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Rust Day 3

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This commit is contained in:
Tobias Berger 2023-04-27 12:51:03 +02:00
parent 4a0a756323
commit 526806b224
Signed by: toby
GPG key ID: 2D05EFAB764D6A88
9 changed files with 451 additions and 4 deletions
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3
rust/.vscode/settings.json vendored Normal file
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@ -0,0 +1,3 @@
{
"rust-analyzer.showUnlinkedFileNotification": false
}

2
rust/Cargo.lock generated
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@ -4,4 +4,4 @@ version = 3
[[package]]
name = "advent-of-code"
version = "20.1.2"
version = "20.3.2"

6
rust/Cargo.toml
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@ -1,6 +1,6 @@
[package]
name = "advent-of-code"
version = "20.1.2"
version = "20.3.2"
edition = "2021"
resolver = "2"
@ -30,3 +30,7 @@ path = "src/day01/main.rs"
[[bin]]
name = "day02"
path = "src/day02/main.rs"
[[bin]]
name = "day03"
path = "src/day03/main.rs"

4
rust/src/day02/main.rs
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@ -21,7 +21,7 @@ impl FromStr for Password {
type Err = ParseError;
fn from_str(line: &str) -> Result<Self, Self::Err> {
let parts = line.split(" ").collect::<Vec<_>>();
let parts = line.split(' ').collect::<Vec<_>>();
if parts.len() != 3 {
return Err(ParseError(line.into()));
@ -30,7 +30,7 @@ impl FromStr for Password {
let first_num = nums_iter.next().unwrap();
let second_num = nums_iter.next().unwrap();
let letter = parts[1].chars().nth(0).unwrap();
let letter = parts[1].chars().next().unwrap();
let password = parts[2].into();
Ok(Password {

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rust/src/day03/input.txt Normal file
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45
rust/src/day03/main.rs Normal file
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@ -0,0 +1,45 @@
const INPUT: &str = include_str!("input.txt");
mod part_1;
use part_1::part_1;
mod part_2;
use part_2::part_2;
pub struct ParsedInput {
pub field: Vec<Vec<Spot>>,
pub width: usize,
pub height: usize,
}
pub enum Spot {
Empty,
Tree,
}
impl From<&u8> for Spot {
fn from(value: &u8) -> Self {
match value {
b'.' => Self::Empty,
b'#' => Self::Tree,
_ => unreachable!(),
}
}
}
pub fn parse_input(input: &'static str) -> ParsedInput {
let field = input
.lines()
.map(|line| line.as_bytes().iter().map(Spot::from).collect())
.collect::<Vec<Vec<_>>>();
let height = field.len();
let width = field[0].len();
ParsedInput {
field,
width,
height,
}
}
pub fn main() {
let input = parse_input(INPUT);
part_1(&input);
part_2(&input);
}

27
rust/src/day03/part_1.rs Normal file
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@ -0,0 +1,27 @@
use crate::{ParsedInput, Spot};
pub(crate) fn part_1(input: &ParsedInput) -> u64 {
let mut result = 0;
for y in 0..input.height {
let x = (y * 3) % input.width;
if matches!(input.field[y][x], Spot::Tree) {
result += 1;
}
}
result
}
#[cfg(test)]
mod tests {
const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
#[test]
fn test_with_sample_solution() {
assert_eq!(super::part_1(&crate::parse_input(SAMPLE_INPUT)), 7);
}
#[test]
fn test_with_solution() {
assert_eq!(super::part_1(&crate::parse_input(crate::INPUT)), 187);
}
}

34
rust/src/day03/part_2.rs Normal file
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@ -0,0 +1,34 @@
use crate::{ParsedInput, Spot};
pub(crate) fn part_2(input: &ParsedInput) -> u64 {
let mut result = 1;
for (dx, dy) in [(1, 1), (3, 1), (5, 1), (7, 1), (1, 2)] {
let mut count = 0;
let mut x = 0;
let mut y = 0;
while y < input.height {
if matches!(input.field[y][x], Spot::Tree) {
count += 1;
}
x = (x + dx) % input.width;
y += dy;
}
result *= count;
}
result
}
#[cfg(test)]
mod tests {
const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
#[test]
fn test_with_sample_solution() {
assert_eq!(super::part_2(&crate::parse_input(SAMPLE_INPUT)), 336);
}
#[test]
fn test_with_solution() {
assert_eq!(super::part_2(&crate::parse_input(crate::INPUT)), 4723283400);
}
}

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rust/src/day03/sample_input.txt Normal file
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..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#