.checked_sub(1).unwrap()));
}
neighbors.push(array2d.get(y.checked_add(1).unwrap(), x));
neighbors.push(array2d.get(y.checked_add(1).unwrap(), x.checked_add(1).unwrap()));
neighbors
.into_iter()
.flatten()
.filter(|c| !c.is_digit(10) && **c != '.')
.collect()
}
fn get_neighboring_star(x: usize, y: usize, array2d: &Array2D<char>) -> Vec<(usize, usize, Option<&char>)> {
let mut neighbors: Vec<(usize, usize, Option<&char>)> = Vec::new();
neighbors.push((x.checked_add(1).unwrap(), y, array2d.get(y, x.checked_add(1).unwrap())));
if x > 0 {
neighbors.push((x.checked_sub(1).unwrap(), y, array2d.get(y, x.checked_sub(1).unwrap())));
neighbors.push((x.checked_sub(1).unwrap(), y.checked_add(1).unwrap(), array2d.get(y.checked_add(1).unwrap(), x.checked_sub(1).unwrap())));
}
if y > 0 {
neighbors.push((x, y.checked_sub(1).unwrap(), array2d.get(y.checked_sub(1).unwrap(), x)));
neighbors.push((x.checked_add(1).unwrap(), y.checked_sub(1).unwrap(), array2d.get(y.checked_sub(1).unwrap(), x.checked_add(1).unwrap())));
}
if x > 0 && y > 0 {
neighbors.push((x.checked_sub(1).unwrap(), y.checked_sub(1).unwrap(), array2d.get(y.checked_sub(1).unwrap(), x.checked_sub(1).unwrap())));
}
neighbors.push((x, y.checked_add(1).unwrap(), array2d.get(y.checked_add(1).unwrap(), x)));
neighbors.push((x.checked_add(1).unwrap(), y.checked_add(1).unwrap(), array2d.get(y.checked_add(1).unwrap(), x.checked_add(1).unwrap())));
neighbors
.into_iter()
.filter(|(_, _, c)| c.is_some() && c.unwrap() == &'*')
.collect::<Vec<(usize, usize, Option<&char>)>>()
}
pub fn part_two(input: &str) -> Option<u32> {
let array_2d = get_map(input);
// let mut r = Vec::new();
let mut stars_count: HashMap<(usize, usize), Vec<u32>> = HashMap::new();
for (y, row_iter) in array_2d.rows_iter().enumerate() {
let mut checked = false;
for (x, element) in row_iter.enumerate() {
let d: char = element.clone();
if d.is_digit(10) && !checked {
let star_vec = get_neighboring_star(x, y, &array_2d);
if !star_vec.is_empty() {
let (x_star, y_star, _) = star_vec.first().unwrap().clone();
let key = (x_star, y_star);
let gear = get_number(x, y, &array_2d);
if stars_count.contains_key(&key) {
let mut v: Vec<u32> = stars_count.get(&(x_star, y_star)).unwrap().clone();
v.push(gear);
stars_count.insert(key, v);
} else {
stars_count.insert(key, vec![gear]);
}
checked = true
}
} else if !d.is_digit(10) {
checked = false;
}
}
}
let r = stars_count.iter().fold(0u32, |acc, (_, gears)| {
if gears.len() == 2 {
acc + gears.first().unwrap() * gears.last().unwrap()
} else {
acc
}
});
Some(r)
} }